What is the maximum execution timeout for AWS Lambda functions?

15 minutes (900 seconds)

True or False: Lambda functions can have memory allocation ranging from 128 MB to 5 GB.

False. Lambda memory ranges from 128 MB to 10,240 MB (10 GB).

Which invocation type allows the caller to wait for function completion?
A. Asynchronous
B. Synchronous
C. Polling
D. Event-driven

B. Synchronous

At _____ MB memory allocation, Lambda provides 1 full vCPU.

1,769

What happens when Lambda concurrent executions exceed the regional limit?

Requests are throttled and receive 429 errors or retries.

True or False: S3 can trigger Lambda functions in different AWS regions.

False. S3 event notifications and Lambda must be in same region.

Which service requires polling invocation model?
A. API Gateway
B. S3
C. SQS
D. SNS

C. SQS

What is the default concurrent execution limit per region?

1,000

Lambda functions in VPC lose _____ access by default.

Internet

True or False: Reserved concurrency prevents other functions from using account concurrency.

True. Reserved concurrency caps function usage and protects other functions.

A Lambda function times out accessing external APIs from VPC. RDS access works fine. What's missing?
A. IAM permissions
B. Security groups
C. NAT Gateway
D. Larger memory

C. NAT Gateway

What directory do Lambda layers extract to in execution environment?

/opt

How many retries does Lambda perform for asynchronous invocations?

2 retries automatically

True or False: Provisioned concurrency eliminates cold starts but charges even when idle.

True. You pay for provisioned concurrency regardless of usage.

Which alias feature enables canary deployments?
A. Version pinning
B. Weighted routing
C. Environment variables
D. Resource policies

B. Weighted routing

Lambda charges are calculated using _____ and execution duration.

Number of requests

What happens when you set reserved concurrency to 0?

The function is disabled completely.

True or False: Environment variables support automatic secret rotation.

False. Use Secrets Manager for automatic rotation instead.

A function receives 429 errors during traffic spikes. All permissions are correct. What should you check first?
A. Memory allocation
B. Timeout settings
C. Concurrent execution metrics
D. VPC configuration

C. Concurrent execution metrics

Maximum number of layers attachable per Lambda function is _____.

5

Which service manages Lambda function orchestration for complex workflows?

Step Functions

True or False: Lambda automatically retries failed polling invocations until data expires.

True. For streams like Kinesis, Lambda retries until success or expiration.

Your production function needs gradual rollout of new version to 20% traffic. What AWS feature enables this?
A. CodeDeploy only
B. Multiple functions
C. Alias weighted routing
D. Environment variables

C. Alias weighted routing

What should you initialize outside the handler function for better performance?

SDK clients and database connections

Lambda function processes SQS messages but creates duplicate database records on retries. What pattern prevents this?

Implement idempotent logic to check existing records.

True or False: VPC endpoints reduce costs compared to NAT Gateway for AWS service access.

True. VPC endpoints avoid NAT Gateway data transfer charges.

What is the total size limit for all environment variables combined?

4 KB