Designing the Network Infrastructure for Physical Security in Visual C#

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Designing the Network Infrastructure for Physical Security
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Your users understand the need for confidentiality, and most of them are required to work from the regular systems at all times. This restriction has advantages, as assigned computers can be more closely audited and secured. You have decided to design a policy to block access from computers that are not under the control of authorized users. The 192.168.5.0/24 subnet has been reserved for IT administrators, and no other computers are assigned addresses within that range. Answer the following question.
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1. What steps should you take to design the policy
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Exercise 3: Creating an IPSec Policy Using the Wizards
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In this exercise, you will implement the policy designed in Exercise 2. To do this, you create an MMC console, create the blocking rule, create a negotiation rule, and select authentication. Complete the following procedures.
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Important Although a security designer might not be the individual who will implement IPSec policies on the network, IPSec policies can be quite complex. To design them, you must know what it is possible to do and what it is not possible to do. Reading rules, considerations, and guidelines is a good way to begin, but to understand how a complex policy that incorpo rates multiple rules including permitting, blocking, and negotiating rules cannot be done by simply imagining how it might work in your head or by using logical diagrams. The designer must have experience in making a complex policy work. If you have met the prerequisites for this exam, you should have been exposed to the concept of a simple IPSec policy and you should have stepped through the construction of one. You might not, however, have designed and implemented a complex policy. Much can be learned by doing so. This exercise provides the step-by-step instructions for creating such a policy. If you want to implement it and test it, you will need two computers configured as described in the Getting Started section of this book and placed on the same test network.
In this exercise, the policy is created on one computer. When complete, it can be exported to a file and imported onto others. Remember that each file server and each authorized client will need a copy of the policy. Modification will have to be made to the policy to ensure that individualized information, such as certificates, is properly handled.
Create an MMC console Complete the following steps to create an MMC console: 1. Click Start, and then click MMC. 2. On the File menu, click Add/Remove Snap-in, and then click Add. 3. From Add Standalone Snap-ins, select IP Security Policy Management and then click Add. 4. In the Select Computer Or Domain dialog box, accept the default local computer selection and then click Finish. (See Figure 3-8.) Then click Close, and click OK. 5. From the File menu, click Save-As, enter the file name IP Policy Management, and click Save.
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Designing the Network Infrastructure for Physical Security
Figure 3-8
Selecting the IP security policy on the local computer
Create the blocking rule Complete the following steps to create a blocking rule: 1. In the IP Policy Management console just created, right-click the IP Security Poli cies on the Local Computer container and select Create An IP Security Policy from the context menu. 2. On the wizard welcome page, click Next. 3. Name the policy Block File Share Access, enter a description, and click Next. 4. Deselect the Default Response Rule check box, click Next, and then click Finish.
Note The default response rule allows insecure communication. In most cases, you will not want this, so it is good practice to remove the rule.
5. In the Blocking Web Server Access Properties dialog box, near the bottom of the Rules tab, clear the Use Add Wizard check box (shown in Figure 3-9), and click Add.
Tip When writing a blocking rule, further use of the wizard is counterproductive because it steps you through the creation of more complex policies and introduces confusion and extra work. By deselecting the wizard check box, the policy property pages are displayed after click ing Add.
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