The answer is a public virtual interface on the Direct Connect connection. This is the correct choice because a public virtual interface establishes BGP peering over your Direct Connect link, allowing you to advertise your company’s public IP prefixes directly to AWS. Unlike a private virtual interface, which only routes traffic to a specific VPC using private IPs, a public VIF is designed for reaching AWS public endpoints and supports the advertisement of customer-originated public prefixes via BGP. On the AWS Certified Advanced Networking Specialty ANS-C01 exam, this concept tests your understanding of how Direct Connect virtual interfaces differ, with a common trap being to select a private VIF for prefix advertisement. Remember the key distinction: private VIFs are for VPC connectivity only, while public VIFs handle public IP routing and BGP prefix announcements. A simple memory tip is “Public VIF for public prefixes”—if you need to advertise your own IPs to AWS, always choose the public interface.
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. 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.
A company is migrating its on-premises data center to AWS and wants to use AWS Direct Connect for private connectivity. The network team plans to advertise the company's public IP prefixes to AWS via BGP. Which AWS resource must be configured to allow advertisement of these prefixes?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
A public virtual interface on the Direct Connect connection
To advertise public IP prefixes over AWS Direct Connect, you must use a public virtual interface (VIF). A public VIF allows you to reach public AWS endpoints (such as S3, DynamoDB, or any public IP range) over the Direct Connect link, and it supports BGP peering where you can advertise your public IP prefixes to AWS. Private VIFs are only for private VPC connectivity and do not accept customer-originated public prefix advertisements.
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.
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse private VIFs (used for VPC connectivity) with public VIFs (used for public IP reachability), assuming that any BGP session on Direct Connect can advertise public prefixes, but only the public VIF is designed for that purpose.
Detailed technical explanation
How to think about this question
A public virtual interface on Direct Connect uses BGP to exchange routes with AWS's public ASN (typically 7224 or 64512 for public VIFs). When you advertise your public IP prefixes over this BGP session, AWS propagates them to its edge routers, allowing traffic destined to those prefixes to be routed through the Direct Connect link. This is commonly used for hybrid architectures where on-premises services need to be reachable from AWS public services or the internet via a private, low-latency path.
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 Management and Operations — This question tests Network Management and Operations — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: A public virtual interface on the Direct Connect connection — To advertise public IP prefixes over AWS Direct Connect, you must use a public virtual interface (VIF). A public VIF allows you to reach public AWS endpoints (such as S3, DynamoDB, or any public IP range) over the Direct Connect link, and it supports BGP peering where you can advertise your public IP prefixes to AWS. Private VIFs are only for private VPC connectivity and do not accept customer-originated public prefix advertisements.
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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