H12-821_V1.0 Exam Dumps | On a broadcast IS-IS network, a DIS needs to be elected to create and update pseudonodes. Which of the

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Question 86/107

On a broadcast IS-IS network, a DIS needs to be elected to create and update pseudonodes. Which of the following values is the default DIS priority of an IS-IS interface?

A. 200

B. 64

C. 1

D. 100

Correct Answer: B

Comprehensive and Detailed in-depth Step-by-Step Explanation:In an Intermediate System to Intermediate System (IS-IS) network, a Designated Intermediate System (DIS) is elected on broadcast networks to perform the following functions:
* Represent the broadcast network as a pseudonode.
* Generate and update the Link State Protocol Data Units (LSPs) for the pseudonode.
The DIS is elected based on the DIS priority value, which is configured on IS-IS interfaces. If two routers have the same priority, the router with the higher MAC address becomes the DIS.
The default DIS priority for IS-IS interfaces is 64, which can be modified depending on the network requirements.
* Option A (200): Incorrect. This is not the default value.
* Option B (64): Correct. This is the default DIS priority value.
* Option C (1): Incorrect. This is not the default value.
* Option D (100): Incorrect. This is not the default value.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "IS-IS Basics".
* RFC 1195 - Use of OSI IS-IS for Routing in TCP/IP and Dual Environments.

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