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Question 36 - JN0-280 discussion

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Which two statements are correct about rules for EBGP and IBGP? (Choose two.)

A.

EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.

Answers
A.

EBGP peers have a TTL of 1, while IBGP peers have a TTL of 255.

B.

EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.

Answers
B.

EBGP peers have a TTL of 255, while IBGP peers have a TTL of 1.

C.

EBGP routes are more preferred than IBGP routes.

Answers
C.

EBGP routes are more preferred than IBGP routes.

D.

IBGP routes are more preferred than EBGP routes.

Answers
D.

IBGP routes are more preferred than EBGP routes.

Suggested answer: A, C

Explanation:

EBGP (External BGP) and IBGP (Internal BGP) operate with different rules due to the nature of their relationships.

Step-by-Step Breakdown:

TTL Differences:

EBGP: By default, EBGP peers have a TTL of 1, meaning they must be directly connected, or the TTL needs to be manually increased for multihop EBGP.

IBGP: IBGP peers within the same AS have a TTL of 255, as they are expected to communicate over multiple hops within the AS.

Preference for EBGP Routes:

Routes learned via EBGP are typically preferred over IBGP routes. This is because EBGP routes are considered more reliable since they originate outside the AS, while IBGP routes are internal.

Juniper

Reference:

BGP Configuration: The different handling of TTL and route preferences between EBGP and IBGP ensures proper route selection and security within Junos-based networks.

asked 10/10/2024
SERGIO FREITAS
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