Cisco Certified Network Professional (CCNP) Question:
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Describe the structure and format of an NSAP address.

Answer:

An NSAP address has a length of 8 to 20 bytes and consists of three components:

► One to 13 byte area ID

► Six byte system ID

► One byte NSAP selector that is always equal to zero for a router

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If a router learns about the same network prefix through RIP, IGRP, EIGRP, and OSPF, which route will be preferred?Assume a router has a loopback address of 135.77.9.254. Convert the loopback address to an IS-IS system ID.