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ANS-C01 Network Management and Operations Practice Question

A company uses AWS Transit Gateway to connect multiple VPCs and an on-premises network via Direct Connect. The on-premises network can reach some VPCs but not others. All VPCs are attached to the same Transit Gateway. What should the engineer check first?

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

✓

The Transit Gateway route tables and associations.

The Transit Gateway route tables control which VPCs and attachments can communicate. If some VPCs are in a different route table or if propagation is not configured, traffic may not be routed correctly.

Answer analysis

Option-by-option breakdown

For each option: why learners choose it and why it is or isn't the right answer here.

  • ✗

    The VPC flow logs for the unreachable VPCs.

    Why it's wrong here

    Flow logs show traffic, but the root cause is likely routing at the Transit Gateway level.

  • ✓

    The Transit Gateway route tables and associations.

    Why this is correct

    Route tables determine the connectivity between attachments; misconfiguration is the likely cause.

  • ✗

    The Direct Connect virtual interface status.

    Why it's wrong here

    If some VPCs are reachable, the VIF is working.

  • ✗

    The BGP session between the on-premises router and the Direct Connect router.

    Why it's wrong here

    BGP is likely up since some VPCs are reachable.

About these practice questions

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JA

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.