BGP interview questions worth investigating.
Go beyond definitions: explain why a prefix is present in one table and absent from another.
A peer is reachable, but no routes arrive. Why?
Direct IP reachability is only one prerequisite. Compare the local AS and configured remote AS at both ends. Then distinguish an established peer with nothing to advertise from a peer that never forms.
Connected does not mean advertised
A service subnet can exist in a router's local table without being originated into BGP. Inspect the origination policy and exact prefix rather than assuming every connected route is exported.
Show your method
State what each command would prove, predict its output, then update your hypothesis. These exercises reflect common industry competencies and are not questions from a particular company's interview bank.
Protocol reference: BGP route exchange and selection — RFC 4271.
The silent peering
Boston edge. Two transit stages separate the branch from its service gateway. Direct uplink connectivity works, but remote routers no longer learn either service prefix from the service edge. Investigate the two service networks from R1: 10.201.96.0/24 to 10.201.102.0/24 (TCP/443), and 10.201.97.0/24 to 10.201.103.0/24 (TCP/8443).
Link addressing (3)
- R1 R2
10.201.112.0/30 - R2 R3
10.201.113.0/30 - R3 R4
10.201.114.0/30
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