350-501 Networking Practice Question
A service provider uses BGP route reflectors to scale iBGP. A route reflected from a route reflector arrives at a client with the originator-id set. What is the purpose of the originator-id attribute?
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
✓
To prevent routing loops by ensuring the route is not accepted if the originator-id matches the local router-id
The originator-id is set by the route reflector to the router-id of the originating router in the AS. It prevents routing loops by allowing a route to be ignored if the originator-id matches the receiving router's ID.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
To identify the route reflector that reflected the route
Why it's wrong here
The originator-id identifies the original advertiser, not the reflector.
- ✗
To indicate the cluster-id of the route reflector
Why it's wrong here
Cluster-id is a separate attribute used for loop prevention in route reflector clusters.
- ✓
To prevent routing loops by ensuring the route is not accepted if the originator-id matches the local router-id
Why this is correct
Correct; if a router receives a route with its own router-id as originator-id, it discards the route.
- ✗
To carry the next-hop information for IPv6 prefixes
Why it's wrong here
Originator-id is unrelated to next-hop.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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