Which types of prefixes will a router running BGP most likely advertise to an IBGP peer, assuming it is not configured as a route reflector?

Question

Options

• Aprefixes received from any other BGP peer and prefixes locally originated via network statements or
• Ball prefixes in its routing table
• Cprefixes received from EBGP peers and prefixes locally originated via network statements or
• Dprefixes received from EBGP peers and prefixes received from route reflectors
• Eprefixes received from other IBGP peers, prefixes received from EBGP peers, and prefixes
• Fprefixes received from other IBGP peers and prefixes received from route reflectors

• B
  4% (1)
• C
  78% (21)
• D
  7% (2)
• F
  11% (3)

Explanation

If your autonomous system will be passing traffic through it from another autonomous system to a third autonomous system, it is very important that your autonomous system be consistent about the routes that it advertises. For example, if your BGP were to advertise a route before all routers in your network had learned about the route through your IGP, your autonomous system could receive traffic that some routers cannot yet route. To prevent this from happening, BGP must wait until the IGP has propagated routing information across your autonomous system. This causes BGP to be synchronized with the IGP. Synchronization is enabled by default.

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