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?
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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