Cisco CCIE Certification and CCNP Certification FAQs :
Given an ISIS network, must I convert it into hex?
Date: 2005-06-28 17:45 -500
As Chris rightly mentioned, the first byte is the AFI. The AFI is specified in BCD (binary coded decimal) format so you cannot have an AFI value of FF. The highest AFI value that you can have is 99 (which would be coded in binary as 10011001).
Date: 2005-06-28 11:08 -500
As long as the system ID is 6 bytes, both ff.systemid.00 and
00.00ff.systemid.00 are valid, it just depends how long the overall
address has to be, depending on question requirements. The area ID has
to be between 1 and 13 bytes in length. However, be careful, the first
byte in the area ID can have special meaning, and is known as the AFI,
specifying a top-level ISO addressing authority. In a private network,
this should not matter though and the common practice is to set the AFI
to the value 49, which is private addressing for NSAPs.
Date: 2005-06-27 18:06 -500
The NET can be 8-20 bytes, with the last byte set to zero. The 6 bytes
directly in front of this last byte are the system ID. All bytes in
front of the system ID are the area ID. So if you are given 255 in
decimal as the area ID, look at it like this:
00.00FF.xxxx.xxxx.xxxx.00
Area ID.System ID .N-selector and must be 0
Date: 2005-07-14 09:13 -500
I have asked the proctor during the exam and he stated that he could not
answer that question.
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