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CCIE Routing and Switching v4.0 Quick Reference, Second Edition by Steven Means, Jacob Uecker, Brad Ellis

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Chapter 3. IP Addressing

IPv4 Addresses

IPv4 addresses consist of 32 bits, which are divided into four sections of 8 bits, each called an octet. Addresses are typically represented in dotted-decimal notation. For example

10.200.34.201

Subnet masks identify which portion of the address identifies a particular network and which portion identifies a host on the network.

The address classes defined for IP networks consist of the following subnet masks:

Class A 255.0.0.0 (8 bits)

Class B 255.255.0.0 (16 bits)

Class C 255.255.255.0 (24 bits)

Class A addresses begin with 0 and have a first octet in decimal of 1 to 127. Class B addresses begin with 10 and range from 128 to 191. Class C addresses begin with 110 and range from 192 to 223.

Class D and ...

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