200-901 Exam Dumps - DevNet Associate (DEVASC)

Cisco SD-WAN (Software-Defined Wide Area Network) is a solution designed to optimize and secure connectivity across various networks. It provides several advantages including cost reduction from MPLS (Multiprotocol Label Switching), improved application performance by leveraging multiple types of connections (broadband, LTE, etc.), and simplified operations through centralized management.

Cost Reduction from MPLS: Cisco SD-WAN allows enterprises to utilize less expensive broadband internet connections alongside MPLS. This hybrid approach reduces dependency on costly MPLS circuits, significantly lowering WAN costs.

Improved Application Performance: By using application-aware routing, SD-WAN directs traffic across the best available path, ensuring better performance for critical applications.

Simplified Operations: Cisco SD-WAN centralizes network management and policy implementation, simplifying network operations and reducing the complexity associated with traditional WANs.

References:

Cisco SD-WAN Documentation: Cisco SD-WAN

pyATS (Python Automated Test Systems) is a comprehensive testing framework developed by Cisco, designed specifically for automating the testing of network devices. It provides a robust and flexible environment for creating and running tests on network devices and simulating network automation scenarios.

pyATS enables the creation of reusable test scripts and workflows that can be applied across different network environments and devices.

It supports various protocols and devices, allowing for extensive testing coverage.

It integrates well with other Cisco network automation tools and frameworks, making it a versatile choice for network engineers and developers.

References:

Cisco DevNet pyATS documentation

Cisco DevNet Associate Certification Guide

HTTP status codes are divided into five classes:

1xx (Informational): Request received, continuing process

2xx (Success): The action was successfully received, understood, and accepted

3xx (Redirection): Further action must be taken to complete the request

4xx (Client Error): The request contains bad syntax or cannot be fulfilled

5xx (Server Error): The server failed to fulfill an apparently valid request

Thus, the series that relate to errors are:

400 series (Client Error)

500 series (Server Error)

References:

RFC 7231, Section 6: HTTP/1.1 Semantics and Content

To retrieve a list of hosts using the Cisco DNA Center API, the provided Python script needs to be completed with the appropriate code snippets. Here's how the final script looks:

import json, requests, urllib3

from requests.auth import HTTPBasicAuth

from config import host, username, password

headers = { 'Content-Type': "application/json", 'x-auth-token': "csd0934rjxx" }

def dna_api_auth(host, username, password):

url = "https://{}/dna/system/api/v1/auth/token ".format(host)

response = requests.post(url, auth=HTTPBasicAuth(username, password), headers=headers, verify=False)

token = response.json()["Token"]

return token

def list_dna_devices(token):

url = "https://{}/dna/intent/api/v1/network-device ".format(host)

headers["x-auth-token"] = token

response = requests.get(url, headers=headers, verify=False)

data = response.json()

for item in data['response']:

print(item["hostname"])

token = dna_api_auth(host, username, password)

list_dna_devices(token)

application/json: This is used to set the content type for the headers.

token = response.json()["Token"]: This extracts the authentication token from the response.

data['response']: This accesses the 'response' part of the JSON data returned by the API.

token: This passes the token to the headers for authorization.

json(): This parses the response to JSON format.

for item in data['response']: This loops through each item in the response data.

hostname: This prints the hostname of each device.

References:

Cisco DNA Center Platform: Cisco DNA Center Platform

The PUT method is used to create or update a resource at a specific URL. In the given RESTCONF request and response example, the response indicates a successful creation of a resource, as evidenced by the HTTP status code 201 (Created). The request to create the "Australian Cattle Dog" resource under the "dogbreed" category would use the PUT method to ensure the resource is created or updated at the specified location.

References:

Cisco DevNet Documentation - RESTCONF Operations

IETF RFC 8040 - RESTCONF Protocol

Routers play a crucial role in networking by providing several key functions, including:

Broadcast Domain Segmentation: Routers separate broadcast domains, preventing broadcast traffic from one network segment from spreading to another. This improves network efficiency and reduces unnecessary traffic.

Routing: Routers forward packets between different networks based on IP addresses, enabling communication between devices on different subnets or networks.

Network Address Translation (NAT): Routers can perform NAT, which allows multiple devices on a local network to share a single public IP address.

References:

Cisco DevNet Associate Certification Guide

Cisco Router Functions

To copy a file from one directory to another and rename it in the process, the cp (copy) command in Linux can be used with the appropriate source and destination paths:

Command Breakdown:

cp: The copy command.

./TEST/config.txt: The source file path.

./PROD/current.txt: The destination file path with the new name.

Thus, the correct command to achieve this task is: cp ./TEST/config.txt ./PROD/current.txt

References:

Linux cp Command Manual

Cisco DevNet Associate Certification Guide