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300-410 Practice Question: Which TWO statements about BGP route reflectors…
Which TWO statements about BGP route reflectors are true? (Choose TWO.)
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
✓
A route reflector adds its own cluster ID to the cluster-list attribute when reflecting a route.
Route reflectors (RRs) are used to reduce IBGP full mesh. They reflect routes from clients and non-clients, but with specific rules to prevent loops. An RR does not modify the AS_PATH or NEXT_HOP by default. The 'cluster-list' attribute is used to detect loops. When an RR receives a route from a non-client, it reflects it only to clients, not to other non-clients. The 'originator-id' attribute is set by the RR to the router ID of the originator.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
A route reflector modifies the NEXT_HOP attribute to its own address when reflecting routes.
Why it's wrong here
Incorrect. Route reflectors do not change the NEXT_HOP attribute unless explicitly configured with 'next-hop-self'.
- ✓
A route reflector adds its own cluster ID to the cluster-list attribute when reflecting a route.
Why this is correct
Correct. The RR adds its cluster ID to the cluster-list to prevent loops in hierarchical RR deployments.
- ✗
A route reflector reflects routes received from a non-client to all other non-clients.
Why it's wrong here
Incorrect. An RR reflects routes from a non-client only to clients, not to other non-clients.
- ✓
A route reflector reflects routes received from a client to all clients and non-clients.
Why this is correct
Correct. Routes from a client are reflected to all other clients and non-clients.
- ✗
A route reflector always sets the originator-id attribute to the router ID of the route reflector.
Why it's wrong here
Incorrect. The originator-id is set to the router ID of the originator of the route, not the RR.
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Variation 1. Which TWO statements about BGP route reflectors are true when troubleshooting route propagation issues? (Choose TWO.)
medium- ✓ A.A route reflector forwards routes received from a non-client peer to all client and non-client peers.
- B.A route reflector appends its own AS number to the AS_PATH when reflecting routes.
- ✓ C.The cluster ID is used to prevent routing loops within a route reflector cluster.
- D.Clients in a route reflector cluster must be fully meshed with each other.
- E.A route reflector changes the next-hop attribute to its own address when reflecting routes.
Why A: Route reflectors pass routes from non-client peers to all other peers (including other clients and non-clients) without requiring full mesh, but they do not modify the AS_PATH. The cluster ID is used to prevent loops within a cluster. Option B is incorrect because route reflectors do not prepend the AS_PATH. Option D is incorrect because clients must peer only with the route reflector, not with each other. Option E is incorrect because the next-hop is not changed by default.
JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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