CCIE Routing and Switching Exam Quick Reference Sheets

Chapter 10. IPv6

Address Structure

An IPv6 address is 128 bits long, a much larger address space than the address space in IPv4. It can provide approximately 3.4 * 10 ^ 38 addresses.

IPv6 addresses are represented as a series of 16-bit fields presented as a hexadecimal number and separated by colons (:). The format used is x:x:x:x:x:x:x:x.

To shorten the writing of IPv6 addresses, you can use the following techniques:

• The leading 0s in a field are optional.
• You can use two colons (::) to compress successive hexadecimal fields of 0s at the beginning, middle, or end of an IPv6 address; this can be done one time in an address (see Figure 10-1).

FIGURE 10-1 IP addresses

Benefits

The main benefits of IPv6 include the following:

• Has a larger IP ...