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Ericsson Exam ECP-206 Topic 4 Question 25 Discussion

Actual exam question for Ericsson's ECP-206 exam
Question #: 25
Topic #: 4
[All ECP-206 Questions]

Which mismatched field would cause an IS-IS adjacency between two routers to fail?

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Suggested Answer: A

MTU mismatch would cause an IS-IS adjacency between two routers to fail. MTU stands for maximum transmission unit, which is the maximum size of a packet that can be transmitted on a link. IS-IS hellos are padded to the full MTU size, partly to allow a router to implicitly communicate its MTU to its neighbors.If two routers have different MTUs on their interfaces, they will not be able to exchange hellos properly, and their adjacency will not form or will be dropped34. To solve this problem, the MTUs on both interfaces must be configured to match.

SEL, context, and SysID are not fields that would cause an IS-IS adjacency failure. SEL stands for selector, which is a one-octet field that identifies the network layer service to which a packet should be sent.For IS-IS routers, the SEL must always be 005.Context is not a field in IS-IS packets, but rather a term used to describe the scope of routing information in different levels or areas6. SysID stands for system identifier, which is a six-octet field that uniquely identifies a router within an area.SysID does not have to match between two routers for them to form an adjacency7.


by Tarra at Aug 28, 2024, 04:09 AM

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Stephen
10 months ago
I think SysID is also important for identifying the router, so that could be a potential mismatch causing the adjacency to fail.
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Benedict
10 months ago
MTU all the way! I once had a colleague who thought changing the MTU would make the network 'go faster'. Needless to say, we had to roll back that change pretty quickly.
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Mose
10 months ago
B) SEL
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Emogene
10 months ago
Oh no, changing the MTU can definitely cause issues with IS-IS adjacencies.
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Casie
10 months ago
A) MTU
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Laurene
11 months ago
Gotta be the Context field. I mean, who even uses that anyway? Sounds like something straight out of a networking trivia game.
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Flo
10 months ago
Definitely, it's not a common field to come across in networking.
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Nana
10 months ago
Yeah, I agree. Context seems like the odd one out here.
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Wendell
10 months ago
D) SysID
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Ernie
10 months ago
C) Context
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Blair
10 months ago
B) SEL
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Annmarie
10 months ago
A) MTU
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Lenna
11 months ago
But MTU affects the maximum size of packets that can be transmitted, so it seems like a critical field to match.
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Lorrine
11 months ago
SysID, for sure. Can't have two routers with the same system ID, that's just asking for trouble. Although, I did once work with a team that thought changing the SysID was a good way to 'optimize' the network. Needless to say, that didn't end well.
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Hannah
11 months ago
I disagree, I believe it's Context that would cause the adjacency to fail.
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Florinda
11 months ago
Definitely the MTU! I learned that one the hard way during a network troubleshooting session. Reminds me of the time I accidentally set the MTU to 1400 on a link - instant connectivity loss!
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Wilda
10 months ago
B) SEL
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Elfrieda
10 months ago
Oh no, that must have been frustrating!
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Leatha
10 months ago
A) MTU
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Lenna
11 months ago
I think the mismatched field that would cause an IS-IS adjacency to fail is MTU.
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