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Microsoft recommends using the WEP and IEEE 802.1X combination as a suitable security configuration for wireless clients running the Windows operating system.

message box can inform the user exactly what was done to perform the task. A primary advantage of using a message box is that it lets you present a message to the user that can t be ignored. It s even possible to force the user to react to the message box by not allowing them to switch to or open any other application. As useful as message boxes are, they do have several limitations, such as the following:

Be sure you are familiar with the security hazards inherent in wireless networking, and with the mechanisms that Windows operating systems can use to authenticate wireless clients and encrypt their traffic.

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The following questions are intended to reinforce key information presented in this lesson. If you are unable to answer a question, review the lesson materials and try the question again. You can find answers to the questions in the Questions and Answers section at the end of this chapter. 1. Which of the following authentication mechanisms enables clients to connect to a wireless network using smart cards a. Open System authentication b. Shared Key authentication c. IEEE 802.1X authentication using EAP-TLS d. IEEE 802.1X authentication using PEAP-MS-CHAP v2

Note Regarding repeated code, you might be surprised to see that I mentioned the OAOO principle instead of the most popular Don t Repeat Yourself (DRY). Both come from the world of Extreme Programming (XP) and are two of the 12 common XP practices. What s the difference between the two DRY refers to storing data in one place and with one unambiguous representation. OAOO refers to implementing a given behavior once and only once. It turns out that OAOO is more difficult to achieve and often only a driving vector. OAOO is the ideal goal of any refactoring attempt, and it s similar to normalization, as you might know it from the theory of relational databases.

A message box can present only one, two, or three buttons for users to choose from,

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present more information/options to a user. Despite these limitations, the message box is a very handy tool for any programmer. The syn tax of a message box statement is shown here.

2. You are installing an IEEE 802.11b wireless network in a private home using com puters running Windows XP, and you decide that data encryption is not necessary, but you want to use Shared Key authentication. However, when you try to config ure the network interface adapter on the clients to use Shared Key authentication, the option is not available. Which of the following explanations could be the cause of the problem a. WEP is not enabled. b. Windows XP SP1 is not installed on the computers. c. Windows XP does not support Shared Key authentication. d. A PKI is required for Shared Key authentications. 3. Which of the following terms describe a wireless network that consists of two laptop computers with wireless network interface adapters communicating directly with each other (Choose all that apply.) a. Basic service set b. Infrastructure network c. Ad hoc network d. Access point

The purpose of the pattern is self-explanatory. It essentially teaches you a way to reuse the same code to serve both GET and POST requests for the same resource or, as in ASP.NET MVC, for the same action. You start by fully writing your code for the GET scenario, as shown here:

Most wireless LANs today are based on the 802.11 standards published by the IEEE. WLANs have two primary security hazards: unauthorized access to the network and eavesdropping on transmitted packets. To secure a wireless network, you must authenticate the clients before they are granted network access and encrypt all packets transmitted over the wireless link. To authenticate IEEE 802.11 wireless network clients, you can use Open System authentication, Shared Key authentication, or IEEE 802.1X. To encrypt transmitted packets, the IEEE 802.11 standard defines the Wired Equiv alent Privacy (WEP) mechanism.

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