The correct answer is that the engineer can create an interface VPC endpoint to the services. This is because the `aws ec2 describe-vpc-endpoint-services` CLI output lists AWS-managed service names, such as `com.amazonaws.vpce.us-east-1.s3`, which are specifically designed to be accessed via interface endpoints that use Elastic Network Interfaces with private IP addresses. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this scenario tests your understanding of VPC endpoint service CLI output and the distinction between Gateway and Interface endpoints—a common trap is assuming all services require Gateway endpoints, but the presence of a `vpce` prefix in the service name indicates an interface-based service. Remember the memory tip: "If you see `vpce` in the name, think interface, not gateway."
ANS-C01 Network Design Practice Question
This ANS-C01 practice question tests your understanding of network design. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
Network Topology
A network engineer is troubleshooting connectivity to a VPC endpoint service. The engineer runs the CLI command shown in the exhibit. The output shows two service names. Which statement is correct based on this output?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
The engineer can create an interface VPC endpoint to the services
The CLI command `aws ec2 describe-vpc-endpoint-services` returns a list of AWS services that support VPC endpoints. The output shows two service names, which are AWS-managed services (e.g., `com.amazonaws.vpce.us-east-1.s3`). These services can be accessed via interface VPC endpoints, which use Elastic Network Interfaces (ENIs) with private IP addresses to route traffic privately within the VPC. Therefore, the engineer can create an interface VPC endpoint to these services.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
The engineer can create an interface VPC endpoint to the services
Why this is correct
Correct; the command returns interface endpoint services, which can be used to create interface VPC endpoints.
Related concept
Read the scenario before looking for a memorised answer.
✗
The services are Gateway VPC endpoints
Why it's wrong here
Incorrect; Gateway endpoints are for S3 and DynamoDB, not shown here.
✗
The services are VPC peering connections
Why it's wrong here
Incorrect; VPC peering is not a VPC endpoint service.
✗
The services are Gateway Load Balancer endpoint services
Why it's wrong here
Incorrect; the filter specifies Interface type.
Common exam traps
Common exam trap: answer the scenario, not the keyword
AWS often tests the distinction between Gateway VPC endpoints and Interface VPC endpoints, and the trap here is that candidates may assume any service name returned by `describe-vpc-endpoint-services` is a Gateway endpoint, but the command lists all endpoint services, and the correct interpretation depends on the service name format and the type of endpoint supported.
Trap categories for this question
Command / output trap
Incorrect; Gateway endpoints are for S3 and DynamoDB, not shown here.
Detailed technical explanation
How to think about this question
Interface VPC endpoints are powered by AWS PrivateLink, which uses ENIs in the VPC subnet to provide private connectivity to supported AWS services. The `describe-vpc-endpoint-services` command returns a list of service names that can be used with `create-vpc-endpoint`; the service names in the output are typically in the format `com.amazonaws.vpce.<region>.<service-name>`. A common real-world scenario is connecting to an AWS Marketplace partner service or a custom NLB-backed service, where the service name is provided by the service provider.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A media company stores terabytes of video archives that are accessed once a year for audit purposes. Moving these objects to a cold storage tier (Azure Archive, S3 Glacier, or Google Nearline) costs a fraction of hot storage. Questions like this test whether you understand storage tiers, access frequency tradeoffs, and retrieval latency requirements.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Network Design — This question tests Network Design — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: The engineer can create an interface VPC endpoint to the services — The CLI command `aws ec2 describe-vpc-endpoint-services` returns a list of AWS services that support VPC endpoints. The output shows two service names, which are AWS-managed services (e.g., `com.amazonaws.vpce.us-east-1.s3`). These services can be accessed via interface VPC endpoints, which use Elastic Network Interfaces (ENIs) with private IP addresses to route traffic privately within the VPC. Therefore, the engineer can create an interface VPC endpoint to these services.
What should I do if I get this ANS-C01 question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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