ANS-C01 Network Management and Operations Practice Question
A company has a Direct Connect connection with a private VIF attached to a Direct Connect Gateway. The Direct Connect Gateway is associated with a Transit Gateway. The on-premises network advertises a prefix via BGP, but the prefix does not appear in the Transit Gateway route table. What is the most likely cause?
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 prefix is not included in the allowed prefixes list for the Direct Connect Gateway.
The Direct Connect Gateway has an allowed prefixes list that filters which BGP prefixes are accepted from the on-premises network. If the prefix is not in that list, it will not be propagated to the Transit Gateway route table. Option A is incorrect because route propagation on the Transit Gateway route table is used for VPC attachments, not for Direct Connect prefixes. Option B is incorrect because BGP community attributes are used for tagging and influencing routing policies, not as a prerequisite for prefix acceptance. Option C is incorrect because the Transit Gateway association with the Direct Connect Gateway is already present as stated in the question, so this cannot be the cause.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Route propagation is not enabled on the Transit Gateway route table.
Why it's wrong here
Route propagation is for VPC attachments, not for Direct Connect.
- ✗
The on-premises router is not sending the BGP community attribute.
Why it's wrong here
BGP communities are optional and not required for prefix acceptance.
- ✗
The Transit Gateway is not associated with the Direct Connect Gateway.
Why it's wrong here
The association exists; otherwise no prefixes would be learned.
- ✓
The prefix is not included in the allowed prefixes list for the Direct Connect Gateway.
Why this is correct
The allowed prefixes list controls which BGP prefixes are accepted.
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