JN0-281 · Question #56
Which two statements about IBGP are correct? (Choose two.)
The correct answer is C. By default, IBGP has a TTL of 255. D. IBGP uses full mesh for loop prevention. IBGP (Internal Border Gateway Protocol) is used to exchange routing information between routers within the same AS (Autonomous System). By default, IBGP sessions are established with a TTL (Time to Live) value of 255. This allows IBGP neighbors to communicate over multiple hops…
Question
Which two statements about IBGP are correct? (Choose two.)
Options
- ABy default, IBGP has a TTL of 1.
- BIBGP uses AS path for loop prevention.
- CBy default, IBGP has a TTL of 255.
- DIBGP uses full mesh for loop prevention.
How the community answered
(32 responses)- A6% (2)
- B3% (1)
- C91% (29)
Explanation
IBGP (Internal Border Gateway Protocol) is used to exchange routing information between routers within the same AS (Autonomous System). By default, IBGP sessions are established with a TTL (Time to Live) value of 255. This allows IBGP neighbors to communicate over multiple hops within the AS without requiring any additional Full Mesh Requirement: IBGP requires a logical full mesh between all IBGP routers to ensure that routing information is fully distributed within the AS. Since IBGP does not propagate routes learned from one IBGP peer to another by default, a full mesh topology is needed unless route reflectors or BGP confederations are used.
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