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Practice 1: Use the IP Security Monitor snap-in to view details about the active IPSec policy that is applied to your domain, or to a local host running Windows Server 2003 or Microsoft Windows XP Professional. View Quick Mode and Main Mode statistics, and active IPSec Security Associations (SAs). Practice 2: Search TechNet and the Microsoft Web site for Kerberos Tools. Do not download any third-party support tools.

Practice 1: Use the Internet Protocol (IP) Security Monitor snap-in to search for specific Main Mode or Quick Mode filters. Search for all matches for filters of a specific traffic type. Practice 2: If you have on your network a server or client running Microsoft Windows 2000, use Ipsecmon on that computer to monitor IPSec statistics. (You can also use Remote Desktop Connection from a server running Win dows Server 2003 to connect to a Windows 2000 Server system and remotely monitor IPSec using Ipsecmon, but that is not in the current examination specification.) Practice 3: Install Network Monitor on a server running Windows Server 2003. Capture and display encrypted traffic between two hosts on your network. Perform this task by capturing all traffic and setting up a display filter.

Check pointers before using them Before you use a pointer in a critical part of your program, make sure the memory location it points to is reasonable. For example, if you expect memory locations to be between StartData and EndData, you should view a pointer that points before StartData or after EndData suspiciously. You ll have to determine what the values of StartData and EndData are in your environment. You can set this up to work automatically if you use pointers through access routines rather than manipulating them directly. Check the variable referenced by the pointer before using it Sometimes you can perform reasonableness checks on the value the pointer points to. For example, if you are supposed to be pointing to an integer value between 0 and 1000, you should be suspicious of values over 1000. If you are pointing to a C++-style string, you might be suspicious of strings with lengths greater than 100. This can also be done automatically if you work with pointers through access routines. Use dog-tag fields to check for corrupted memory A tag field or dog tag is a field you add to a structure solely for the purpose of error checking. When you allocate a variable, put a value that should remain unchanged into its tag field. When you use the structure especially when you delete the memory check the tag field s value. If the tag field doesn t have the expected value, the data has been corrupted.

15-4

The critical component of the site-to-site VPN server connection is the VPN server that acts as a router between the Internet-connected traffic and the intranet traffic of the organization (the VPN router). In this section, we will:

When you delete the pointer, corrupt the field so that if you accidentally try to free the same pointer again, you ll detect the corruption. For example, let s say that you need to allocate 100 bytes: 1. new 104 bytes, 4 bytes more than requested.

Implementing, Managing, and Maintaining Network Security (3.0)

This section lists supplemental readings by objective. You should study these sources thoroughly before taking exam 70-291. Objective 3.1 Review Lessons 1 and 2 of 11, Managing Network Security.

2. Set the first 4 bytes to a dog-tag value, and then return a pointer to the memory that starts after that.

Microsoft Corporation. Windows Server 2003 online help. Redmond, Washington. Review Secedit, Analyze and Configure Security, For Administrative Tasks, Use the Principle of Least Privilege, and Security Configuration Manager Tools. Microsoft Corporation. Microsoft Windows Server 2003 Deployment Guide. Redmond, Washington. Review Baseline Security Analysis, available on the Microsoft Web site at http://www.microsoft.com/technet/treeview/default.asp url=/technet/security/tools/tools /mbsawp.asp 2.2. Objective 3.2 Review all of 12, Maintaining a Network Infrastructure.