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300-420 Designing Cisco Enterprise Networks (ENSLD) Questions and Answers

Questions 4

At which layer does Cisco Express Forwarding use adjacency tables to populate addressing information?

Options:

A.

    Layer4

B.

    Layer 2

C.

    Layer 1

D.

    Layer 3

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Questions 5

Refer to the exhibit. A customer needs to apply QoS to the network management traffic passing through the GigabitEthernet0/2 interface. All eight queuing classes are in use, so the new requirement must be integrated into the existing policy. Which solution must the customer choose?

Options:

A.

Mark traffic to DSCP CS5 and assign it to the SIGNALLING class. Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the SIGNALLING class.

B.

Mark the traffic to DSCP CS4 and assign it to the SIGNALLING class. Then, prioritize traffic within the class.

C.

Mark the traffic to DSCP CS6 and assign it to the ROUTING class Then, prioritize traffic within the class.

D.

Mark the traffic to DSCP CS2 and assign it to the ROUTING class Then, baseline existing queue sizes to determine if additional bandwidth can be provisioned to the ROUTING class

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Questions 6

A router running ISIS is showing high CPU and bandwidth utilization. An engineer discovers that the router is configured as L1/L2 and has L1 and L2 neighbors. Which step optimizes the design to address the issue?

Options:

A.

Make this router a DIS for each of the interfaces

B.

Disable the default behavior of advertising the default route on the L1/L2 router

C.

Configure the router to be either L1 or L2

D.

Configure each interface as either L1 or L2 circuit type

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Questions 7

Refer to the exhibit.

A network engineer must design a multicast solution based on:

* Many-to-many communications between the users and sources

* Support of up to 50 multicast sources

* Users that must register for steams

Which multicast solution must the engineer select?

Options:

A.

Any Source Multicast

B.

Bidirectional PIM

C.

Source-Specific Multicast

D.

Multicast VPN

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Questions 8

Refer to the exhibit. An architect must ensure a convergence time of 200 ms or less during a link failure within area 0. In addition, the solution must not impact the overall performance of the network. Which solution must the architect select?

Options:

A.

UDLD

B.

BFD

C.

fast hellos

D.

carrier delay

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Questions 9

What are two valid scaling techniques when an EIGRP network is designed that consists of more than 1000 routers? (Choose two.)

Options:

A.

Use structured hierarchical topology with route summarization

B.

Used sub-second timers

C.

Use the distribute-list command to filter routes

D.

Modify delay parameters on the links

E.

Implement multiple EIGRP autonomous systems

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Questions 10

Refer to the exhibit.

An engineer is designing a routing solution for a customer. The design must ensure that a failure of network

10.1.0.0/24, 10.1.2.0/24, 10.2.1.0/24, or 10.2.3.0/24 does not impact the core. It also requires fast convergence

time during any link failover in the core or access networks. Which solution must the engineer select?

Options:

A.

Add aggregation layer between core and access networks.

B.

Enable graceful restart on routers A and C.

C.

Enable FRR for the connected networks of routers A and C.

D.

Enable summarization on routers A and C.

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Questions 11

Which AES mode should be used in a Cisco SD-WAN environment that includes multicast applications?

Options:

A.

Cipher Feedback (CFB)

B.

Cipher Block Chaining (CBC)

C.

Galois/Counter Mode (GCM)

D.

Electronic Code Book (ECB)

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Questions 12

An enterprise needs to enhance its WAN availability after a recent outage with its only MPLS provider. The proposed solution must have a quick deployment, be affordable, be reliable, and work as a backup for the enterprise's primary MPLS connection. Which solution meets these requirements?

Options:

A.

Contract an internet connection and deploy DMVPN.

B.

Deploy BFD echo mode and probe provider PE

C.

Deploy an additional WAN router and use a floating static route

D.

Contract another MPLS provider and deploy GET VPN.

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Questions 13

What is the role of a control-plane node in a Cisco SD-Access architecture?

Options:

A.

fabric device that connects wired endpoints to the SD-Access fabric

B.

map system that manages endpoint to device relationships

C.

fabric device that connects APs and wireless endpoints to the SD-Access fabric

D.

map system that manages External Layer 3 networks

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Questions 14

Refer to the exhibit. Which two points in the network must an engineer configure the ports for explicit trust when using a DiffServ model?

Options:

A.

B and E

B.

F and G

C.

A and D

D.

C and D

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Questions 15

An architect is designing a network for an enterprise site. The design must use an active/backup design for the WAN. It must guarantee the SLA for several applications regardless of which connection is used. Which deployment model should the architect choose?

Options:

A.

MPLS WAN from two separate ISPs

B.

hybrid WAN using MPLS VPN and internet VPN from a single ISP

C.

hybrid WAN using MPLS VPN and internet VPN from two separate ISPs

D.

internet WAN from two separate ISPs

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Questions 16

An infrastructure team is concerned about the shared memory utilization of a device, and for this reason, they need to monitor the device state. Which solution limits impact on the device and provides the required data?

Options:

A.

IPFIX

B.

static telemetry

C.

on-change subscription

D.

periodic subscription

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Questions 17

A network engineer must design an MSDP multicast solution to provide RP resilience in a network with two separate domains. Also, multicast sources and receivers must register with the local RP. Which solution must the engineer choose?

Options:

A.

Configure the RP has value to 0, and traffic will route to the closest RP

B.

Configure the RP loopback interface with the same IP address/32, and traffic will route to the closest RP

C.

Configure the RP group ranges to split the multicast traffic, and traffic will route to the longest match

D.

Configure the RP priority with the same value, and traffic will route to the closest RP

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Questions 18

Exhibit:

Options:

A.

Make R3 an L1L2 router.

B.

Make R31 an L1 router.

C.

Make Area 0 L2-only.

D.

Make R11 an L2 router.

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Questions 19

A network architect Is enabling TV services In the LAN. The source will be streaming to the 239.1.1.1 group IP address. Dense mode Is not allowed In the network. Multicast has already been enabled on all network devices In the LAN segment. Which action must the architect take to finalize the design?

Options:

A.

Enable PIM SSM.

B.

Enable PIM Auto-RP.

C.

Enable PIM Anycast RP

D.

Enable PIM BSR.

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Questions 20

Which routes does the overlay management protocol advertise in an SD-WAN overlay?

Options:

A.

underlay, MPLS, and overlay

B.

primary, backup, and load-balanced

C.

prefix, TLOC, and service

D.

Internet, MPLS, and backup

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Questions 21

An engineer is designing an EIGRP network for a small branch site where there is only one Layer 3 router. The engineer wants the router to advertise the local LAN network to remote EIGRP neighbors without sending any unnecessary multicast messages on the local LAN. Which action should the engineer take?

Options:

A.

Use a static default route for this site instead of EIGRP

B.

Advertise the local LAN using the network command and the passive-interface feature

C.

Redistribute the local LAN network using the redistribute connected command

D.

Advertise the local LAN subnet as a stub network

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Questions 22

What is the purpose of a Cisco SD-Access underlay network?

Options:

A.

to abstract IP-based connectivity from physical connectivity

B.

to emulate LAN segments to transport Layer 2 frames over a Layer 3 network

C.

to establish physical connectivity between switches and routers

D.

to provide virtualization by encapsulating network traffic over IP tunnels

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Questions 23

A network engineer must segregate three interconnected campus networks using IS-IS routing. A two-layer hierarchy must be used to support large routing domains and to avoid more specific routes from each campus network being advertised to other campus network routers automatically. Which two actions does the engineer take to accomplish this segregation? (Choose two.)

Options:

A.

Designate two IS-IS routers as BDR routers at the edge of each campus, and configure one BDR for all Level 1 routers and one BDR for all Level 2 routers.

B.

Designate two IS-IS routers from each campus to act as Level 1/Level 2 backbone routers at the edge of each campus network.

C.

Assign the same IS-IS NET value for each campus, and configure internal campus routers with Level 1/ Level 2 routing.

D.

Utilize different MTU values for each campus network segment. Level 2 backbone routers must utilize a larger MTU size of 9216.

E.

Assign a unique IS-IS NET value for each campus, and configure internal campus routers with Level 1 routing.

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Questions 24

An engineer must design a multicast network for a financial application. Most of the multicast sources also receive multicast traffic (many-to-many deployment model). To better scale routing tables, the design must not use source trees. Which multicast protocol satisfies these requirements?

Options:

A.

PIM-SSM

B.

PIM-SM

C.

MSDP

D.

BIDIR-PIM

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Questions 25

An engineer must use YANG with an XML representation to configure a Cisco IOS XE switch with these specifications:

    IP address 10.10.10.10/27 configured on the interface GigabitEthernet2/1/0

    connectivity from a directly connected host 10.10.10.1/27

Which YANG data model set must the engineer choose?

A)

B)

C)

D)

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Questions 26

Which integration capability does gRPC provide?

Options:

A.

leveraging the LDAP protocol for authentication and directory services ensuring secure access control in RPC communications

B.

leveraging the XMPP protocol for real-time messaging and collaboration between client and server applications

C.

leveraging protocol buffers to provide efficient serialization and deserialization of structured data over the network

D.

leveraging GRAPH-API for network monitoring and management providing comprehensive visibility into RPC-related metrics and performance statistics

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Questions 27

Drag and drop the elements from the left onto the YANG models where they and used on the right.

Options:

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Questions 28

Which two best practices must be followed when designing an out-of-band management network? (Choose two.)

Options:

A.

    Enforce access control

B.

    Facilitate network integration

C.

    Back up data using the management network

D.

    Ensure that the management network is a backup to the data network

E.

    Ensure network isolation

Questions 29

Drag and drop the types of WAN connectivity from the left onto the connectivity use cases on the right.

Options:

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Questions 30

Refer to the exhibit. An engineer must design an automatic failover solution. The solution should allow HSRP to detect a WAN 1 failure and initiate an automatic failover, making router R2 the active HSRP router. Which two solutions should the engineer choose? (Choose two.)

Options:

A.

Implement Enhanced Object Tracking on router R1

B.

use a floating static route

C.

Implement IP SLA on router R1

D.

Implement PBR on router R1

E.

use IP source routing

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Questions 31

Which function do reverse path forwarding mechanisms perform in a multicast deployment?

Options:

A.

They notify the upstream router of multicast traffic.

B.

They send PIM prune message toward multicast sources.

C.

They eliminate overlapping multicast addresses

D.

They prevent loops and duplicate packets.

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Questions 32

Refer to the exhibit.

An architect is designing an EIGRP solution based on these requirements:

* Traffic forwarding should use the best two paths while all links are available

* Single path failure must not impact traffic between branch and HQ

Which solution must the architect select?

Options:

A.

Maximum-paths 2

B.

Add-paths 2

C.

Metric weights 010100

D.

Variance 2

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Questions 33

Refer to the exhibit.

An architect is designing a network for a customer supporting a Wake-on-LAN application. Which solution must the architect choose?

Options:

A.

IP directed-broadcasts on R1

B.

spanning-tree uplinkfast on SW1

C.

spanning-tree uplinkfast on SW2

D.

IP directed-broadcasts on R2

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Questions 34

A company wants to deploy IPv6 within its existing network infrastructure. All current infrastructure equipment supports IPv6, and the company wants a migration strategy that must not require purchasing additional equipment The plan must keep operational management costs low. support IPv6 multicast, and allow applications to migrate using DNS. Which strategy must the company choose?

Options:

A.

hybrid ISATAP tunnel model

B.

hybrid manual tunnel model

C.

service block model

D.

dual-stack model

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Questions 35

Refer to the exhibit. The distribution switches serve as the layer 3 boundary. HSRP preemption is enabled. When the primary switch comes back after a failure, traffic is initially dropped. Which solution must be implemented to improve the design?

Options:

A.

Increase the hello timers on both HSRP devices

B.

Use the preempt delay feature on the primary HSRP device.

C.

Use the preempt delay feature on the backup HSRP device

D.

Configure a higher mac-refresh interval on both HSRP devices

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Questions 36

Refer to the exhibit. An architect must design an OSPF solution for an enterprise customer. The design must meet these requirements:

·Limit the link flap impact to Area-1 and Area-2.

·Any link failure must have minimal impact on voice and video traffic.

·Which two OSPF solutions must the architect include in the design? (Choose two.)

Options:

A.

Reduce the frequency of OR and BOR elections.

B.

increase hello and how timer.

C.

Tune LSA and SPF throttling timers

D.

Enable manual route summarization and configure all nonbackbone areas as stub networks.

E.

Advertise default routes from the backbone to nonbackone areas.

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Questions 37

Which method will filter routes between EIGRP neighbors within the same autonomous system?

Options:

A.

distribute-list

B.

policy-based routing

C.

leak-map

D.

route tagging

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Questions 38

Refer to the exhibit.

An engineer must design a WAN solution so that ISP-1 is always preferred over ISP-2. The path via ISP-2 is

considered as a backup and must be used only when the path to ISP-1 is down. Which

solution must the engineer choose?

Options:

A.

R1:

- Routes advertised to ISP-1: 0x AS-path prepend

- Routes received from ISP-1: HIGH local-preference

- Routes advertised to R2: no action

- Routes received from R2: community NO-EXPORT

R2:

- Routes advertised to ISP-2:5x AS-path prepend

- Routes received from ISP-2: LOW local-preference

- Routes advertised to R1: community NO-ADVERTISE

- Routes received from R1: no action

B.

R1:

- Routes advertised to ISP-1: 0x AS-path prepend

- Routes received from ISP-1: HIGH local-preference

- Routes advertised to R2: community NO-EXPORT

- Routes received from R2: no action

R2:

- Routes advertised to ISP-2: 5x AS-path prepend

- Routes received from ISP-2: LOW local-preference

- Routes advertised to R1: no action

- Routes received from R1: no action

C.

R1:

- Routes advertised to ISP-1: 0x AS-path prepend

- Routes received from ISP-1: LOW local-preference

- Routes advertised to R2: community NO-ADVERTISE

- Routes received from R2: no action

R2:

- Routes advertised to ISP-2: 5x AS-path prepend

- Routes received from ISP-2: HIGH local-preference

- Routes advertised to R1: no action

- Routes received from R1: community NO-ADVERTISE

D.

R1:

- Routes advertised to ISP-1: 5x AS-path prepend

- Routes received from ISP-1: LOW local-preference

- Routes advertised to R2: community NO-ADVERTISE

- Routes received from R2: no action

R2:

- Routes advertised to ISP-2: 0x AS-path prepend

- Routes received from ISP-2: HIGH local-preference

- Routes advertised to R1: community NO-EXPORT

- Routes received from R1: no action

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Questions 39

Which two considerations must be made regarding the overlay network for a Cisco SD-Access architecture? (Choose two.)

Options:

A.

Virtual networks should be used for microsegmentation

B.

SGTs should be used for data plane isolation and microsegmentation

C.

Virtual networks should be used for data plane isolation only

D.

Overlapping IP addresses across different overlay networks should be used to conserve IP addresses

E.

Overlapping IP addresses across different overlay networks should be avoided for operational simplicity

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Questions 40

Refer to the exhibit. A network engineer is designing an OSPF solution to connect a company's remote to a newly provisioned MPLS VPN backbone. Some of the branches have a direct dark fiber connection between each other. The engineer wants to ensure that the dark fibers are used only when the MPLS core is unavailable. Which solution must the engineer choose?

Options:

A.

Stub area

B.

Sham link

C.

Virtual link

D.

NSSA

Questions 41

A company’s branch location uses redundant routers and links for connectivity to the headquarters. Also, to use the entire available bandwidth, the branch uses a dynamic routing protocol. An architect must design a multicast streaming solution to avoid RPF check failures because of the current network design. Which deployment model must the architect choose?

Options:

A.

PIM-SM

B.

BIDIR-PIM

C.

PIM-BSR

D.

PIM-SSM

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Questions 42

Refer to the exhibit. A customer has two eBGP peerings from a single CE router toward two service providers. The customer has hired an architect to design a solution to ensure certain traffic enters the customer's network through interface g¡g0/0. Which solution must the architect include in the design?

Options:

A.

Advertise a lower MED value toward the less preferred service provider.

B.

Prepend additional AS on the AS path toward the preferred service provider.

C.

Break aggregated routes into longer prefixes and advertise to the preferred service provider.

D.

Set a higher local preference to the preferred service provider path.

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Questions 43

How are wireless endpoints registered in the HTDB in a Cisco SD-Access architecture?

Options:

A.

Fabric edge nodes update the HTDB based on CAPPWAP messaging from the AP

B.

Fabric WLCs update the HTDB as new clients connect to the wireless network

C.

Border nodes first register endpoints and then update the HTDB

D.

Fabric APs update the HTDB with the clients' ElD and RLOC

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Questions 44

The customer solution requires QoS to support streaming multimedia over a WAN. An architect chooses to use Per-Hop Behavior. Which solution should the engineer use to of mark traffic traveling between branch sites?

Options:

A.

LLQ with DSCP EF

B.

CBWFQ with DSCP AF3

C.

CBWFQ with DSCP AF2

D.

LLQ with DSCP AF4

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Questions 45

Currently, inter-VRF routing between the global routing table and VRF-A is accomplished on the client firewall, but the customer wants to do this on the core network layer. The customer does not want to run BGP, VRF-Lite: or static routing Which mechanism meets the requirements?

Options:

A.

policy-based routing with the global set statement in a route map

B.

route map that matches access lists and prefix lists with the import feature

C.

inter-VRF can only be used on an external device with a link in each VRF

D.

VRF receive feature under the global routing interfaces

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Questions 46

Refer to the exhibit. A customer experienced an unexpected network outage when the link between R1 and R2 went down. An architect must design a solution to ensure network continuity in the event the link fails again. Which solution should the design include?

Options:

A.

Make R31 an L1 router.

B.

Make R3 an L1L2 router

C.

Make Area 0 L2-only

D.

Make R11 an L2 router.

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Questions 47

Which information update is carried by OMP and enables the Cisco SD-WAN to build a secure overlay fabric on top of any public or private transport without regard for the actual link IP?

Options:

A.

TLOC

B.

RLOC

C.

LISP PITR

D.

DTLS

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Questions 48

Drag and drop the elements from the left onto the functions they perform in the Cisco SD-WAN architecture on the right.

Options:

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Questions 49

Refer to the exhibit. An engineer must connect the IPv6 island to the IPv4-only network to provide IPv6 hosts access to file servers and DNS services in the IPv4 network. Which NAT should the engineer choose?

Options:

A.

stateless NAT66

B.

stateful NAT66

C.

static NAT-PT

D.

dynamic NAT-PT

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Questions 50

In Cisco SD-Access. virtual networks create segmentation that allows for separation of users and resources. How is this type of segmentation described?

Options:

A.

macro

B.

inter-VN

C.

micro

D.

stretctied

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Questions 51

Refer to the exhibit. An architect with an employee ID: 4542:60:170 is designing a campus Layer 2 infrastructure. The design requires a PoE power budget that varies from 30-60 W. In addition, power must be provided continuously to some endpoints and must be supported even during the reloading of edge switches. Which solution must the architect select?

Options:

A.

PoE Plus

B.

Fast PoE

C.

Universal PoE

D.

Perpetual PoE

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Questions 52

What is the main purpose of the Cisco SD-Access underlay design?

Options:

A.

to enable automated network provisioning and configuration

B.

to support advanced firewall and IPS features

C.

to optimize network traffic routing and load-balancing

D.

to provide network segmentation and isolation for security

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Questions 53

When IPsec VPNs are designed, what is a unique requirement if support for IP Multicast is required?

Options:

A.

encapsulation of traffic with GRE or VTI

B.

IPsec forwarding using transport mode

C.

additional bandwidth for headend

D.

IPsec forwarding using tunnel mode

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Questions 54

Refer to the exhibit An engineer is designing an OSPF solution with these requirements:

    NMS server will manage R5 and R6.

    Upon failure of R1. all NMS traffic should be routed through R4.

    Upon failure of the link between R5 and R6. all traffic destined for 10.6.6.6 should be routed through R4

Which solution must the engineer choose?

Options:

A.

Advertise 172.16.1.1 into OSPF process 1 with high cost on R1.

B.

Apply static routes on R2 and R3 with IP SLA tracking toward R5 and R6.

C.

Enable the default-Information originate command with a higher metric on R2 to R1.

D.

Redistribute OSPF process 1 into process 2 on R1 and R4.

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Questions 55

Refer to the exhibit. An architect is designing a BGP solution to connect a remote branch to a service provider. There are several prefixes within the branch that the company does not want to be advertised to the internet. Which solution should the architect use to accomplish this?

Options:

A.

Set the BGP Internet community for all prefixes.

B.

Implement the NOPEER community.

C.

Use the BGP No-Advertise community for the prefixes to exclude.

D.

Attach the No-Export community with the prefixes to exclude

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Questions 56

Refer to the exhibit.

C0FD9 F48C9ACDC725EA850EC2476EE1E

An architect must design a solution that uses the direct link between R1 and R2 for traffic from 10.10.10.0/24

toward network 10.10.20.0/24. Which solution should the architect include in the design?

Options:

A.

Configure the OSPF cost of the link to a value lower than 30.

B.

Lower the Administrative Distance for OSPF area 0.

C.

Place the link into area 2 and install a new link between R1 and R2 in area 0.

D.

Configure the link to provide multiarea adjacency.

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Questions 57

Which two routing protocols allow for unequal cost load balancing? (Choose two.)

Options:

A.

EIGRP

B.

IS-IS

C.

BGP

D.

OSPF

E.

RIPng

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Questions 58

Refer to the exhibit. An architect must design a solution to connect the network behind R3 with the EIGRP network. Which mechanism should be included to avoid routing loops?

Options:

A.

split-horizon

B.

summarization

C.

down bit

D.

route tags

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Questions 59

Drag and drop the descriptions from the left onto the Cisco SD-WAN component they describe on the right.

Options:

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Questions 60

Which feature minimizes TLOC connections and reduces strain on the vSmart controller in an SD-WAN architecture?

Options:

A.

control-direction

B.

affinity

C.

color

D.

control-connections

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Questions 61

An engineer must peer with an ISP for internet connectivity using BGP, initially, the engineer wants to receive only specific prefixes from the ISP and a default route. However, the solution must provide the flexibility to add prefixes in the future at short notice. The ISP has a two-week change process in place. Which route filtering solution must the engineer employ?

Options:

A.

Request a limited internet routing table and a default route from the ISP and configure the BGP max-limit to 1 with an access list that permits only the specific internet prefixes and blocked networks

B.

Request only the required prefixes and default route be advertised from the ISO with whitelisted networks

C.

Request a full internet routing table and a default route from the ISP and configure inbound route filtering with a prefix list that permits the default route and required prefixes

D.

Configure outbound route filtering on the enterprise and ISP so that the enterprise tell the ISP which prefixes are required

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Questions 62

A company wants to switch from static to dynamic routing. The branches use DMVPN back to the hub using two internet connections. One internet connection speed is 10 Mbps, and the other is 100 Mbps. All locations use Cisco routers; however, the branch routers have limited memory and CPU resources. Which routing protocol and design solution must the company choose for optimal traffic forwarding during peak traffic times?

Options:

A.

iBGP with the hub routers set up as route reflectors

B.

OSPF deployed in area 0 with branch routers connected back via virtual links

C.

EIGRP with branch routers as stub routers and variance enabled

D.

ISIS with the hub and spoke routers configured in two different areas

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Questions 63

An engineer must design a management network for a customer's enterprise network. The design must:

    provide the ability to grant and revoke access privileges

    allow only protocols SSH, NTP, FTP, and SNMP

    restrict access to management Interfaces

Which solution must the engineer choose to meet the requirements?

Options:

A.

in-band

B.

enterprise internal private

C.

out-of-band

D.

mGRE

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Questions 64

What is the purpose of an edge node in an SD-Access network fabric?

Options:

A.

Edge nodes identify and authenticate endpoints and register endpoint information with control plane nodes.

B.

Edge nodes track endpoint IDs to location mappings, along with IPv4, IPv6, or MAC addresses.

C.

Edge nodes are the gateway between the fabric domain and network outside of the fabric.

D.

Edge nodes resolve lookup requests from edge and border nodes to locate destination endpoint IDs.

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Questions 65

Which two steps can be taken to improve convergence in an OSPF network? (Choose two.)

Options:

A.

Use Bidirectional Forwarding Detection

B.

Merge all the areas into one backbone area

C.

Tune OSPF parameters

D.

Make all non-backbone areas stub areas

E.

Span the same IP network across multiple areas.

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Questions 66

Drag and drop the Cisco SD-WAN components from the left onto their definitions on the right.

Options:

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Questions 67

An architect must design a topology for a WAN network that satisfies these requirements:

    Devices must be able to make informed decisions.

    Suboptimal paths are allowed only In case of a failure.

    Backup paths must always be available.

Which topology must the architect select?

Options:

A.

partial mesh

B.

hub and spoke

C.

full mesh

D.

Clos

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Questions 68

Which topology within a network underlay eliminates the need for first hop redundancy protocols while

improving fault tolerance, increasing resiliency, and simplifying the network?

Options:

A.

virtualized topology

B.

routed access topology

C.

Layer 2 topology

D.

logical fabric topology

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Questions 69

An architect must design an IPv6 migration solution for a corporation with remote offices to support:

* The customer has IPv4 peering with their service provider.

* IPv6 users need access to IPv4 and IPv6 resources.

* Existing content providers will migrate to IPv6 in the next two years.

* Users will be migrated in a phase-by-phase approach.

Which migration solution must the architect choose?

Options:

A.

NAT46

B.

tunneling

C.

NAT64

D.

dual-stack

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Questions 70

A company must automate a set of complex changes aligned with DR testing in the network. These changes are specific, and the DR playbook will be adjusted in the future. The playbook has diverse routing and switching assets in scope as well as multiple vendor and hardware platforms. A developer will create a thin, web front-end microservice and integrate with an Open daylight controller to push changes to the network. Which YANG model should be used?

Options:

A.

Use a single native vendor YANG model to minimize development time

B.

Use an open YANG model to allow the reuse of code and standardize the implementation across platforms

C.

Use multiple native vendor YANG models to provide code consistency.

D.

Develop an individualized YANG model to minimize development resources and time to market.

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Questions 71

A network engineer must design a multicast solution to prevent the spoofing of multicast streams and ensure efficient bandwidth utilization. The network will be merged with another multicast domain in the future, and the merge must require minimum effort. Which two solutions meet the customer requirements? (Choose two.)

Options:

A.

PIM-SSM

B.

IGMPv3

C.

IGMPv2

D.

PIM-SM

E.

MSDP

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Questions 72

How do IETF. OpenConfig and Cisco nativo YANG models differ when used to configuro the same feature on an infrastructure device?

Options:

A.

OpenConfig models are more comprehensive than IETF.

B.

Cisco native models are less comprehensive than OpenConfig.

C.

Cisco native models are less comprehensive than IETF.

D.

IETF models are more comprehensive than OpenConfig.

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Questions 73

A company is running BGP on a single router, which has two connections to the same ISP. Which BGP

feature ensures traffic is load balanced across the two links to the ISP?

Options:

A.

Multihop

B.

Multipath Load Sharing

C.

Next-Hop Address Tracking

D.

AS-Path Prepending

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Questions 74

A network engineer must optimize a campus OSPF deployment Currently each time a type 1 or type 2 LSA is generated within an area, the OSPF process must recompute the entire SPT Which solution improves the recomputation process?

Options:

A.

iSPF

B.

BFD

C.

SPF

D.

PRC

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Questions 75

Company A recently acquired another company. Users of the newly acquired company must be able to access a server that exists on Company A’s network, both companies use overlapping IP address ranges. Which action conserves IP address space and provides access to the server?

Options:

A.

Use a single IP address to create overload NAT

B.

Use a single IP address to create a static NAT entry

C.

Build one-to-one NAT translation for every user that needs access

D.

Re-IP overlapping address space in the acquired company

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Questions 76

A company uses cloud-based applications for voice and video calls, file sharing, content sharing, and messaging. During business hours, these applications randomly become slow and unresponsive. However, other applications work smoothly with the current applied QoS polices. Which solution must the company choose to resolve the issue?

Options:

A.

Identify the applications with NBAR2 and allocate the required bandwidth accordingly.

B.

Identify the port used by each application and apply a minimum bandwidth guarantee.

C.

Identify the applications and reserve the required bandwidth on the perimeter routers.

D.

Identify the application ports, create groupings, and rate-limit the required bandwidth.

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Questions 77

Refer to the exhibit. A network architect is preparing a network design based on the EIGRR Routers are connected using a cat6a cable type and the inter-router connection speed is limited to 10 Mbps due to distance. During the pilot phase, a DUAL-3-SIA error message is visible. Which action must the engineer take to create a stable design?

Options:

A.

Enable poison reverse on R4.

B.

Configure STUB area on R4.

C.

Create a summary route on R2.

D.

Disable split horizon on R1.

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Questions 78

An engineer is designing a PIM Anycast RP solution between two data centers. The design must ensure that RP1 in DC1 and RP2 in DC2 inform each other about specific sources that have joined locally. Which solution must the engineer choose?

Options:

A.

Provision the RPs on the same IP subnet and extend the subnet at Layer 2 between data centers

B.

Enable MSDP between RPs using separate unique loopback interfaces

C.

Enable MSDP between RPs using the configured Anycast RP address

D.

No action is required because PIM registers from the source will, by default, reach each RP

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Questions 79

An engineer is designing a QoS solution for a campus. The design must guarantee real-time traffic delivery during congestion, minimize the bandwidth consumption for possible virus or worm attacks, and reduce flooding of excessive traffic during times of congestion. Which two solutions must the engineer select? (Choose two.)

Options:

A.

Create a shaping policy to drop excessive traffic and a strict queue for real-time traffic.

B.

Apply queuing on the distribution to core links

C.

Create a policing policy to drop excessive traffic and a strict queue for real-time traffic.

D.

Create a scavenger queue for excessive traffic and a strict queue for real-time traffic

E.

Apply queuing on the access to distribution links.

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Questions 80

When expanding an existing Cisco SD-Access network, in addition to the control plane, which two device roles are needed to create an additional fabric site? (Choose two.)

Options:

A.

leaf

B.

cEdge

C.

WLC

D.

edge

E.

border

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Questions 81

Refer to the exhibit.

An architect must design an IPv6 migration solution for an enterprise customer to support these requirements:

* Clients will transition to the new IPv6 network, which provides NAT64 and IPv6 DNS resolution services, using the same DNS name that points to the IPv4 address.

* The service provider will create a client-facing IPv6 interface with a new IPv6 virtual address that points to the same IPv4 DNS server.

* The service provider will support clients that use global IPv6 addresses and encapsulate IPv4 packets into IPv6 tunnels.

Which two migration solutions must the architect choose? (Choose two.)

Options:

A.

Use dual-stack lite from the MPLS network to the IGR.

B.

Use IPv6 tunneling from the devices to the core MPLS network.

C.

Use dual-stack lite from the devices to the core MPLS network.

D.

Use NAT44/64 from the MPLS network to the IGR.

E.

Use NAT44/64 from the devices to the core MPLS network.

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Questions 82

Which queuing structure is used on SD-WAN Edge routers?

Options:

A.

FIFO

B.

LLQ+WFQ

C.

1P-4Q-2T

D.

Priority

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Questions 83

What is the purpose of the fabric management plane in a Cisco SD-Access architecture?

Options:

A.

create LISP-based EID for the end-to-end solution that is offered by SD-Access

B.

enable EID-to-RLOC mapping that is based on the BGP protocol

C.

create an underlay network that is based on the IS-IS routing protocol

D.

enable automation techniques for device deployments and configurations

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Questions 84

An organization is designing a detailed QoS plan that limits bandwidth to specific rates. Which two parameters are supported be the traffic policing feature? (Choose two.)

Options:

A.

violating

B.

marking

C.

shaping

D.

bursting

E.

conforming

Questions 85

Refer to the exhibit. Currently, the network uses a single-homed solution for connecting to the internet. An engineer must design a more resilient WAN using the internet circuits at each site. The design must provide failover connectivity, support load-sharing of traffic, and QoS. Which solution must the engineer choose?

Options:

A.

Get VPN

B.

DMVPN

C.

SD-WAN

D.

IPsec tunnels

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Questions 86

Which function are fabric intermediate nodes responsible for in an SD-Access Architecture?

Options:

A.

mapping EIDs to RLOCs

B.

encapsulating user traffic in a VXLAN header including the SGT

C.

registering new endpoints in the HTDB

D.

transporting IP packets between edge nodes and border nodes

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Questions 87

Drag and drop the characteristics from the left onto the YANG modules they describe on the right. Not all options are used.

Options:

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Questions 88

Refer to the exhibit. An engineer Is designing a multicampus Layer 3 Infrastructure using EIGRP as the routing protocol. The design must provide quick replies to queries In the event of a downlink, prevent unnecessary queries, and ensure that traffic does not unnecessarily transit the access layer. Which two actions must the engineer take for the network design? (Choose two.)

Options:

A.

Configure core layer switches as stub routers.

B.

Configure distribution layer switches to summarize routes to the core layer.

C.

Configure access layer switches as stub routers.

D.

Configure access layer and core layer switches as stub routers.

E.

Configure access layer switches to summarize routes to the distribution layer.

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Questions 89

When differentiating between IETF. OpenConfig. and Cisco native YANG models, how does the use of containers differ?

Options:

A.

OpenConfig uses one container for operational data and another container for configuration data, and IETF and Cisco native models use a single container for operational data and configuration data.

B.

IETF and Cisco native models use a single container for operational data and configuration data, and OpenConfig uses one container for operational data and another container for configuration data.

C.

IETF and Cisco native models use one container for operational data and another container for configuration data, and OpenConfig uses a single container for operational data and configuration data.

D.

Cisco native models use one container for operational data and another container for configuration data, and OpenConfig and IETF use a single container for operational data and configuration data.

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Questions 90

Exhibit:

Refer to the exhibit. An engineer is designing a Layer 2 campus network. The design must support fast convergence and leverage as much bandwidth as possible between layers. Distribution switches do support VSS; unfortunately, not all routing protocols are available for use due to license limitations. Which solution must the engineer choose?

Options:

A.

EtherChannel

B.

MEC

C.

RSTP

D.

ECMP

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Questions 91

A company requested that an architect propose a new IPv4 and IPv6 deployment strategy. The company wants a solution that is straightforward, with no information hiding or forwarding overhead. Which solution meets these requirements?

Options:

A.

LISP

B.

NAT64

C.

dual-stack

D.

GRE tunnels

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Questions 92

Drag and drop the model driven telemetry characteristics from the left onto the mode they belong to on the right.

Options:

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Questions 93

Which two statements about VRRP object tracking are true? (Choose two)

Options:

A.

The priority of a VRRP device can change in accordance with the up or down status of a VRRP object

B.

The VRRP interface priority must be manually configured by the administrator

C.

A VRRP group can track only one object at a time

D.

VRRP can track the status of interfaces and routes

E.

VRRP supports only interface tracking

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Questions 94

An architect must design a QoS model for a business-critical application that Is delay-sensitive and requires high bandwidth. The company's head office hosts the application, and DMVPN tunnels protected with IPsec provide connectivity between the head office and branches. Which solution must the architect choose?

Options:

A.

RSVP

B.

IntServ

C.

WRED

D.

DiffServ

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Questions 95

An engineer is designing an IPv4 addressing plan for an enterprise with 1000 branches. Each branch requires a prefix for data and a prefix for voice. Each prefix must accommodate up to 128 hosts, and prefixes must facilitate summarization at aggregation points in the network. The security team requires a simple method for identifying voce prefixes. Which allocation does the engineer recommend from the RFC1918 address space?

Options:

A.

/24 prefixes for data from 10.0.0.0/15 and /24 prefixes for voice from 172.16.0.0/15

B.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from the next contiguous /24 prefix per site

C.

/25 prefixes for data from 10.0.0.0/8 end /25 prefixes for voice from the next contiguous /25 prefix per branch

D.

/24 prefixes for data from 10.0.0.0/8 and /24 prefixes for voice from 172.16.0.0/12

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Questions 96

What are two advantages of the Cisco SD-WAN technology9 (Choose two)

Options:

A.

Improved application experience

B.

Easier deployment

C.

Optimized cloud connectivity

D.

Proactive network management

E.

Consistent connectivity

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Questions 97

Drag and drop the components in a Cisco SD-Access architecture from the left onto their descriptions on the right.

Options:

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Questions 98

An architect is designing a connectivity solution for a customer's two small branch offices. The customer wants a cost-effective design, no routing overload, and some down time during the year is acceptable. Which connectivity solution must the architect choose?

Options:

A.

dual multihomed

B.

single-homed

C.

single multihomed

D.

dual-homed

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Questions 99

Refer to the exhibit. The full EIGRP routing table is advertised throughout the network. Currently, users experience data loss when any one link in the network fails. An architect optimizes the network to reduce the impact when a link fails. Which solution should the architect include in the design?

Options:

A.

Run BFD on the inter links between EIGRP neighbors.

B.

Summarize the access layer networks from each access layer switch toward the aggregation layer.

C.

Reduce the default EIGRP hello interval and hold time.

D.

Summarize the access layer networks from the aggregation layer toward the core layer.

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Questions 100

A network engineer must connect two sites across a public network using a secure tunneling technology that

supports multicast traffic. Which technology must be chosen?

Options:

A.

IPsec

B.

GRE

C.

PPTP

D.

GRE over IPsec

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Questions 101

Refer to the exhibit. An architect is designing an IPv4 plan using the 172.16.0.0/16. The design must maximize the number of subnets while meeting these requirements:

    500 hosts within the server room

    100 hosts at the remote site

    25 hosts at the access site

Which plan must the architect choose?

A)

B)

C)

D)

Options:

A.

Option A

B.

Option B

C.

Option C

D.

Option D

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Exam Code: 300-420
Exam Name: Designing Cisco Enterprise Networks (ENSLD)
Last Update: Mar 29, 2025
Questions: 339

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