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ccna 200 301 bookshelves ideas basement.A network address (NetworkAddress, also known as a network number) uniquely identifies a network. All devices on the same network have the network address as part of their IP address. For example, for IP address 172.16.30.56, 172.16 is its network address.The Node Address is the address assigned to a device and uniquely identifies each device in the network. This part of the address must be unique because it identifies each specific device one-by-one as opposed to a network address, which identifies a group of devices. This part of the address is also called the YI i&tk (Host Address). o For example, in the IP address 172.16.30.56, 30.56 is the node address.The designers of interconnection networks decided to classify the networks according to their size. Class A networks are networks that contain a very large number of nodes, but the number of these networks is small. In contrast to this are Class C networks,which are very large in number but contain relatively few nodes in each network. Between such very large and very small networks, there is a class B network.How the network address and node address of an IP address are divided depends on the network class to which the address belongs. Figure 5.1 summarizes these three classes of networks, and this section is continued in depth in subsequent sections of this chapter.8 bits 8 bits 8 bits 8 bitsClass D: MulticastClass E: Study Figure 5.1 summarizes the three classes of networksTo ensure efficient routing, the designers of interconnection networks define the few bits that head each class of address as different values. For example, because the router knows that a Class A address always starts with a 0, the router can forward the first bit of this address as soon as it is read. This is where this address plannerNetwork Address Range: Class AThe designers of the IP address mechanism decided that the first bit of the first byte of a Class A network address must always be set to 0, meaning that the first byte of a Class A address must be between 0.127 (inclusive). Look at the following network address.