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How many bytes comprise the system ID within an IS-IS NET?
Correct Answer: B
Explanation/Reference: Explanation: Routers are identified with NETs of 8 to 20 bytes. ISO/IEC 10589 distinguishes only three fields in the NSAP address format: a variable-length area address beginning with a single octet, a system ID, and a 1- byte n-selector. Cisco implements a fixed length of 6 bytes for the system ID, which is like the OSPF router ID. Reference. http://www.cisco.com/en/US/products/ps6599/products_white_paper09186a00800a3e6f.shtml