642-891 Composite Exam
Note 1: 642-891 Exhibit and all related diagrams are not shown in demo questions.
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Note 2: 642-891 Answers are not shown in demo questions.
Exhibits and Answers are only provided in the Full Version.
Demo Question 2.
You are a guest lecturer at the EliteCertify Academy and are preparing a lesson on the Cisco IS-IS. Which of the following points can you include in your discussion of the Cisco IS-IS NSAP address System IDs? (Select three)
A. System IDs can vary in size within a domain.
B. The System ID identifies a node in an IS-IS network.
C. The System ID must be unique within a Level-1 area.
D. The System ID must be unique within a Level-2 area.
E. The System ID must be the MAC address of the router.
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Answer: B, C, D
Explanation: B. Each system ID within an area must be unique. It is used to identify a IS-IS node.
C. All Level 1 routers and hosts in an area must have an NSAP with the same area
address.
D. Level 2 routers advertise their own area addresses (NSAP) to the other Level 2 routers
in the backbone.
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