300-435 Automating Cisco Enterprise Solutions (ENAUTO) Questions and Answers

When integrating a Grafana dashboard with Cisco DNA Center to receive network events, the integration bundle that is enabled is:

• C: Network Events for REST API Endpoint. This integration allows Grafana to receive network event notifications from Cisco DNA Center. The REST API Endpoint serves as the interface through which Grafana can subscribe to and receive network events, which can then be visualized on the dashboard1.

References:

• Automating Cisco Enterprise Solutions Official Cert Guide
• Cisco DNA Center documentation on Grafana Labs2
• Cisco Community discussion on using DNA Center as a datasource in Grafana3
• Cisco developer blog on DNA Center NOC Dashboard

 To replace device configuration using RESTCONF with the Python library Requests, one would use the put() method. The put() method in HTTP is used to update an existing resource or create it if it does not exist. In RESTCONF, which operates over HTTP, using put() will replace the entire target configuration datastore with the payload specified in the request. References: Automating Cisco Enterprise Solutions Official Cert Guide

The Cisco SD-WAN vManage Certificate Management API is primarily used for certificate-related operations within the SD-WAN fabric. The correct purpose of using this API is:

• A: To generate a Certificate Signing Request (CSR). The CSR is a request sent from an applicant to a certificate authority to apply for a digital identity certificate. It contains information that will be included in the certificate, such as the applicant’s public key and organization details. Once the CSR is generated, it can be signed by a Certificate Authority (CA) to create a certificate1.

References:

• Cisco Catalyst SD-WAN CloudOps - Certificate Management1
• Cisco SD-WAN API documentation2
• Understand the Web Certificate For vManage - Cisco

https://developer.cisco.com/docs/dna-center/2-3-5/sync-devices/

Operation Id: syncDevices

Description: Sync the devices provided as input

curl -L --request PUT \

--url /dna/intent/api/v1/network-device \

--header 'Accept: application/json' \

--header 'Content-Type: ' \

--data '{ "type": "COMPUTE_DEVICE" }'

AND

Operation Id: syncDevicesNetworkDevice

Description: Synchronizes the devices. If forceSync param is false (default) then the sync would run in normal priority thread. If forceSync param is true then the sync would run in high priority thread if available, else the sync will fail. Result can be seen in the child task of each device.

curl -L --request PUT \

--url /dna/intent/api/v1/network-device/sync \

--header 'Accept: application/json' \

--header 'Content-Type: ' \

--data '{}'

 Native YANG models are specific to a vendor’s platform, incorporating proprietary features, whereas OpenConfig models are vendor-neutral and created for interoperable use across different platforms.

 Software-defined networks (SDNs) offer several advantages over traditional networks; one key advantage is their distributed management architecture. Unlike traditional networks where the control plane (which makes decisions about where traffic should be sent) and the data plane (which actually sends packets according to those decisions) are coupled on each networking device leading to potential single points of failure, SDNs separate these planes. This separation allows for centralized control with a global view of the network state while maintaining local data forwarding at each switch. This architecture enhances resilience as it can dynamically adjust and reroute traffic around failed nodes or congested paths without manual intervention. References := ( Automating Cisco Enterprise Solutions Official Cert Guide )

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In Cisco DNA Center Operational Tool API, the Command Runner section of the intent API is designed to retrieve keywords accepted by CLI and enables execution of read-only commands on network devices. This feature allows administrators to retrieve real-time configuration data from devices without making any changes, aiding in monitoring and troubleshooting tasks. References: Automating Cisco Enterprise Solutions Official Cert Guide

 The ‘name’ parameter is essential as it defines the unique identifier for the network within the organization. The ‘type’ parameter determines the kind of network to be created, such as wireless or switch. These two parameters are crucial for the initial setup of a network using the Cisco Meraki API. References := (Automating Cisco Enterprise Solutions Official Cert Guide)

The ENAUTO exam tests knowledge of implementing enterprise automated solutions, including programming concepts, Python programming, APIs, controllers, and automation tools. Without the specific Python code from the exhibit, I can’t provide the expected output. Generally, Python code in the context of ENAUTO might involve interacting with APIs or automating network configurations. The output would depend on the code’s function, such as retrieving data from an API or configuring network devices. References := Automating Cisco Enterprise Solutions Official Cert Guide

The YANG module defines a structure for network interfaces, including elements such as “name,” “address,” “netmask,” and “subnet.” The valid XML instance must adhere to this structure. Option A presents an XML instance that correctly reflects the hierarchy and elements specified in the YANG module, with appropriate namespace declarations and values for each element that are consistent with their definitions in the YANG model.

References := ( Automating Cisco Enterprise Solutions Official Cert Guide )

The YANG module tree diagram represents the data model for network configuration and state data used by management protocols like NETCONF and RESTCONF. In this diagram, containers are denoted by curly braces {} and represent groupings of related data within the model. The three containers identified in the image are “interface,” “statistics,” and “discontinuity-time,” which organize related configuration or state information.

References: Automating Cisco Enterprise Solutions Official Cert Guide

REST API calls are characterized as being stateless and implemented over HTTP. Being stateless means that each request from client to server must contain all of the information needed to understand and complete the request; there is no session state stored on the server. Implemented over HTTP indicates that REST APIs use standard web protocols for communication. References: Automating Cisco Enterprise Solutions Official Cert Guide

 A HTTP 206 status code is returned when the server successfully processes a partial GET request specified by the range header in the client’s request. This is commonly used in situations where large files are being transferred, and the client needs to download or stream only a portion of the file. References := (Automating Cisco Enterprise Solutions Official Cert Guide)

 To attach a device template in Cisco SD-WAN, you must issue a POST call to initiate the attach action. This is the first step in the process. After initiating the attach action, you need to monitor the status of the action. For this, you issue a “monitor device action status” GET API request with the process ID. The process ID is used to track the status of the attach action until it is completed.

References := Automating Cisco Enterprise Solutions Official Cert Guide, SD-WAN 

Cisco DNA Center manages third-party devices using device packages. These packages contain the necessary information and protocols to integrate third-party devices into the Cisco DNA Center ecosystem, allowing for unified management across different vendors’ equipment. References: Automating Cisco Enterprise Solutions Official Cert Guide

 The statement ‘D’ is used to assign the list of interfaces from the JSON response to the variable ‘interfaces’. This allows the script to iterate over each interface and print the IP addresses of all loopback interfaces.

Python virtual environments are a tool used to create isolated Python environments, each with its own set of dependencies. This isolation is beneficial for several reasons:

• D: Virtual environments allow developers to create a Python environment quickly for testing and debugging purposes. This is because each virtual environment can have its own set of dependencies, which may be different from those installed globally or in other virtual environments. This isolation helps ensure that the environment reflects the production environment as closely as possible, which is crucial for accurate testing and debugging12.
• E: They enable the creation of an isolated Python environment with module dependencies. This means that the dependencies installed in a virtual environment do not affect the system-wide Python installation or other virtual environments. This isolation prevents conflicts between project dependencies and allows for more precise control over the environment in which your code runs12.

References:

• Automating Cisco Enterprise Solutions Official Cert Guide
• Real Python’s "Python Virtual Environments: A Primer"1
• Dataquest’s "A Complete Guide to Python Virtual Environments"

Zero Touch Provisioning (ZTP) is a method used to automate the process of configuring network devices without manual intervention. When a device is first powered on, it uses DHCP to obtain an IP address and other network settings, including the location of a TFTP server from which it can download its initial configuration. This allows devices to be deployed at scale with minimal effort, as they can automatically configure themselves as soon as they are connected to the network. References := (Automating Cisco Enterprise Solutions Official Cert Guide)

 MQTT is a lightweight messaging protocol that operates on a publish-subscribe model, allowing clients to subscribe to topics and receive messages sent to those topics by any client. It is designed for connections with remote locations where a small code footprint is required or network bandwidth is limited.

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The correct line of code for converting the data saved to the variable “example” into a dictionary is json.loads(example), which is Option C. This function is used to parse JSON formatted strings into a Python dictionary, which is the required operation in this case. References := ( Automating Cisco Enterprise Solutions Official Cert Guide )

 To create a new network called “Test” using the Meraki API, the correct URI is the one that uses the POST method to the endpoint that includes the organization ID but not a specific network ID. Therefore, option D is the correct answer. References := ( Automating Cisco Enterprise Solutions Official Cert Guide )

https://developer.cisco.com/meraki/api-v0/create-organization-network/

 In RESTCONF API calls, when specifying the content type in HTTP headers for requests or responses involving YANG-modeled data, ‘yang-data+json’ is used as part of the ‘Accept’ or ‘Content-Type’ headers to indicate that the message body contains JSON-encoded YANG-modeled data.

In this Python script using RESTCONF, ‘yang-data+json’ completes the highlighted areas because it specifies that JSON format is expected in response which conforms with YANG data modeling standards.

References: Automating Cisco Enterprise Solutions Official Cert Guide

The difference between OpenConfig and native YANG data models lies in their development and purpose:

• D: Native models are developed by vendors and are specific to their platforms. They are designed to integrate features or configurations that are relevant only to that vendor’s platform. Native models, being vendor-specific, provide the most detailed and granular control over the vendor’s devices1.

OpenConfig models, on the other hand, are developed by a collaborative group of network operators and are intended to be vendor-neutral. They aim to provide a more standardized model that can be used across different vendors’ equipment, focusing on the needs of the operators rather than the specific capabilities of the devices1.

References:

• Cisco Blogs on YANG models1
• CBT Nuggets on Native YANG models2
• Introduction to YANG - LTRSDN-2260

 In Ansible, the state parameter is used to define the desired state of a resource on the remote device. The options typically include “present” or “absent,” indicating whether the resource should exist or not. In this context, “present” is used to ensure that the VRFs defined in the local_vrfs variable are configured on the target device. Therefore, the string that completes the code for configuring VRF information using a local_vrfs variable is “present.” References: = Automating Cisco Enterprise Solutions Official Cert Guide

Synchronous calls to APIs are characterized by their blocking nature, meaning the process making the request must wait until it gets a reply before it can proceed with other tasks. This can add perceived latency to an application if there is a delay in receiving data. Synchronous APIs provide immediate feedback, which is essential for operations requiring instant confirmation and interaction4567. References := ( Automating Cisco Enterprise Solutions Official Cert Guide )

It can be filtered using the searchBy query and it can be: MAC Address or Device Name value or UUID of the network device https://developer.cisco.com/docs/dna-center/#!get-device-detail

The exhibit is a read-only YANG leaf ("ro vlan") therefore is classed as "state" date and not config data. As such the statement is what you need to use to interact with this particular YANG model. Reference documentation: https://blogs.cisco.com/developer/ask-hank-yang-leaves

 In NETCONF telemetry subscriptions with Cisco IOS XE devices, the correct XML tag to complete the subscription is “period”. This tag defines the interval in milliseconds at which the telemetry data will be collected and sent. The “period” tag is used to set a fixed time interval for data collection, as opposed to other options like “frequency” which would imply a rate of occurrence or “cadence” which refers to the flow or rhythm of events. References := ( Automating Cisco Enterprise Solutions Official Cert Guide )