- A
Set a higher MED value on the VPN BGP advertisements.
Why wrong: MED is used for inbound route selection.
- B
Prepend AS_PATH on the VPN BGP advertisements to make them less preferred.
Why wrong: AS_PATH prepending affects inbound routes, not outbound.
- C
Apply BGP community tags from Direct Connect to set a higher local preference.
AWS uses BGP community tags to influence local preference.
- D
Configure BFD on both Direct Connect and VPN interfaces.
Why wrong: BFD detects failures but does not control route preference.
Question 1,083 of 1,705
ANS-C01 Network Management and Operations Practice Question
This ANS-C01 practice question tests your understanding of network management and operations. The scenario asks you to isolate a root cause — eliminate options that address a different problem before choosing. 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 uses AWS Direct Connect and VPN as backup. They have a Transit Gateway with multiple VPC attachments. The network engineer wants to ensure that traffic uses Direct Connect when available and fails over to VPN. Which configuration should be applied?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Apply BGP community tags from Direct Connect to set a higher local preference.
Option C is correct because AWS Direct Connect can apply BGP community tags that allow you to set a higher local preference for routes learned via Direct Connect compared to VPN routes. This ensures traffic prefers Direct Connect when available. Option A is incorrect because MED is used for influencing inbound route selection from multiple AS paths, not for preferring Direct Connect over VPN. Option B is incorrect because AS_PATH prepending affects how routes are advertised to neighbors, not how they are preferred locally. Option D is incorrect because BFD (Bidirectional Forwarding Detection) provides fast failure detection but does not influence route preference; it would be used in conjunction with routing policies, not as a standalone solution.
Key principle: OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 MED value on the VPN BGP advertisements.
Why it's wrong here
MED is used for inbound route selection.
- ✗
Prepend AS_PATH on the VPN BGP advertisements to make them less preferred.
Why it's wrong here
AS_PATH prepending affects inbound routes, not outbound.
- ✓
Apply BGP community tags from Direct Connect to set a higher local preference.
- ✗
Configure BFD on both Direct Connect and VPN interfaces.
Why it's wrong here
BFD detects failures but does not control route preference.
Common exam traps
Common exam trap: OSPF can fail even when IP connectivity looks correct
OSPF neighbour formation depends on matching areas, timers, network type, authentication and passive-interface behaviour. Do not choose an answer only because the devices can ping.
Detailed technical explanation
How to think about this question
OSPF questions usually test the details that control adjacency and route selection. Read the neighbour state, area, router ID and interface configuration before deciding what is wrong.
KKey Concepts to Remember
- OSPF neighbours must agree on key parameters.
- Router ID selection can affect neighbour relationships and LSDB output.
- OSPF cost influences the preferred path.
- A route can appear in OSPF information but not become the installed route.
TExam Day Tips
- Check area mismatch first when OSPF adjacency fails.
- Review passive interfaces when a network is advertised but no neighbour forms.
- Use show ip ospf neighbor and show ip route clues carefully.
Key takeaway
OSPF neighbour adjacency depends on matching area, hello/dead timers, network type, and authentication — IP reachability alone is not enough.
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 OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related ANS-C01 OSPF questions on adjacency and route selection.
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FAQ
Questions learners often ask
What does this ANS-C01 question test?
Network Management and Operations — This question tests Network Management and Operations — OSPF neighbours must agree on key parameters..
What is the correct answer to this question?
The correct answer is: Apply BGP community tags from Direct Connect to set a higher local preference. — Option C is correct because AWS Direct Connect can apply BGP community tags that allow you to set a higher local preference for routes learned via Direct Connect compared to VPN routes. This ensures traffic prefers Direct Connect when available. Option A is incorrect because MED is used for influencing inbound route selection from multiple AS paths, not for preferring Direct Connect over VPN. Option B is incorrect because AS_PATH prepending affects how routes are advertised to neighbors, not how they are preferred locally. Option D is incorrect because BFD (Bidirectional Forwarding Detection) provides fast failure detection but does not influence route preference; it would be used in conjunction with routing policies, not as a standalone solution.
What should I do if I get this ANS-C01 question wrong?
Review OSPF neighbour requirements — matching area type, hello and dead timers, network type, stub flags, and authentication. Study show ip ospf neighbor states (INIT, 2-WAY, FULL). Then practise related ANS-C01 OSPF questions on adjacency and route selection.
What is the key concept behind this question?
OSPF neighbours must agree on key parameters.
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Last reviewed: Jun 20, 2026
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