350-501 Networking Practice Question
A service provider is implementing BGP route reflectors to scale iBGP. Which THREE mechanisms are used to prevent routing loops in a route reflector topology? (Choose three.)
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
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CLUSTER_LIST
BGP route reflectors use several attributes to prevent loops: CLUSTER_LIST (cluster-id list), ORIGINATOR_ID (original router's RID), and the standard AS_PATH loop detection. Also, the route reflector does not reflect routes back to the client that sent it.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
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MED comparison
Why it's wrong here
MED is used for path selection, not loop prevention.
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CLUSTER_LIST
Why this is correct
Correct. CLUSTER_LIST tracks clusters to prevent loops.
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ORIGINATOR_ID
Why this is correct
Correct. ORIGINATOR_ID prevents loops by identifying the origin.
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AS_PATH loop detection
Why this is correct
Correct. AS_PATH is still checked for loops.
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NEXT_HOP loop detection
Why it's wrong here
NEXT_HOP is not used for loop prevention in this context.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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