CCIE Security Exam: Aggregate Global IPv6 Addresses - Bit Pattern in First 16-Bit Group

Aggregate Global IPv6 Addresses

Prev Question Next Question

Question

Aggregate global IPv6 addresses begin with which bit pattern in the first 16-bit group?

Answers

Explanations

Click on the arrows to vote for the correct answer

A. B. C. D.

B.

The first 16 bits of an IPv6 address are known as the "prefix" and they are used to identify the network portion of the address.

In IPv6, global unicast addresses are assigned to public networks and are globally unique. They are assigned using a specific bit pattern in the first 16-bit group.

The bit pattern for global unicast addresses in IPv6 is 001, which means that the correct answer to the question is B.

To understand why, it's helpful to look at how IPv6 addresses are structured. An IPv6 address is 128 bits long, which is four times the length of an IPv4 address. The 128 bits are divided into eight 16-bit groups, separated by colons.

The first three bits of the first 16-bit group are used to identify the type of address. For example, 001 is used for global unicast addresses, while 111 is used for multicast addresses.

Therefore, the answer is B. Aggregate global IPv6 addresses begin with the bit pattern 001/3 in the first 16-bit group.