ANS-C01 Network Management and Operations Practice Question
A company is experiencing intermittent connectivity issues between a VPC and an on-premises data center over an AWS Direct Connect connection. The network engineer checks the Direct Connect virtual interface status and sees it is 'up'. However, BGP sessions are flapping. Which action should the engineer take to diagnose the issue?
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
✓
Check the BGP keepalive and hold timers on both sides.
BGP session flapping is often caused by mismatched keepalive or hold timers between the customer router and AWS. Checking and aligning these timers helps diagnose and resolve the flapping. Option A is incorrect because the virtual interface is already up, indicating VLAN configuration is likely correct. Option B is incorrect; BFD is used for faster failure detection, not for diagnosing timer mismatches that cause flapping. Option C is excessive; recreating the virtual interface with a new VLAN ID is unnecessary when the issue is BGP-related.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Verify the VLAN configuration on the customer router.
Why it's wrong here
VLAN mismatch would keep the interface down, not cause BGP flapping.
- ✗
Enable BFD on the Direct Connect virtual interface.
Why it's wrong here
BFD would detect failures faster but not diagnose existing flapping.
- ✗
Recreate the virtual interface with a new VLAN ID.
Why it's wrong here
Recreating is disruptive and may not resolve BGP timer issues.
- ✓
Check the BGP keepalive and hold timers on both sides.
Why this is correct
Inconsistent BGP timers can cause session flapping.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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