This ANS-C01 practice question tests your understanding of network implementation. 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 has a Direct Connect connection with a private VIF to a VPC. They also have a site-to-site VPN as a backup. The on-premises network advertises the same prefix via BGP over both connections. The company wants to prefer the Direct Connect path. What configuration achieves this?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure the Direct Connect BGP session with a higher local preference (e.g., 200) than the VPN BGP session.
Option A is correct because AWS assigns a local preference of 100 by default to Direct Connect routes, while VPN routes have a lower local preference (e.g., 0 or lower). Option B is wrong because AS path prepending on the Direct Connect side would make it less preferred. Option C is wrong because the MED is not commonly used in this scenario; local preference is standard. Option D is wrong because the VPN should have higher AS path prepending to be less preferred.
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.
✗
Set the Multi-Exit Discriminator (MED) on the VPN advertisement to a lower value.
Why it's wrong here
Lower MED makes route more preferred, opposite of desired.
✗
Prepend the AS path on the Direct Connect advertisement to make it longer.
Why it's wrong here
Longer AS path makes route less preferred.
✓
Configure the Direct Connect BGP session with a higher local preference (e.g., 200) than the VPN BGP session.
Why this is correct
Higher local preference makes Direct Connect preferred.
Related concept
Static NAT maps one inside address to one outside address.
✗
Configure the VPN BGP session with a higher local preference than the Direct Connect session.
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 healthcare organisation deploys an application with a public-facing web tier and a private database tier. The database subnet has no public IP and only accepts connections from the web tier's security group. Questions like this test whether you can design cloud network isolation using VNets/VPCs, subnets, and security group rules.
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: Configure the Direct Connect BGP session with a higher local preference (e.g., 200) than the VPN BGP session. — Option A is correct because AWS assigns a local preference of 100 by default to Direct Connect routes, while VPN routes have a lower local preference (e.g., 0 or lower). Option B is wrong because AS path prepending on the Direct Connect side would make it less preferred. Option C is wrong because the MED is not commonly used in this scenario; local preference is standard. Option D is wrong because the VPN should have higher AS path prepending to be less preferred.
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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