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Question 9 - JN0-280 discussion

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Which state in the adjacency process do OSPF routers check the MTU size?

A.

Init

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A.

Init

B.

Exchange

Answers
B.

Exchange

C.

Done

Answers
C.

Done

D.

ExStart

Answers
D.

ExStart

Suggested answer: B

Explanation:

In OSPF, routers exchange link-state information in different stages to establish full adjacency. The MTU size is checked during the Exchange state.

Step-by-Step Breakdown:

OSPF Adjacency Process:

OSPF routers go through multiple stages when forming an adjacency: Down, Init, 2-Way, ExStart, Exchange, Loading, and Full.

Exchange State:

During the Exchange state, OSPF routers exchange Database Description (DBD) packets to describe their link-state databases. The MTU size is checked at this stage to ensure both routers can successfully exchange these packets without fragmentation.

If there is an MTU mismatch, the routers may fail to proceed past the Exchange state.

Juniper

Reference:

MTU Checking in OSPF: Junos uses the Exchange state to check for MTU mismatches, ensuring that routers can properly exchange database information without packet fragmentation issues.

asked 10/10/2024
Felipe Santos Cardoso
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