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CWNA-107 Certified Wireless Network Administrator Questions and Answers

Questions 4

Your consulting firm has recently been hired to complete a site survey for a company. Your engineers use predictive design software for the task, but the company insists on a pre-deployment site visit.

What task should be performed as part of the pre-deployment visit to prepare for a predictive design?

Options:

A.

Evaluate the building materials at ABC’s facility and confirm that the floor plan documents are consistent with the actual building

B.

Install at least one AP on each side of the exterior walls to test for co-channel interference through these walls

C.

Test several antenna types connected to the intended Aps for use in the eventual deployment

D.

Collect information about the company’s security requirements and the current configuration of their RADIUS and user database servers

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Questions 5

Three access points are used within a facility. One access point is on channel 11 and the other two are on channel 1. The two access points using channel 1 are on either side of the access point using channel 11 and sufficiently apart so that they do not interfere each other when they transmit frames. Assuming no other Aps are in the vicinity, is CCI still a possibility in this network and why?

Options:

A.

Yes, because the client devices connected to one of the channel 1 APs will transmit frames that reach the other channel 1 AP as well as

B.

No, because the Aps are far enough apart that no CCI will occur

C.

No, because CCI only occurs in the 5 GHz frequency band

D.

Yes, because channel 11 loops around and causes CCI with channel 1

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Questions 6

ABC Company is planning a point-to-multipoint bridge deployment with standalone (autonomous) 802.11 bridge units. 802.1X/EAP will be used for bridge authentication. A Linux-based RADIUS server will be used for authentication. What device in the bridge implementation acts as the 802.11X Authenticator?

Options:

A.

All non-root bridges

B.

The root bridge

C.

The Ethernet switch

D.

The RADIUS server

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Questions 7

When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

Options:

A.

VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.

B.

VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.

C.

VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.

D.

Legacy Power Save mode was removed in the 802.11ac amendment.

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Questions 8

Option 43 must be configured to allow access points to locate controllers. In what network service should this option be configured?

Options:

A.

DHCP

B.

LDAP

C.

DNS

D.

RADIUS

Questions 9

When considering data rates available in HT and VHT PHY devices, in addition to the modulation, coding, channel width, and spatial streams, what impacts the data rate according to the MCS tables?

Options:

A.

The frequency band in use

B.

The client drives

C.

The guard interval

D.

The height of the antennas

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Questions 10

What factor will have the most significant impact on the amount of wireless throughput available to each station within a BSS?

Options:

A.

The Layer 3 protocol used by each station to transmit data over the wireless link

B.

The number of client stations associated to the BSS

C.

The power management settings in the access point beacons

D.

The presence of co-located (10m away) access points on non-overlapping channels

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Questions 11

What statement about 802.11 WLAN performance is true?

Options:

A.

In modem networks, both centralized and distributed data forwarding work well for most standard office deployments

B.

In most WLANs, no special skill or tuning is required to get peak performance

C.

WLANs perform better as more wireless clients connect with each AP

D.

To get the best performance out of an AP, you should disable data rates of 72 Mbps and lower

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Questions 12

In addition to coverage analysis result, what should be included in a post-deployment site survey report to ensure WLAN users experience acceptable performance?

Options:

A.

Layer 4 protocol availability analysis results

B.

Application Layer protocol availability analysis results

C.

Capacity analysis results

D.

WAN interface analysis results

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Questions 13

What statement about 802.3, Clause 33 Power over Ethernet is true?

Options:

A.

Only midspan PSEs are supported.

B.

The lowest voltage drop is achieved when using CAT6 instead of Cat5 or CAT5e.

C.

Only endpoint PSEs are supported.

D.

When using CAT5 cabling, you increase the maximum draw available to the PD over that available with CAT6.

Questions 14

You recently purchased four laptops containing dual-band 802.11ac adapters. The laptops can connect to your 2.4 GHz network, but they cannot connect to the 5 GHz network. The laptops do not show the 5 GHz SSIds, which are different than the 2.4 GHz SSIDs. Existing devices can connect to the 5 GHz SSIDs with no difficulty. What is the likely problem?

Options:

A.

Interference from non-Wi-Fi sources

B.

Faulty drivers

C.

DoS attack

D.

Interference from other WLANs

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Questions 15

You are troubleshooting a controller-based AP that is unable to locate the controller. DHCP is not used and the controller is located at 10.10.10.81/24 while the AP is on the 10.10.16.0/24 network. What should be inspected to verify proper configuration?

Options:

A.

NTP

B.

BOOTH

C.

DNS

D.

AP hosts file

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Questions 16

What is appended to the end of each 802.11 data frame after the payload?

Options:

A.

FCS

B.

Preamble

C.

MAC header

D.

PHY header

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Questions 17

In WLAN security, what authentication method always creates Layer 2 dynamic encryption keys?

Options:

A.

Shared Key

B.

WEP

C.

HTTPS captive portal

D.

EAP-TLS

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Questions 18

In a mesh BSS (MBSS), according to the 802.11-2016 standard, what device connects the mesh to an Ethernet network?

Options:

A.

Mesh Gate

B.

Mesh Switch

C.

Mesh Router

D.

Mesh Portal

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Questions 19

Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter.

What will cause high return loss in an RF transmission system, including the radio, cables, connectors and antenna?

Options:

A.

The use of cables longer than one meter in the RF system

B.

High output power at the transmitter and use of a low-gain antenna

C.

A Voltage Standing Wave Ratio (VSWR) of 1:1

D.

An impedance mismatch between components in the RF system

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Questions 20

You are reconfiguring an AP to use the short guard interval. How long will the new guard interval duration be after the change?

Options:

A.

400 ns

B.

10 ms

C.

800 ns

D.

104 ms

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Questions 21

In an 802.11 2.4 GHz system, what 22 MHz channels are considered non-overlapping?

Options:

A.

11 and 6

B.

7 and 11

C.

1 and 5

D.

2 and 8

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Questions 22

When a client station sends a broadcast probe request frame with a wildcard SSID, how do APs respond?

Options:

A.

For each probe request frame, only one AP may reply with a probe response.

B.

Each AP responds in turn after preparing a probe response and winning contention.

C.

Each AP checks with the DHCP server to see if it can respond and then acts accordingly.

D.

After waiting a SIFS, all APs reply at the same time with a probe response.

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Questions 23

You administer a WLAN that offers a guest SSID of GUESTNWORK. User connect to the GUESTNWORK SSID, but report that they cannot browse the internet. The devices simply report no internet connection. What common problem causes this scenario?

Options:

A.

NTP issues

B.

Hardware issues

C.

IP routing issues

D.

Captive portal issues

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Exam Code: CWNA-107
Exam Name: Certified Wireless Network Administrator
Last Update: Dec 22, 2024
Questions: 156

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