December 2019
Beginner
510 pages
12h 7m
English
Content preview from Networking Fundamentals
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The format of an IPv6 address
We have already ascertained that IPv6 addresses are 128 bits long and are made up of hexadecimal numbers. In this section, we will look at the format of the address.
An IPv6 address is formed out of 8 groups of 4 hexadecimal numbers, with each group separated by a colon, that is, a : character. Each character in the address is worth 4 bits, so each group of hexadecimal numbers is worth 16 bits or 2 bytes. To round off the math here, 8 groups of 16 bits equals 128 bits.
Note that, unofficially, these groups are referred to as hextets because they are 16 bits, but this is unlikely to be mentioned in the exam. Also, I have heard people refer to the groups as octets as a throwback to IPv4, but this is 1) not a correct ...
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