Cisco Networks: Engineers' Handbook of Routing, Switching, and Security with IOS, NX-OS, and ASA

© Chris Carthern and William Wilson and Noel Rivera 2021

C. Carthern et al.Cisco Networkshttps://doi.org/10.1007/978-1-4842-6672-4_4

4. The Network Layer with IP

Chris Carthern¹  , William Wilson² and Noel Rivera³

(1)

Bangkok, Krung Thep, Thailand

(2)

FPO, AP, USA

(3)

APO, AE, USA

 

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 octets , in Internet Protocol version 4 (IPv4). IPv4 addresses are logical 32-bit addresses, whereas ...