Common Traps on Router R1 Cannot Reach R3 Practice Questions
- ·Check both forward and return paths.
- ·A correct-looking route can still fail if the next hop is unreachable.
- ·Administrative distance and longest-prefix match can change which route is used.
Sample Questions
Practice all 5 →A developer is troubleshooting an AWS Lambda function that processes records from an Amazon Kinesis Data Stream. The function is configured with a batch size of 100 and a parallelization factor of 1. The developer notices that the iterator age is increasing, indicating that the function is not keeping up with the stream. CloudWatch Logs show that the function is not experiencing errors or throttling, but the execution time per invocation is close to the 5-minute timeout. The stream has 10 shards. Which action will most likely increase processing throughput?
Explanation: The function is slow per invocation, likely due to insufficient CPU or memory. Increasing Lambda memory proportionally increases CPU, which can reduce execution time and allow the function to process more records per second. While increasing the parallelization factor could help by processing multiple batches per shard concurrently, the fundamental bottleneck is the per-invocation processing time. Increasing memory addresses that bottleneck directly.
A developer is building a REST API using Amazon API Gateway and wants to transform the request data before sending it to the backend Lambda function. The transformation includes mapping query string parameters to a JSON body. Which API Gateway feature should be used?
Explanation: API Gateway mapping templates, written in Velocity Template Language (VTL), are used to transform incoming requests and outgoing responses. They can map query string parameters, path parameters, headers, and body to the format expected by the backend. Lambda authorizers handle authentication, request validators validate the request against a schema, and CORS configuration manages cross-origin requests; none of these perform data transformation.
A company is developing a web application that runs on Amazon EC2 instances. The application needs to access an Amazon DynamoDB table to store and retrieve data. The security team requires that no IAM users or roles should be used; instead, the application must use temporary credentials that are automatically rotated. Which approach should the developer use to securely grant access to DynamoDB?
Explanation: The best practice is to assign an IAM role to the EC2 instance (instance profile) and then have the application obtain temporary credentials from the instance metadata service (IMDS). The IAM role's permissions are managed centrally and credentials are automatically rotated by AWS. This satisfies the requirement to use temporary credentials that are automatically rotated.
A developer is building a serverless application using AWS Lambda and Amazon API Gateway. The API must support different HTTP methods (GET, POST, PUT, DELETE) for the same resource path. The developer wants to define the API in a single Lambda function that can handle all methods without additional mapping configuration. Which Lambda integration type should the developer use?
Explanation: Lambda proxy integration passes the entire HTTP request to the Lambda function as-is. The Lambda function is then responsible for parsing the request and returning an appropriate response. This allows handling multiple HTTP methods in a single function without defining separate integration mappings. Custom integration requires mapping templates and is more complex. AWS service integration is for other AWS services, and HTTP integration is for backend HTTP endpoints.
An Elastic Beanstalk deployment must avoid downtime and create a full new set of instances before swapping traffic, accepting higher temporary cost. Which policy fits?
Explanation: Immutable deployments launch a full replacement fleet and switch traffic after health checks, reducing deployment risk.
Related Topics
Frequently asked questions
How do "Router R1 Cannot Reach R3 Practice Questions" appear on the real DVA-C02?
Practise routing and connectivity troubleshooting scenarios involving R1, R2, R3, static routes, OSPF, next hops and routing tables. These appear throughout the DVA-C02 and require you to apply your knowledge, not just recall facts.
How many scenario questions are on the DVA-C02 exam?
Cisco doesn't publish an exact breakdown, but scenario-based questions (especially exhibit and command-output formats) make up a significant portion of the DVA-C02. Practicing each scenario type ensures you're ready for any format.
Are these DVA-C02 scenario practice questions free?
Yes — all scenario practice on Courseiva is completely free. Sign up for a free account to track your progress and see which scenario types you've mastered.
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