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 network engineer is designing a hybrid network with Direct Connect and VPN backup. The company has multiple VPCs connected via Transit Gateway. They want to use BGP to exchange routes. Which BGP feature should be configured to fail over from Direct Connect to VPN if the Direct Connect link goes down?
BGP communities
AWS uses BGP community tags to set local preference and control route priority.
Multi-Exit Discriminator (MED)
Why wrong: MED influences inbound routes from AS to AS, not outbound preference.
Bidirectional Forwarding Detection (BFD)
Why wrong: BFD detects failures but does not influence route preference.
AS_PATH prepending
Why wrong: AS_PATH prepending influences inbound route selection, not outbound.
Answer choices
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
BGP communities
Option C is correct because BGP communities allow controlling route preference; AWS uses community tags to influence route priority. Option A is wrong because BFD detects failures faster but does not control preference. Option B is wrong because AS_PATH prepending is used to influence inbound routes, not outbound. Option D is wrong because MED is used to influence inbound routes.
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
For each option: why learners choose it and why it is or isn't the right answer here.
BGP communities
Multi-Exit Discriminator (MED)
Why it's wrong here
MED influences inbound routes from AS to AS, not outbound preference.
Bidirectional Forwarding Detection (BFD)
Why it's wrong here
BFD detects failures but does not influence route preference.
AS_PATH prepending
Why it's wrong here
AS_PATH prepending influences inbound route selection, not outbound.
Common exam traps
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
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.
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
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
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.
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FAQ
Network Management and Operations — This question tests Network Management and Operations — Static NAT maps one inside address to one outside address..
The correct answer is: BGP communities — Option C is correct because BGP communities allow controlling route preference; AWS uses community tags to influence route priority. Option A is wrong because BFD detects failures faster but does not control preference. Option B is wrong because AS_PATH prepending is used to influence inbound routes, not outbound. Option D is wrong because MED is used to influence inbound routes.
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.
Static NAT maps one inside address to one outside address.
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Last reviewed: Jun 20, 2026
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