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In Windows 2000, you can view the status of IPSec SAs and basic information on IPSec sessions by running IPSecmon from the Run prompt. IPSecmon displays information about each SA and the overall statistics of IPSec and IKE sessions. Figure 19-8 shows IPSecmon in Windows 2000. The built-in Server IPSec policy is applied to the computer running Windows 2000 named SFOFS001. The SFOFS001 computer has attempted to negotiate IPSec with three other computers: SEADC001, SFODC001, and SFOXP001. However, SFOFS001 has successfully negotiated an SA with SFOXP001 only. The IPSec session with SFPXP001 uses the IPSec protocol ESP with 3DES as the encrypting algorithm and HMAC SHA1 as the authentication algorithm.

Part III:

cable modem A device that connects a computer or local area network to a broadband network that shares the same cable used to deliver cable television. Cable modems are used primarily to deliver broadband Internet access. Some cable companies use a shared access method, where bandwidth is shared among users in certain areas or neighborhoods. In many new cable implementations, there is so much bandwidth available that performance is usually not a problem. Carrier Sense Multiple Access with Collision Detection (CSMA/CD) A contention-based network media access method. Using CSMA/CD, network hosts listen for traffic on the network and attempt to transmit data as soon as no traffic is heard. If multiple hosts transmit at once, a collision occurs, and all transmitting hosts retry their communications. See also token passing. Challenge Handshake Authentication Protocol (CHAP) An encrypted authentication mechanism that does not transmit the password in clear text across the initial connection. Instead, a handshake process allows the client to prove its identity. A revision of CHAP, MS-CHAP revises the authentication process to supply specific information needed to authenticate to Windows networks. client A computer that connects to another remote computer (often called a server) to request resources such as files or remote printers. See also server.

Figure 19-8

In Windows Server 2003 and Windows XP, IPSecmon has been replaced with an MMC snapin that provides all the information that IPSecmon did in Windows 2000, only in much greater detail. You can use the IP Security Monitor MMC snap-in to view details of each SA, whereas in Windows 2000, you could view only the basic details of an SA. Figure 19-9 shows the IP Security Monitor MMC snap-in in Windows XP, which enables you to view the exact SA details negotiated during both main mode and quick mode.

bandwidth The speed of transmission of a digital communications system as measured in bits per second.

Figure 19-9

7. Run the application, and determine whether the buttons are working. Everything should be working except for the navigation buttons. You ll now modify the behavior of the two navigation buttons in the tsbIcons tool strip to make sure they re enabled only when they should be that is, when there are pages in the browser s history. When you start the application, the buttons should be disabled. The best place to put this code is the Load event of the Browser form. It s a good place because the event will happen right before the user actually sees the form. Next, you need to think about where you should put the code that will enable and disable the two navigation buttons. The ideal place for the validation code is where the navigation occurs because you know at that moment the browser will navigate to a new URL.

Computers running Windows XP Professional that are not joined to a domain also use NTLM for authentication. If you use Windows XP Professional on a network that includes Active Directory, you can use Group Policy settings to manage logon security, such as restricting access to computers and logging users off after a specified time. For more information about logon security, see 16, Understanding Logon and Authentication.

Authorization controls user access to resources. Using access control lists (ACLs), security groups, and NTFS file permissions, you can make sure that users have access only to needed resources, such as files, drives, network shares, printers, and applications. Security groups Security groups, user rights, and permissions can be used to manage security for numerous resources while maintaining fine-grained control of files and folders and user rights. The four main security groups include: