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Question 24 - JN0-351 discussion

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Which two BGP attributes must be supported by all BGP implementations and must be included in every update? (Choose two.)

A.
AS path
Answers
A.
AS path
B.
MED
Answers
B.
MED
C.
next hop
Answers
C.
next hop
D.
community
Answers
D.
community
Suggested answer: A, C

Explanation:

BGP attributes are properties that BGP uses for route advertisement, path selection, and loop prevention1.There are four categories of BGP attributes123:

Well-known mandatory: Must be recognized by all BGP routers, present in all BGP updates, and passed on to other BGP routers123.

Well-known discretionary: Supported by all BGP implementations, and are optionally included in BGP updates1.

Optional transitive: May not be supported by all implementations of BGP1.

Optional non-transitive: May not be supported by all implementations of BGP1.

The well-known mandatory attributes must be supported by all BGP implementations and must be included in every update123.These include the AS path and next hop attributes23. Therefore, options A and C are correct.

asked 18/09/2024
Han Valk
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