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Chapter (4) Network Design

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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