On an IS-IS network, the length and components of aNETare the same as those of anNSAP. Which of the followingNETfields is used to uniquely identify a host or router in an area?
NET (Network Entity Title)is a special form ofNSAP (Network Service Access Point)used inIS-IS routing.
NET consists of three fields:
AFI (Authority and Format Identifier) + IDI (Initial Domain Identifier) + Area Address→ Identifies thearea.
System ID→ Uniquely identifies arouter within an area(similar to an OSPF Router ID).
SEL (NSEL - N-selector)→ Always0in a NET, as IS-IS operates at Layer 3.
SinceSystem IDuniquely identifies ahost/router within an area, the correct answer isA.
????Reference:Huawei HCIA-Datacom Study Guide, IS-IS Addressing and NET Structure.
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