On an IS-IS network, the length and components of a NET are the same as those of an NSAP . Which of the following NET fields is used to uniquely identify a host or router in an area?
NET (Network Entity Title) is a special form of NSAP (Network Service Access Point) used in IS-IS routing .
NET consists of three fields :
AFI (Authority and Format Identifier) + IDI (Initial Domain Identifier) + Area Address → Identifies the area .
System ID → Uniquely identifies a router within an area (similar to an OSPF Router ID).
SEL (NSEL - N-selector) → Always 0 in a NET, as IS-IS operates at Layer 3.
Since System ID uniquely identifies a host/router within an area , the correct answer is A .
???? Reference: Huawei HCIA-Datacom Study Guide, IS-IS Addressing and NET Structure.
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