hardMultiple ChoiceObjective-mapped
300-410 R1 and R2 are iBGP peers in AS 65001 Practice Question
R1 and R2 are iBGP peers in AS 65001. R1 has: neighbor 10.1.1.2 route-reflector-client. R2 advertises a prefix 10.0.0.0/8 with a community of no-export. R1 reflects this prefix to its other client R3. R3 is in a different AS (65002) via eBGP. R3 receives the prefix but does not advertise it to its eBGP neighbor R4 in AS 65003. What is the root 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 no-export community on the prefix prevents R3 from advertising it to eBGP neighbor R4.
The community no-export attached to the prefix prevents it from being advertised to any eBGP peers. When R1 reflects the prefix to R3 (iBGP), the community is preserved. R3, upon advertising to R4 (eBGP), checks the community and withholds the advertisement because of the no-export community. The root cause is that the no-export community is present on the prefix, which blocks eBGP advertisement.
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 no-export community on the prefix prevents R3 from advertising it to eBGP neighbor R4.
Why this is correct
no-export community means the route should not be advertised to any eBGP peers.
- ✗
R1 should have stripped the community before reflecting to R3.
Why it's wrong here
Route reflectors do not modify communities by default.
- ✗
R3 is missing the send-community command to its eBGP neighbor.
Why it's wrong here
The community is already present; the issue is that it blocks advertisement.
- ✗
The route-reflector-client command on R1 should be on R2 instead.
Why it's wrong here
That would not affect the community behavior.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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