Protocol: collection of network data rules
Includes transmission rules
Internet Protocol version 4 (IPv4)
Used for past 20 years
IP address
32-bit number identifying computers
Base 2 (binary) number system
Computers use for internal calculations
Digit: 0 or a 1 (on or off condition)
Four billion different addresses (232 = 4,294,967,296)
Router breaks message into packets
Contains source and destination IP address