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- Saad Ahmed
May 6, 2005, 12:55 am
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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.
My answer: A, B, C
My freinds saying: B, C, D
Re: System ID
B, C, D
All ISs and ESs in a routing domain must have system IDs of the same length.
Cisco implements a fixed length of 6 bytes for the system ID.
Each system ID within an area must be unique. It is used to identify a IS-IS
There are several techniques for creating unique system IDs
* Start numbering 1, 2, 3, 4, and so on.
* Use Media Access Control (MAC) addresses.
* Convert and use the loopback IP address: 192.168.11.1 -->
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