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Local Security Authority (LSA). The entity that receives the user name and password from Winlogon and determines whether the logon process is to be authenticated on the local computer or across the network. Security Accounts Manager (SAM). The protected subsystem that manages user and group account information. If the logon process is to be authenticated locally, the SAM database on the local computer is used to verify the user s credentials. If the logon process is to be authenticated on a Windows NT 4.0 domain controller, the SAM database on the domain controller is used.

The Transmission Control Protocol/Internet Protocol (TCP/ IP) suite is a critical component of modern networking. Since its introduction, TCP/IP has proven to be flexible and robust enough for virtually any networking use, which has made it the most popular networking protocol in the world. IP is used to address the overwhelming majority of private networks, and it is the only addressing method used on the Internet. To understand TCP/IP, it is important to start with the big picture. In this chapter, the TCP/IP protocol suite and the Open Systems Interconnection (OSI) reference model are examined. The OSI reference model closely intertwines with TCP/IP and its associated network features. Additionally, this chapter surveys other common networking protocols. Throughout this chapter, you ll learn how to implement the various protocols and features within Microsoft Windows XP.

The service used, together with the NTLM protocol, to query the SAM on a domain controller to validate the user s credentials.

Net Logon service. Active Directory. The directory service in Windows 2000 and later. If the logon process is to be authenticated on a domain controller, the KDC service queries Active Directory to verify the user s credentials. Kerberos Key Distribution Center (KDC) service. The service used, together with the Kerberos authentication protocol, to authenticate logon requests to Active Directory.

Figure 16-1

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Administrators require a greater range of permissions than other users to perform their tasks, such as accessing files, installing and running applications, or modifying systems. However, running Windows XP Professional all the time as an administrator or a member of an administrative group makes the network more vulnerable to viruses, Trojan horses, and other security risks. To reduce risk, it is recommended that you perform nonadministrative tasks by using accounts that have only Users or Power Users rights and use your Administrator account only when you perform administrative tasks. You can use administrative rights and privileges even while logged on as a member of the Users or Power Users group. The RunAs program and the RunAs Service let you log on by using one security context and then, within the initial logon session, authenticate and use a second account. Figure 16-2 illustrates the RunAs dialog box.

16:

Figure 16-2

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For security reasons, you might want to disable the RunAs feature on Windows XP desktops. For more information, see article 830568, How to disable the Run As feature on a Windows Server 2003 based or on a Windows XP based computer, in the Microsoft Knowledge Base at http://support.microsoft.com.

The RunAs Service logs on an account with expanded permissions. For example, when you log on as a member of the Users group, you can perform routine tasks such as running programs and visiting Internet sites without exposing your computer to unnecessary risk. As a member of the Power Users group, you can perform routine tasks and install programs, add printers, and use most Control Panel items. Then, when you use the RunAs program to log on as an administrator, you can start a program in the Administrators group security context. You can use the RunAs program to start any program, program shortcut, saved MMC console, or Control Panel item if the following conditions exist:

Connecting with Windows XP Connecting Windows XP and Novell NetWare Interconnecting Windows XP and UNIX/Linux Connecting Windows XP to Apple Macintosh Systems 519