11i-compliant. This means you??™ll
have to downgrade your encryption to one of the weaker standards
explained in the ???Choosing the Right Encryption Scheme: WEP, WPA,
or WPA2???? sidebar, earlier in this chapter, and try again.
Beyond SSIDs and encryption, a wireless connection is not much different
than a wired connection. See ???Troubleshoot Network Connections,??? later in
this chapter, for help fine-tuning TCP/IP addresses, a particularly useful tool
when you have a mix of different computers and devices on your network.
Lock Out Unauthorized PCs
You??™ve got encryption. You??™ve got a hidden SSID. You??™ve set up a password
on all your shared folders (see Chapter 8). You??™re probably thinking that
your biggest problem is that nobody seems capable of remembering any of
their passwords, but it may be quite the opposite.
All of these security schemes rely on preshared information: anyone with your
WPA2 passphrase, your SSID, and your Windows password can connect to
your wireless network and possibly even read the files on your hard disk.
368 | Chapter 7: Networking and Internet
The system is built upon secrecy, and all it takes is a breach of that secrecy
for the whole system to break down.
For example, say you??™ve got a small business with 20 employees, and someone
gets fired. Or, perhaps you live in an apartment building with shared
wireless, and someone moves out. Either way, the person who has left the
system may still have the wireless passphrase (and, in the case of the small
business, a common Windows password), and may still be able to get into
your network.
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