7 DNS, SNMP NetBIOS OSPF IGRP RIP INT, IS-IS StAP MAany Physical Imp lem entation Figure3-1. Relationship of the Internet Protocol Suite to the OSI Reference Model 3.3.2IP IP is the primary layer 3 protocol in the Internet suite. In addition to internet work routing IP provides error reporting and fragmentation and reassembly of information units called datagrams for transmission over networks with different maximum data unit sizes. IP represents the heart of the Internet protocol suite IP addresses are globally unique, 32-bit numbers assigned by the Network Information Center Globally unique addresses permit IP networks any where in the world to communicate with each An IP address is divided into three parts. The first part designates the network address, the second part designates the subnet address, and the third part designates the host address IP addressing supports three different network classes. Class A networks are intended mainly for use with a few very large networks, because they provide only 8 bits for the network address field. Class B networks allocate 16 bits, and Class C networks allocate 24 bits for the network address field. Class C networks only provide 8 bits for the host field, however, so the number of hosts per network may be a limiting factor. In all three cases, the leftmost bit(s)indicate the network class. IP addresses are written in dotted decimal format; for example, 34.0.0.1. Figure 2 shows the address formats for Class A. B. and C IP networks Figure3-2 The address formats for Class A, B, and C IP networks IP networks also can be divided into smaller units called subnet works or "subnets. SubnetsFigure3-1. Relationship of the Internet Protocol Suite to the OSI Reference Model 3.3.2 IP IP is the primary layer 3 protocol in the Internet suite. In addition to internet work routing, IP provides error reporting and fragmentation and reassembly of information units called datagrams for transmission over networks with different maximum data unit sizes. IP represents the heart of the Internet protocol suite. IP addresses are globally unique, 32-bit numbers assigned by the Network Information Center. Globally unique addresses permit IP networks anywhere in the world to communicate with each other. An IP address is divided into three parts. The first part designates the network address, the second part designates the subnet address, and the third part designates the host address. IP addressing supports three different network classes. Class A networks are intended mainly for use with a few very large networks, because they provide only 8 bits for the network address field. Class B networks allocate 16 bits, and Class C networks allocate 24 bits for the network address field. Class C networks only provide 8 bits for the host field, however, so the number of hosts per network may be a limiting factor. In all three cases, the leftmost bit(s) indicate the network class. IP addresses are written in dotted decimal format; for example, 34.0.0.1. Figure 2 shows the address formats for Class A, B, and C IP networks. Figure3-2 The address formats for Class A, B, and C IP networks IP networks also can be divided into smaller units called subnet works or "subnets." Subnets