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Typically, your throughput on any given wireless network is half of the overall bandwidth For example, an 80211b network usually runs with only 55 Mbps throughputThe overhead bandwidth involved really makes a difference

One of the biggest problems of wireless networks is security War driving is a term used in the old days of hacking when a person would continually dial phone numbers until he eventually dialed a number of a computer system and then would try to hack into it using various methods Today, the term is commonly used to describe hackers that roam around with a laptop and 80211b/g NIC trying to find WLANs to break into Most WLAN solutions support some form of security features; however, it is really surprising about the number of SOHO companies and home users that don t implement these features, basically allowing someone who is driving by to get free Internet access or worse, opening up their network to other forms of attacks The following sections discuss some common threats WLANs face and security solutions you can implement to mitigate these threats

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Before learning about security solutions available for your WLAN networks, you should understand how an end user client with a WLAN NIC accesses a LAN or other wireless services via an access point (AP) To allow clients to find the AP easily, the AP periodically broadcasts beacons, announcing its Service Set Identifier (SSID), data rates, and other WLAN information SSID is a naming scheme for WLANs to allow an administrator to group WLAN devices together To discover APs, clients will scan all channels and listen for the beacons from the AP(s) By default, the client will associate itself with the AP that has the strongest signal When the client associates itself with the AP, it sends the SSID, its MAC address, and any other security information that the AP might require based on the authentication method configured on the two devices Once connected, the client periodically monitors the signal strength of the AP to which it is connected;

if the signal strength becomes too low, the client will repeat the scanning process to discover an AP with a stronger signal This process is commonly called roaming 80211 defines only two authentication methods for APs to authentication clients:

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Exchanging four hello packets that contain no verification (basically no security at all) A static encryption key is used with the Wireless Equivalency Privacy (WEP, or sometimes referred to as the Wireless Encryption Protocol), which is very weak by today s standards

A good WLAN security solution should provide for the following:

Protect data transmitted between the edge WLAN device and the access point, providing privacy and confidentiality Control who is allowed to access LANs behind the WLAN access points

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Intrusion prevention system (IPS)

A brief overview of some of these solutions is found in Table 5-2 The following sections discuss methods available for securing your wireless network

4 5 6

TABLE 5-2

Introduced Encryption User Authentication 1997 Static keys, breakable None (optional MAC address filtering)

2001 Dynamic keys Usernames/ passwords, certificates, pre-shared keys (PSK)

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