ANS-C01 Network Management and Operations Practice Question
A company has a hybrid network with multiple AWS Direct Connect connections to different VPCs. The on-premises network uses BGP to advertise prefixes to AWS. The network team notices that some on-premises prefixes are not being received by the VPCs. 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 on-premises router is advertising more than 100 prefixes over the BGP session
AWS Direct Connect virtual interfaces have a default limit of 100 allowed prefixes. If the on-premises router advertises more than 100 prefixes, BGP will reject the excess routes, causing some prefixes not to be received. Option B is incorrect because BGP communities are optional tags and not required for prefix advertisement. Option C is incorrect because AS_PATH prepending influences route preference but does not prevent advertisement. Option D is incorrect because the MED attribute affects path selection, not the ability to advertise prefixes.
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 on-premises router is advertising more than 100 prefixes over the BGP session
Why this is correct
AWS limits the number of prefixes per BGP session to 100 by default. Exceeding this causes rejection.
- ✗
The on-premises router is not using BGP communities
Why it's wrong here
BGP communities are optional attributes.
- ✗
The on-premises router is using AS_PATH prepending
Why it's wrong here
AS_PATH prepending influences path selection, not advertisement.
- ✗
The on-premises router is not setting the MED attribute
Why it's wrong here
MED is optional and not required for prefix advertisement.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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