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This chapter is from the book

This chapter is from the book

Security Systems

The ability for people to quickly report wrongdoings and suspicious activities is vitally important for providing security in all companies and organizations. A person equipped with a wireless phone, for example, can get critical information to the appropriate organization for it to respond to an emergency situation. For example, a security person in an airport can report the findings on an unattended piece of luggage, which would trigger a reaction from the airport security team. VoWLAN systems can certainly support these types of functions to bolster security through faster response to situations.

Companies can also deploy wireless security cameras that send video over wireless LANs. This approach is much more feasible than running wires to each camera. The ease of installation allows a greater number of cameras to be put in place, which increases the viewing of the different parts of a facility or campus.

A major issue with using wireless LANs for supporting wireless voice and video is that they are vulnerable to denial of service (DoS) attacks. A person wanting to disrupt the security system can block the flow of voice and video signals by jamming the network. For example, someone can transmit either an overriding RF signal or specialized protocols (such as multiple CTS frames having long NAV values) that block phones and cameras from accessing the network. Also, wireless video cameras are vulnerable to sniffing. For example, someone could passively monitor the video stream using a tool such as driftnet. Companies must consider these threats and plan accordingly.

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