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A physical disk that can be accessed only by Windows 2000 and Windows XP. Dynamic disks provide features that basic disks do not, such as support for volumes that span multiple disks. Dynamic disks use a hidden database to track information about dynamic volumes on the disk and other dynamic disks in the computer. You convert basic disks to dynamic by using the Disk Management snap-in or the DiskPart command-line tool. When you convert a basic disk to dynamic, all existing basic volumes become dynamic volumes. See also active volume; basic disk; basic volume; dynamic volume; partition; volume.

See definition for Extensible Authentication Protocol (EAP).

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On Itanium-based computers, a portion on a GUID partition table (GPT) disk that is formatted with the FAT file system and contains the files necessary to start the computer. Every Itanium-based computer must have at least one GPT disk with an EFI system partition. The EFI system partition serves the same purpose as the system volume found on x86-based computers. See also Extensible Firmware Interface (EFI); GUID partition table (GPT); Microsoft Reserved (MSR) partition. An IPSec protocol that provides confidentiality, in addition to authentication, integrity, and anti-replay. ESP can be used alone, in combination with Authentication Header (AH), or nested with the Layer Two Tunneling Protocol (L2TP). ESP does not normally sign the entire packet unless it is being tunneled. Ordinarily, just the data payload is protected, not the IP header. See also authentication; Authentication Header (AH); integrity; Internet Protocol security (IPSec); Layer Two Tunneling Protocol (L2TP). A feature in this version of Windows that enables users to encrypt files and folders on an NTFS volume disk to keep them safe from access by intruders. See also NTFS file system. sage or data in such a way as to hide its substance. See also public key encryption.

Encapsulating Security Payload (ESP)

current session. You can manage passwords such as saved dial-up or virtual private network (VPN) passwords or your .NET Passport. You can also open the Local Users And Groups console (which is also available in Computer Management) where local users and groups can be managed. In addition, you can require that users press Ctrl+Alt+Delete before logging on.

dynamic leased configuration of host IP addresses and distributes other configuration parameters to eligible network clients. DHCP provides safe, reliable, and simple TCP/IP network configuration; prevents address conflicts; and helps conserve the use of client IP addresses on the network. DHCP uses a client/server model where the DHCP server maintains centralized management of IP addresses that are used on the network. DHCP-supporting clients can then request and obtain a lease of an IP address from a DHCP server as part of their network boot process. See also IP address; Transmission Control Protocol/Internet Protocol (TCP/IP).

Encrypting File System (EFS)

encryption The process of disguising a mes-

Why Use Ctrl+Alt+Delete to Log On Pressing Ctrl+Alt+Delete during logon is a security measure that can help protect your computer and network security. Universally, programs running on Windows cannot intercept the Ctrl+Alt+Delete keystroke, except Winlogon.exe, the Windows service that enables logging on and logging off. Virus programs known as Trojan horses can present a fake logon dialog box when you start up your computer. If you were to type your user name and password into such a rogue dialog box the Trojan horse could steal your name and password. However, requiring Ctrl+Alt+Delete to be pressed when logging on ensures that the next dialog box you see is the authentic Log On To Windows dialog box. When you set Windows XP to require you to press Ctrl+Alt+Delete to log on, you can rest assured that the logon dialog box presented to you is authentic.

dynamic disk. Windows supports five types of dynamic volumes: simple, spanned, striped, mirrored, and RAID-5. A dynamic volume is formatted by using a file system, such as FAT or NTFS, and has a drive letter assigned to it. See also basic disk; basic volume; dynamic disk; mirrored volume; RAID5 volume; simple volume; spanned volume; striped volume; volume.

dynamic-link library (DLL) An operating sys-