IPv6 Unique Local vs Site Local

Some of my older documentation (2007 and earlier) refers to site-local addresses.  The newer documentation has replaced site-local addresses with unique local addresses.  Here’s a breakdown on how the prefixes look:

Unique-local

FC00::/7
FD00::

Site-local

FEC0::/10
FED0::
FEE0::
FEF0::

It’s probably a good idea to be familiar with both.

While we’re on the subject of IPv6, the older documentation also mentions the universal/local (u/l) bit in MAC addresses, but states “this feature is not yet used.”***

Well, this bit is certainly used now so don’t forget to change the 7th bit when modifying EUI-64 addresses.

I’m not sure if the BSCI exam will contain the updated information or retain the old, but it can’t hurt to be know the changes.

Two days until the exam, I’m anxious to get it over with.  :)

***Authorized Self-Study Guide: BSCI (Third Edition)
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