7.1 The IPv4 header7.1.1 The Version field7.1.2 The IHL field7.1.3 The DSCP and ECN fields7.1.4 The Total Length field7.1.5 The Identification, Flags, and Fragment Offset fields7.1.6 The TTL field7.1.7 The Protocol field7.1.8 The Header Checksum field7.1.9 The Source Address and Destination Address fields7.1.10 The Options field7.2 The binary number system7.2.1 Decimal7.2.2 Binary7.3 IPv4 addressing7.3.1 The structure of an IPv4 address7.3.2 Configuring IPv4 addresses on a router7.3.3 Attributes of an IPv4 network7.3.4 IPv4 address classesSummary