Implement Client Connectivity Options in the Azure Cosmos DB SDK DP-420 Practice Questions (Page 1)

Questions 1–5

1. 1foundation · easy

   Why is it recommended to use a singleton instance of the CosmosClient in an application?

   • ATo ensure that each request uses a different connection for load balancing
   • BTo reduce the number of open connections and improve resource usage
   • CTo allow multiple threads to share the same client without any synchronization
   • DTo avoid the need for authentication on each request
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2. 2application · medium

   A high-throughput IoT application uses the .NET SDK for Azure Cosmos DB. The application performs many point reads and writes concurrently. The team notices that the default connection configuration is causing throttling under peak load. They want to increase the number of connections and the concurrency per connection without changing the application logic. What should they do?

   • AIncrease MaxConnectionsPerEndpoint and MaxConcurrentOperationsPerConnection on the CosmosClient.
   • BSwitch to Gateway mode to reduce the number of connections.
   • CCreate multiple CosmosClient instances to distribute load.
   • DUse the BulkExecutor library to batch operations.
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4. 3application · medium

   A support engineer needs to troubleshoot a performance issue in an application that uses the Cosmos DB SDK. They want to log the request diagnostics for each operation to a file. What should they do?

   • AEnable the 'ConnectionMode' to 'Gateway' to get more logs.
   • BUse the SDK's diagnostics handler to write diagnostics to a file.
   • CSet 'MaxRetryAttemptsOnThrottledRequests' to 0 to get more logs.
   • DUse the Azure portal's metrics to get request-level logs.
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5. 4application · medium

   A company has a strict network policy that only allows outbound HTTPS traffic on port 443. They need to connect their application to Azure Cosmos DB. Which connectivity mode should they use?

   • ADirect mode with HTTPS
   • BDirect mode with TCP
   • CGateway mode with TCP
   • DGateway mode
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6. 5application · medium

   A financial services application uses the .NET SDK for Azure Cosmos DB. During a regional outage, the SDK throws a 'CosmosException' with status code 503. The team wants to implement a retry strategy that handles transient errors without masking permanent failures. They also want to log the retry attempts. What should they do?

   • AConfigure the CosmosClient with a custom RetryHandler that retries on 503 and logs each attempt.
   • BUse the built-in retry policy and disable logging to reduce overhead.
   • CCreate a new CosmosClient for each retry attempt.
   • DCatch the exception in the application code and retry indefinitely.
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