ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. 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.
A network engineer is designing a hybrid network with AWS Direct Connect and a VPN backup. The company has multiple VPCs connected to an AWS Transit Gateway. The on-premises network advertises the same prefixes over both Direct Connect (via private VIF) and VPN (via BGP). The engineer wants to ensure that traffic from the VPCs to on-premises prefers the Direct Connect path. What should the engineer do?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Configure AS path prepending on the VPN BGP advertisements from on-premises
Option A is correct because adjusting the AS path prepending length makes the VPN path appear longer (less preferred) in BGP route selection. Option B is incorrect because MED is only compared between routes from the same AS. Option C is incorrect because local preference is used within a single AS, not across ASes. Option D is incorrect because decreasing the AS path length would make the path more 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 a higher local preference on the Transit Gateway for Direct Connect routes
Why it's wrong here
Local preference is not propagated across BGP peers.
✗
Decrease the AS path length on the Direct Connect BGP advertisements
Why it's wrong here
Decreasing AS path makes Direct Connect more preferred, but the question asks for VPN backup preference.
✓
Configure AS path prepending on the VPN BGP advertisements from on-premises
Why this is correct
Longer AS path makes the VPN route less preferred.
Related concept
Static NAT maps one inside address to one outside address.
✗
Set a higher MED on the Direct Connect BGP advertisements
Why it's wrong here
MED is compared only between routes from the same neighbor AS.
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 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 Management and Operations — This question tests Network Management and Operations — Static NAT maps one inside address to one outside address..
What is the correct answer to this question?
The correct answer is: Configure AS path prepending on the VPN BGP advertisements from on-premises — Option A is correct because adjusting the AS path prepending length makes the VPN path appear longer (less preferred) in BGP route selection. Option B is incorrect because MED is only compared between routes from the same AS. Option C is incorrect because local preference is used within a single AS, not across ASes. Option D is incorrect because decreasing the AS path length would make the path more 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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