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Question 63 - JN0-280 discussion

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By default, which two statements are correct about BGP advertisements? (Choose two.)

A.

BGP peers advertise routes received from EBGP peers to other IBGP peers.

Answers
A.

BGP peers advertise routes received from EBGP peers to other IBGP peers.

B.

BGP peers advertise routes received from IBGP peers to other IBGP peers.

Answers
B.

BGP peers advertise routes received from IBGP peers to other IBGP peers.

C.

BGP peers advertise routes from EBGP peers to other IBGP peers using its own address as the next hop.

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C.

BGP peers advertise routes from EBGP peers to other IBGP peers using its own address as the next hop.

D.

BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.

Answers
D.

BGP peers advertise routes from IBGP peers to EBGP peers using its own address as the next hop.

Suggested answer: A, D

Explanation:

BGP (Border Gateway Protocol) has specific rules for route advertisement between peers.

Step-by-Step Breakdown:

EBGP to IBGP Route Propagation:

BGP peers advertise routes learned from EBGP peers to IBGP peers within the same AS. This ensures that routes learned from external networks are propagated internally within the AS.

IBGP to EBGP Route Propagation:

Routes learned from IBGP peers can be advertised to EBGP peers, but when advertising these routes, the router uses its own IP address as the next hop.

IBGP Split Horizon:

By default, IBGP peers do not advertise routes learned from one IBGP peer to another IBGP peer. This rule (IBGP split horizon) prevents routing loops within an AS.

Juniper

Reference:

BGP Advertisement Rules: Junos adheres to BGP standards, where IBGP peers do not propagate routes to other IBGP peers, but EBGP peers receive IBGP routes with the advertising router as the next hop.

asked 10/10/2024
Timothy Brown
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