200-901 Exam Dumps - Cisco Certified DevNet Associate Questions and Answers

The control plane in networking is responsible for routing and signaling functions. Protocols like BGP (Border Gateway Protocol) operate on the control plane because they manage the routing information and decisions that control how packets are forwarded through the network. BGP specifically is used to exchange routing information between different autonomous systems on the internet.

References:

Cisco Networking - Control Plane

Cisco DevNet Associate Certification Guide

Model-driven programmability refers to using data models to define the desired state of network infrastructure and automate its configuration and management. This approach offers several benefits:

Infrastructure Resource Optimization: Model-driven programmability allows for more efficient use of network resources by ensuring consistent and optimal configurations. Automation driven by data models helps in reducing human errors and improving the overall performance and utilization of the infrastructure.

Consistency: Automated, model-driven configurations ensure that network devices are consistently configured, reducing variability and the risk of misconfigurations.

Scalability: It enables scalable automation solutions that can easily adapt to changing network requirements and topologies.

References:

Cisco DevNet Associate Certification Guide

Cisco Model-Driven Programmability

To protect secrets such as API URLs, shared keys, and other application configurations, it is best practice to: C. Ensure they never appear in plaintext at rest or in transit. Encrypt sensitive data both when it is stored (at rest) and when it is transmitted over the network (in transit). This prevents unauthorized access and exposure. E. Always store secrets in a secure vault. Use dedicated secret management tools like HashiCorp Vault, AWS Secrets Manager, or Azure Key Vault to store and manage sensitive information securely. These tools provide mechanisms for access control, audit logging, and automatic rotation of secrets.

References:

Securing Secrets

HashiCorp Vault

AWS Secrets Manager

The git merge-file command is used to merge changes from a specified file into the working directory file. This is particularly useful when you have a separate file with bug fixes and you need to incorporate those fixes into your production code. The command takes three files: the base file, the current file, and the file with changes. It then merges the changes into the current file.

Example usage:

bash

Copy code

git merge-file

References:

Git Documentation - git merge-file

Cisco DevNet Associate Certification Guide

The diff command is used to compare the contents of two files and display the differences. The -u option stands for "unified" and shows the differences in a unified format, which includes the lines that differ between the two files along with a few lines of context.

When running the command diff -u file1.txt file2.txt, it compares the two files and shows the differences between them.

References:

GNU Diffutils: Unified Format

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

Comparing a current version of code to a previous version is a common practice in software development for troubleshooting code failures. This process, often referred to as "diffing," helps developers identify changes that might have introduced bugs or caused the application to behave incorrectly. By pinpointing these changes, developers can more efficiently debug and resolve issues.

References:

Atlassian - Comparing code differences

Cisco DevNet Associate Certification Guide

Rate limiting is a technique to control the rate of incoming and outgoing traffic to or from a network. If rate limiting is not implemented, excessive API requests can overwhelm the server, causing long response times and abandoned requests.

Abandoned Requests: When a server is overwhelmed with too many requests, it may not process them all, leading to abandoned requests.

Long Response Times: Without rate limiting, the server might be handling more requests than it can efficiently process, resulting in delayed responses.

Solution: Implementing rate limiting ensures that the server processes requests at a manageable rate, improving performance and reliability.

References:

Rate Limiting and API Performance: Understanding Rate Limiting

A 401 error indicates unauthorized access. To fix this, the script needs to include the appropriate authorization token in the request headers.

Authorization Header: The Authorization header with a Bearer token is commonly used for OAuth 2.0 authorization.

Bearer Token: This token is used to authenticate API requests securely.

Option A is correct as adding the Authorization header with the Bearer token is the proper way to authenticate the request and resolve the 401 error.