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Class 3: Two-way client and server authentication Security in the WLAN Data security is one of the biggest concerns facing network administrators when implementing a WLAN. In a wired environment, the lack of access to the physical wire can prevent someone from wandering into your building and connecting to your internal network. In a WLAN scenario, it is impossible for the AP to know if the person operating the wireless device is sitting inside your building, passing time in your lobby, or sitting in a parked car just outside your office. Acknowledging that passing data across an unreliable radio link could lead to possible snooping, the IEEE 802.11 standard provides three ways to ensure a greater amount of security for the data that travels over the WLAN. Adopting any (or all three) of these mechanisms decreases the likelihood of an accidental security exposure. The first method makes use of the 802.11 SSID. This SSID can be associated with one or more APs to create multiple WLAN segments within the infrastructure BSS. These segments can be related to floors of a building, business units, or other data-definition sets. Because the SSID is presented during the authentication process, it acts as a crude password. Because most end users set up their wireless devices, these SSIDs could be shared among users, thus limiting their effectiveness. Another disadvantage to using SSIDs as a sole form of authentication is that if an SSID were to be changed (due to an employee termination or other event, for example), all wireless devices and APs would have to reflect this change. On a medium-sized WLAN, rotating SSIDs on even a biannual basis could prove to be a daunting and time- consuming task.

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Figure 10-27.

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As mentioned earlier, the AP also can authenticate a wireless device against a list of MAC addresses. This list could reside locally on the AP, or the authentication could be checked against a database of allowed MACs located on the wired network. This typically provides a good level of security, and is best used with small WLAN networks. With larger WLAN networks, administering the list of allowable MAC addresses requires some back-end services to reduce the amount of time needed to make an addition or subtraction from the list. The third mechanism IEEE 802.11 offers to protect data traversing the WLAN was also mentioned earlier. The privacy service uses an RC4 based encryption scheme, or WEP, to encapsulate the payload of the 802.11 data frames. WEP specifies a 40-bit encryption key, although some vendors have implemented a 104-bit key. As mentioned previously, WEP is not meant to be an end-to-end encryption solution. WEP keys on the APs and wireless devices can be rotated, but because the 802.11 standard does not specify a key-management protocol, all key rotation must be done manually. Like the SSID, rotating the WEP key would affect all APs and wireless users and take significant effort from the network administrator. Understanding 802.1x IEEE 802.1x is a standard for port-based network access control that provides authenticated network access to 802.11 wireless networks and wired Ethernet networks. That is, these standards allow for additional authentication methods. Port-based network access control uses the physical characteristics of a switched LAN infrastructure to authenticate devices that are attached to a LAN port and to prevent access to that port when the authentication process fails.

4 Scroll through the list to find and select CRL Distribution Points. 5 Scroll through the list in the lower half of the dialog box to locate the URL for the

During a port-based network access control interaction, as shown in Figure 5-8, a LAN port adopts one of two roles: authenticator or supplicant. In the role of authenticator, a LAN port enforces authentication before it allows user access to the services that can be accessed through that port. In the role of supplicant, a LAN port requests access to the services that can be accessed through the authenticator's port. An authentication server, which can either be a separate entity or colocated with the authenticator, checks the supplicant's credentials on behalf of the authenticator. The authentication server then responds to the authenticator, indicating whether the supplicant is authorized to access the authenticator's services.

CRL. When you know the URL for the CRL, you can point your browser to the site to download and install the CRL. If a CA in your enterprise issued the certificate, you can obtain the CRL from the CA. To obtain and install the CRL, follow these steps:

Figure 5-8. Remote access authentication roles The authenticator's port-based network access control defines two logical access points to the LAN through one physical LAN port. The first logical access point, the uncontrolled port, allows data exchange between the authenticator and other computers on the LAN, regardless of the computer's authorization state. The second logical access point, the controlled port, allows data exchange between an authenticated LAN user and the authenticator.

3 Click Download Latest Certificate Revocation List and save the file to disk. 4 After downloading the file, locate and right-click the file, and then choose Install CRL

On the other hand, the static keyword is interpreted differently at local scope (inside of a function, for example). At local scope, a static variable has a value that persists from one invocation of the function to the next.

You need a faster way to validate certificates If you often work with digitally signed messages and frequently need to verify certificates, consider adding the Verify Digital Signature command to the toolbar to give you a one-click method of viewing the certificate properties. To add the command to the toolbar, follow these steps:

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