300-435 Questions and Answers

Graphical user interface, text, application Description automatically generated

This API request is constructed to query the Cisco SD-WAN vManage Statistics API for application route statistics based on the specified device ID and colors for the local and remote endpoints. References: (Automating Cisco Enterprise Solutions Official Cert Guide)

https://developer.cisco.com/docs/dna-center/#!device-provisioning/goal

 The NETCONF  operation is used to retrieve running configuration and state data from the network device. In the provided exhibit, the  operation includes a filter that specifies two YANG models: Cisco-IOS-XE-native and Cisco-IOS-XE-ntp-oper. The first model, Cisco-IOS-XE-native, is indicated by the namespace “http://cisco.com/ns/yang/Cisco-IOS-XE-native” and includes details such as hostname and IP address within its hierarchy. The second model, Cisco-IOS-XE-ntp-oper, is indicated by the namespace “http://cisco.com/ns/yang/Cisco-IOS-XE-ntp-oper” and includes details related to NTP (Network Time Protocol) associations and status information. Therefore, the NETCONF   operation in this exhibit interacts with two YANG models. References: = ( Automating Cisco Enterprise Solutions Official Cert Guide )

• B. The ethernetCsmacd type is imported from the iana-if-type module: This is correct because the XML response shows ethernetCsmacd, indicating that the ethernetCsmacd type is defined within the iana-if-type module.
• D. ipv4 is a container defined in the ietf-ip module: This is accurate as the XML response includes , which specifies that ipv4 is a container within the ietf-ip module.

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

• It is a device-independent method for automation and can be used with any type of device or operating system:
• It does not require any modules of software except SSH to be loaded on the network device:

Comprehensive and Detailed Step by Step Explanation:

• It is a device-independent method for automation and can be used with any type of device or operating system:
• It does not require any modules of software except SSH to be loaded on the network device:

References:

• Automating Cisco Enterprise Solutions Official Cert Guide
• Ansible Documentation

To insert the project into Git using the account python_programmer, one would need to initialize the local directory as a Git repository, add files to it, commit those files with an appropriate message, add a remote repository URL pointing to where the repository should be pushed on GitHub under python_programmer’s account, and finally push the changes up to that remote repository. Option A follows this process correctly: ‘git init’ initializes the local directory as a Git repository; ‘git add “device_status.py”’ stages changes; ‘git commit -m “Initial Revision”’ commits staged changes with message; ‘git remote add origin 6’ adds new remote repo; ‘git push -u origin master’ pushes committed changes up to GitHub. References: = Automating Cisco Enterprise Solutions Official Cert Guide

MQTT is a lightweight messaging protocol that uses a publish/subscribe model. This means that clients can subscribe to topics, and when a message is published to that topic, all subscribers receive the message. It’s designed for connections with remote locations where a small code footprint is required or network bandwidth is limited. References: Automating Cisco Enterprise Solutions Official Cert Guide

 To automate the creation of a network on the Meraki dashboard that supports only wired network connections, the type ‘switch’ needs to be added to the API. This is because ‘switch’ refers to network switches, which are hardware devices that connect devices on a computer network by using packet switching to receive, process, and forward data to the destination device. In contrast, ‘wireless’ would refer to Wi-Fi connections, ‘appliance’ could refer to security appliances or other types of network equipment not specifically related to wired connections, and ‘systemsManager’ is related to mobile device management. References := ( Automating Cisco Enterprise Solutions Official Cert Guide )

MV Sense MQTT API has the capability to request and subscribe to historical, current, or real-time data. This allows applications to receive updates about what’s happening in an environment monitored by Meraki MV smart cameras. References: Automating Cisco Enterprise Solutions Official Cert Guide

The primary function of the Cisco SD-WAN vManage Certificate Management API is to install signed certificates on network devices. This process is crucial for establishing trusted communications between devices managed via vManage. References := (Automating Cisco Enterprise Solutions Official Cert Guide)

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

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

 When adding a device to a site using the Cisco DNA Center Sites API, you need to know the site identifier. If you only have the site name, you can retrieve the site identifier by making an API call to /dna/intent/api/v1/site. This call will provide you with the necessary information to properly add the device to the network.

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.

 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

The curl command used to update settings typically involves making an HTTP PUT request to modify existing resources on the server. In this case, to update the SNMP community of network ID “1234567” to read-only, one would need to use a curl command that specifies the PUT method, includes headers indicating content type (usually application/json), and provides authentication credentials if necessary. The correct command should also include the appropriate body content specifying the new SNMP community settings. 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 )

Table Description automatically generated with medium confidence

 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 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

 Webhooks generated by Cisco DNA Center use REST calls to deliver notifications. Specifically, they utilize JSON payloads delivered via POST requests. These webhooks are essential for real-time event handling and automation.

References:

• Automating Cisco Enterprise Solutions Official Cert Guide

Software-defined networks (SDNs) are designed to be more flexible and easier to manage compared to traditional infrastructure. They utilize overlay networks to decouple network services from the hardware, allowing for efficient resource utilization and simplified virtual network services provisioning. SDNs are also designed to adapt quickly to changing business needs or traffic patterns, without the need for manual reconfiguration or significant downtime.

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

• The Cisco DNA Center Intent API communicates in the northbound direction.
• Northbound APIs are used to expose functionality and data from the controller (such as Cisco DNA Center) to external applications or services.

References:

• Cisco DevNet - Intent APIs

To create a Python script that pulls inventory for Cisco SD-WAN Viptela devices using the Viptela library, the correct action is:

• C: from viptela.viptela import Viptela. This import statement is used to import the Viptela class from the viptela.viptela module, which is part of the Python SDK for Cisco Viptela vManage. This SDK allows for interaction with Cisco SD-WAN Viptela devices through various API calls, enabling the automation of tasks such as pulling inventory data1.

References:

• CiscoDevNet/python-viptela: Cisco Viptela vManage Python CLI/SDK on GitHub

Graphical user interface, text, email Description automatically generated

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

The error is due to Command Runner in Cisco DNA Center being designed to support only the execution of ‘show’ commands or other read-only commands. When an engineer tries to execute configuration commands or any commands that are not read-only, they will be blocklisted as these are not supported by Command Runner. This ensures that Command Runner is used strictly for retrieving information without making any configuration changes to devices. References := (Automating Cisco Enterprise Solutions Official Cert Guide)

The provided exhibit likely shows a POST request setup in an API testing tool like Postman, with JSON formatted data specifying commands for configuring a network device interface. These commands are not supported by Command Runner as it does not allow configuration changes, only read operations.