79Chapter four: Security of wireless ad hoc network
4.1.4 Comparing wireless network and wired network
The key advantage of wireless networks over wired network emerges
from the major difference between the two; that is, one uses network
cables and the other uses radio frequencies (see Figure 4.9).
• Though wireless networking is a lot more mobile than wired net-
working, the range of the network is usually 150–300 indoors and up
to 1000 ft outdoors depending on the terrain, but wired network is
much more secure than wireless network, and transmission speeds
can suffer from outside interference.
• Wired networks are inexpensive compared with wireless network
installation, for wireless adapters and access points may cost three
or four times as much as Ethernet cable adapters and hubs/switches.
Broadband routers cost more, but these are optional components of a
wired network, and their higher cost is offset by the benet of easier
installation and built-in security features.
• Wired LANs offer superior performance compared with wire-
less networks as it degrades because of distance sensitivity; that is,
maximum performance will degrade on computers farther away from
the access point or other. A traditional wired Ethernet connection
offers only 10Mbps bandwidth, but 100Mbps Fast Ethernet technol-
ogy costs a little more and is readily available. Fast Ethernet should
be sufcient for le sharing, gaming, and high-speed Internet access.
But greater mobility of wireless LANs helps offset the performance
• Wireless LANs are less secure than wired LANs because wireless
communication signals travel through the air and can easily be
intercepted. But wireless networks can be made as secure as wired
networks are for the ease of mobility; that is, wireless networks
protect their data through the wired equivalent privacy (WEP)
Radio wave and microwave
Figure 4.9 Radio frequency distribution.