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Which of these IPv6 addresses are valid? Pick two.

A) fe80::5d18:6:a

B) 11:11::11

C) fe80::5d18::50

D) a0d8:11f1:8a88:0101:541c:2b3d:5572:03cg

E) 1101 IPv6 Circle

The answers: A) fe80::5d18:6:a and B) 11:11::11

An IPv6 address is displayed in hexadecimal, so it can only consists of the number 0-9 and the letters a-f. Groups of zeros can be abbreviated with a double colon, but only one double colon is allowed in a single address. Leading zeros in an address are optional.

Want to know more? Watch “IPv4 and IPv6.”

Although IPv4 has been the most popular protocol in the world, IPv6 has now become a standard installation in Windows 7. In this video, you’ll learn how to identify IPv4 addresses and IPv6 addresses, and how IPv6 addresses can be abbreviated to save space and make them more readable.