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Cisco Networks: Engineers’ Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA by Noel Rivera, Richard Bedwell, William Wilson, Chris Carthern

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CHAPTER 4

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The Network Layer with IP

The heart of TCP/IP is Internet Protocol (IP) addressing and routing. An IP address is a numeric identifier assigned to each device on an IP network. The IP address provides the location of the device on the network. IP addresses are logical addresses implemented in software, unlike MAC addresses. IP addresses are represented as binary numbers in four sets of 8 bits each, called an octet, in Internet Protocol Version 4 (IPv4). IPv4 addresses are logical 32-bit addresses, whereas IPv6 addresses are logical 128-bit addresses. The binary numbers are represented as a decimal value, as seen in Table 4-1.

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