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Question 2 - JN0-280 discussion

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Exhibit:

Referring to the exhibit, which two statements are correct about default BGP advertisements? (Choose two.)

A.

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.

Answers
A.

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router2.

B.

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.

Answers
B.

When routes advertised by router2 are received by the SP router, they will contain the next-hop address of router1.

C.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.

Answers
C.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of the SP router.

D.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

Answers
D.

When routes advertised by the SP router are received by router2, they will contain the next-hop address of router1.

Suggested answer: B, D

Explanation:

The exhibit shows a BGP peering scenario between three routers: router1 and router2 are part of the same AS (AS65000), while the SP router is in a different AS (AS65101). This indicates an EBGP (External BGP) peering between the SP router and router1, and IBGP between router1 and router2.

Step-by-Step Breakdown:

Next-Hop Behavior in BGP:

IBGP: In IBGP, the next-hop address is not modified when advertising routes within the same AS. Thus, when router1 advertises routes learned from router2 to the SP router, it will keep the next-hop address of router1, not router2.

EBGP: In EBGP, the next-hop address is modified. When router1 receives routes from the SP router, it will advertise them to router2 with the next-hop address of router1.

Route Propagation:

Routes received by router1 from router2 will be advertised to the SP router with router1 as the next hop.

Similarly, routes advertised by the SP router will be passed on to router2, with router1 remaining as the next hop.

Juniper

Reference:

BGP Next-Hop: Juniper's BGP implementations follow standard BGP next-hop behavior, where the next-hop is modified in EBGP but not in IBGP, ensuring proper route advertisement across autonomous systems.

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asked 10/10/2024
Luyanda Hatta
34 questions
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