H12-821_V1.0 Exam Dumps | A network entity title consists of an area address and a system ID. It is a special NSAP (the SEL has

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Question 59/107

A network entity title consists of an area address and a system ID. It is a special NSAP (the SEL has a fixed value of 00) and is mainly used for route calculation.

A. TRUE

B. FALSE

Correct Answer: A

Comprehensive and Detailed in-depth Step-by-Step Explanation:The Network Entity Title (NET) is a unique identifier assigned to an IS-IS router. It is derived from the Network Service Access Point (NSAP) address and consists of the following components:
* Area Address:
* Identifies the area in which the router resides.
* Multiple routers in the same IS-IS area must have the same area address.
* System ID:
* Uniquely identifies the router within the IS-IS area.
* The System ID is typically derived from the router's loopback IP address or another unique value.
* SEL (Selector Field):
* The SEL field is always set to 00 for IS-IS NETs.
The NET is used by IS-IS for route calculation and to identify the router within the IS-IS domain. Therefore, the statement is TRUE.
References:
* Huawei HCIA-Datacom Study Guide, Chapter on "IS-IS Addressing".
* RFC 1195 - Use of OSI IS-IS for Routing in TCP/IP and Dual Environments.

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