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Question 1 - JN0-280 discussion

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Which two statements about IBGP are correct? (Choose two.)

A.

By default, IBGP has a TTL of 1.

Answers
A.

By default, IBGP has a TTL of 1.

B.

IBGP uses AS path for loop prevention.

Answers
B.

IBGP uses AS path for loop prevention.

C.

By default, IBGP has a TTL of 255.

Answers
C.

By default, IBGP has a TTL of 255.

D.

IBGP uses full mesh for loop prevention.

Answers
D.

IBGP uses full mesh for loop prevention.

Suggested answer: C, D

Explanation:

IBGP (Internal Border Gateway Protocol) is used to exchange routing information between routers within the same AS (Autonomous System).

Step-by-Step Breakdown:

TTL of 255:

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 configuration.

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.

Juniper

Reference:

IBGP Full Mesh: Juniper recommends using route reflectors in large networks to simplify IBGP full-mesh requirements.

asked 10/10/2024
Alessandro Cristofori
39 questions
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