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Computer Network 2021

4.2.4 Reserved IP Addresses
Certain addresses are reserved and cannot be assigned to devices on a network. These
reserved host addresses include the following:

• Network addresses are used to identify the network itself, see Figure 4-17. The upper
box represents the 198.150.11.0 network. Data that is sent to any host on that network
(198.150.11.1 to 198.150.11.254) is seen outside the LAN as 198.159.11.0. The only time
the host numbers matter is when the data is on the LAN. The LAN in the lower box is
treated the same as the upper LAN, except that its network number is 198.150.12.0.

Figure 4-17 shown a Network Address Scheme

• The broadcast address is used to broadcast packets to all the devices on a network see
Figure 4-18. The upper box represents the 198.150.11.255 broadcast address. Data that
is sent to the broadcast address is read by any host on that network (198.150.11.1 to
198.150.11.254). The LAN in the lower box is treated the same as the upper LAN, except
that its broadcast address is 198.150.12.255.

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