The correct answer is that Interface Endpoints are powered by AWS PrivateLink, while Gateway Endpoints rely on route table entries rather than PrivateLink. This distinction is fundamental because Gateway Endpoints function as a target in a VPC route table, allowing traffic to flow directly to supported services like S3 and DynamoDB without traversing the internet or using a separate networking appliance, whereas Interface Endpoints create an elastic network interface in your subnet using PrivateLink to privately connect to a wide range of AWS services. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of how VPC endpoint types differ in architecture, cost, and service support—a common trap is assuming all endpoints use PrivateLink or that Gateway Endpoints incur hourly charges. Remember the memory tip: Gateway = “Goes via routes” (only S3 and DynamoDB, no PrivateLink, no cost), while Interface = “Inside your subnet” (uses PrivateLink, incurs hourly and data processing fees).
ANS-C01 Network Implementation Practice Question
This ANS-C01 practice question tests your understanding of network implementation. Match the stated requirement to the specific cloud service, access model, or configuration option — many options are valid in isolation but not for this scenario. 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.
Which TWO of the following are true about AWS VPC endpoints? (Choose two.)
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Gateway Endpoints can be used to access Amazon S3 and DynamoDB.
Options B and D are correct. A is wrong because Gateway Endpoint does not use PrivateLink; it uses route table entries. C is wrong because Interface Endpoints are not free; you pay per hour and per GB processed. B: Gateway Endpoints support S3 and DynamoDB. D: Interface Endpoints are powered by PrivateLink.
Key principle: NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✓
Gateway Endpoints can be used to access Amazon S3 and DynamoDB.
Static NAT maps one inside address to one outside address.
✗
Interface Endpoints are free of charge.
Why it's wrong here
There are hourly charges and data processing fees.
✗
Gateway Endpoints use AWS PrivateLink.
Why it's wrong here
Gateway Endpoints are route-based; PrivateLink is used for Interface Endpoints.
✗
Both Gateway and Interface Endpoints require a NAT gateway.
Why it's wrong here
Endpoints work without NAT; they provide private connectivity.
✓
Interface Endpoints are powered by AWS PrivateLink.
Why this is correct
PrivateLink enables Interface Endpoints.
Related concept
Static NAT maps one inside address to one outside address.
Common exam traps
Common exam trap: NAT rules depend on direction and matching traffic
NAT is not only about the public address. The inside/outside interface roles and the ACL or rule that matches traffic are just as important.
Detailed technical explanation
How to think about this question
NAT questions usually test address translation, overload/PAT behaviour, static mappings and whether the right traffic is being translated. Read the interface direction and address terms carefully.
KKey Concepts to Remember
Static NAT maps one inside address to one outside address.
PAT allows many inside hosts to share one public address using ports.
Inside local and inside global describe the private and translated addresses.
NAT ACLs identify traffic for translation, not always security filtering.
TExam Day Tips
→Identify inside and outside interfaces first.
→Check whether the scenario needs static NAT, dynamic NAT or PAT.
→Do not confuse NAT matching ACLs with normal packet-filtering intent.
Key takeaway
NAT direction and interface roles matter as much as the IP address mapping. Inside/outside designation controls which traffic is translated.
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.
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
Network Implementation — This question tests Network Implementation — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Gateway Endpoints can be used to access Amazon S3 and DynamoDB. — Options B and D are correct. A is wrong because Gateway Endpoint does not use PrivateLink; it uses route table entries. C is wrong because Interface Endpoints are not free; you pay per hour and per GB processed. B: Gateway Endpoints support S3 and DynamoDB. D: Interface Endpoints are powered by PrivateLink.
What should I do if I get this ANS-C01 question wrong?
Review the four NAT address types (inside local, inside global, outside local, outside global), PAT port overload, and static vs dynamic NAT use cases. Then practise related ANS-C01 NAT questions on configuration and troubleshooting.
What is the key concept behind this question?
Static NAT maps one inside address to one outside address.
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Question Discussion
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