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ccna 200 301 bookshelves for kids.In a Class A network address, the first byte is the network address and the next 3 bytes are the node address. Thus the format of a Class A address is as follows.Network. node,node. NodeFor example, in the IP address 49.22.102.70, 49 is the network address, and 22.102.70 is the node address. All devices in this network use the same network address: 49o5.1 IPv4 Addressing 139To do this, ISPs and enterprises-that is, end users, it doesn't really matter what their organization is-need to use a mechanism called network address translation (NAT) so that the private IP addresses used by their internal networks can be into an address that can be routed across the Internet. For the end user, there can be many people using the same IP address and connecting to Intemeto this way saves us a lot of address space - good for everyone!Now further on to the special numbering: network addresses with all zeros are reserved for default routing (see Table 5.1 for details); . Network address 127 is reserved for device self-testing and therefore cannot be used either; in this way, the only truly usable Class A address is 1.126. which means that there are a total of 128-2(126) Class A network addresses actually available.The IP address 127.0.0.1 is used to detect each node's own IP stack and is not used as a legitimate host address. However, this loopback address is also used for communication between different TCP/IP applications and services in the same device.Each Class A address has 3 bytes (24 bits) of node address space. This means that there are a total of 224 (16777216) different combinations, which means that there can be so many node addresses in each Class A network. Since all-0 and all-1 node addresses are reserved, the actual maximum number of node addresses available in a Class A network is 22 seven 2 (16 777 214). Either way, that's a huge set of hosts for a network segment!Valid host IDs for a Class A network Take a look at the following examples to see how to calculate the valid IDs in a Class A network addressHost bits all. Indicates a network address: lO.O.O.Oo Host bit all 1 indicates a broadcast address: 10.255.255.255o Valid host addresses are those that are numbered between the network address and the broadcast address: 10.0.0.1.