ANS-C01 Network Management and Operations Practice Question
A company uses AWS Direct Connect to connect its on-premises data center to AWS. The network engineer is troubleshooting connectivity issues and notices that the BGP session between the on-premises router and the AWS Direct Connect virtual interface is down. The engineer has verified the physical connectivity and the VLAN configuration. What should the engineer check next?
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
✓
Confirm that the BGP ASN configured on the on-premises router matches the one provided by AWS.
Correct answer is C. BGP session establishment requires matching BGP ASN on both sides; if they don't match, the session fails. Option A is incorrect because the virtual interface type (private or public) does not prevent BGP from coming up; it affects routing scope. Option B is incorrect because the route size advertised does not affect the BGP session itself; AWS accepts routes of any size within limits. Option D is incorrect because the VPC CIDR is used for routing, but not for BGP session establishment; the session can be up even if no routes are propagated.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Ensure the virtual interface type is set to 'public'.
Why it's wrong here
Incorrect: Virtual interface type does not directly affect BGP session state.
- ✗
Verify that the on-premises router is advertising a CIDR block smaller than /24.
Why it's wrong here
Incorrect: CIDR size is not a BGP session requirement.
- ✓
Confirm that the BGP ASN configured on the on-premises router matches the one provided by AWS.
Why this is correct
Correct: BGP ASN mismatch prevents session establishment.
- ✗
Check the VPC CIDR range in the route table.
Why it's wrong here
Incorrect: VPC CIDR is not used for BGP peering.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This ANS-C01 practice question is part of Courseiva's free Amazon Web Services certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the ANS-C01 exam.