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1. In general, the only validation that can be performed on free-form name input is whether or not they are required. If so, then this validation would be performed in the Validating event on the form. 2. The phone number of the contact should be initially validated using a MaskedTextBox with an appropriate pattern assigned to the Mask property. As a secondary validation, you could ensure that the area code is correct and that the exchange exists within the area code. This second validation would take place as part of the business rule validation. 3. The e-mail address of the contact should be validated (to start with) using a regular expression in the Validating event handler. Although it might seem that the Mask property could be used, the reality is that the patterns don t work well for arbitrarily long input. Once the format of the address has been validated, a second level of validation could take place, including verifying that the domain name exists.
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Supporting File Encryption . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10
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8. The wizard offers to help you install other hardware, as shown in Figure 6-5. You can choose one of two options:
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Lab: Create Localized Forms
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An example of a DDL trigger is as follows:
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E. Incorrect: FileE.htm will be restored when Laherty restores the Wednesday dif
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Step 3: Evaluate the Situation
Figure 7-8
Russell Hunter, Security Engineer Thanks for your analysis of the application behavior. What we have here is a classic man-in-the-middle attack. Usually we see these when an attacker manipulates DNS to trick clients into sending requests to the attacker s server instead of the legitimate server, but this one is happening between components of your application. They re caused by the same vulnerability. Just like any Web server that doesn t use an SSL certificate, the thirdparty component you are using doesn t have any way to prove its identity. So, your application trusts any file that happens to be named Proseware.dll. Therefore, anybody who has permission to rename a file can create a man-in-the-middle exploit. Question is, how do we validate the third-party component using something other than a filename Tell ya what. You figure out how to prevent this in the future, and I ll track down who did it. It s probably that developer that quit a few weeks ago, what s his name Max Benson. Margie Shoop, President, Margie s Travel We ll probably be going out of business soon, but on the off chance that we don t lose all our customers, we should find a way to prevent this in the future. Whose fault is it, anyway: ours or Proseware s I set up a meeting with Proseware s president and development manager. Don t pull any punches. Kim Abercrombie, President, Proseware, Inc. I m really sorry to hear about your recent compromise. I understand it was caused by an attacker renaming our file, and then impersonating it with his own. We do our best to create secure components, but I don t know what we can do to fix problems you have with desktop access restrictions. You shouldn t let users modify application files. Anyway, as a sign of good faith, I m prepared to offer you our preferred customer discount of 15 percent off additional client licenses and upgrades. Jay Henningsen, Development Manager, Proseware, Inc. Look, we re both developers, but I m no security guy. I don t really know how this could have been prevented, but then again, I don t really know what a man-in-the-middle attack is. You tell me how I can make this better, and I ll do it.
To locate the IP address and subnet mask currently assigned to your computer
Before taking the exam, review the key topics and terms that are presented in this chapter. You need to know this information.
Lesson 2 Review
xxix
Lesson 1
After this lesson, you will be able to:
You are attempting to use the Computer Management snap-in to remotely manage a file server on your network. The file server is a member of the domain, and you are a member of the Domain Admins group. You cannot connect the Computer Management snap-in to the file server from your computer but are able to connect remotely to other servers on your network. You can access files on the file server, as can all other users on the network. What could be the problem with the file server A. The Browser service is not running. B. The Remote Registry service is not running. C. Routing and Remote Access is not installed on the file server. D. The computer account needs to be reset in Active Directory.
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Lesson 4: Configuring Monitoring
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