This document uses the following terms:
Active Directory: The Windows implementation of a general-purpose directory service, which uses LDAP as its primary access protocol. Active Directory stores information about a variety of objects in the network such as user accounts, computer accounts, groups, and all related credential information used by Kerberos [MS-KILE]. Active Directory is either deployed as Active Directory Domain Services (AD DS) or Active Directory Lightweight Directory Services (AD LDS), which are both described in [MS-ADOD]: Active Directory Protocols Overview.
Active Directory Domain Services (AD DS): A directory service (DS) implemented by a domain controller (DC). The DS provides a data store for objects that is distributed across multiple DCs. The DCs interoperate as peers to ensure that a local change to an object replicates correctly across DCs. AD DS is a deployment of Active Directory [MS-ADTS].
Active Directory Federation Services (AD FS): A Microsoft implementation of a federation services provider, which provides a security token service (STS) that can issue security tokens to a caller using various protocols such as WS-Trust, WS-Federation, and Security Assertion Markup Language (SAML) version 2.0.
Active Directory Lightweight Directory Services (AD LDS): A directory service (DS) implemented by a domain controller (DC). AD LDS is a deployment of Active Directory [MS-ADTS]. The most significant difference between AD LDS and Active Directory Domain Services (AD DS) is that AD LDS does not host domain naming contexts (domain NCs). A server can host multiple AD LDS DCs. Each DC is an independent AD LDS instance, with its own independent state. AD LDS can be run as an operating system DS or as a directory service provided by a standalone application (Active Directory Application Mode (ADAM)).
atomic transaction: A shared activity that provides mechanisms for achieving the atomicity, consistency, isolation, and durability (ACID) properties when state changes occur inside participating resource managers.
authentication: The ability of one entity to determine the identity of another entity.
authentication header (AH): An Internet Protocol Security (IPsec) encapsulation mode that provides authentication and message integrity. For more information, see [RFC4302] section 1.
binary large object (BLOB): A collection of binary data stored as a single entity in a database.
class identifier (CLSID): A GUID that identifies a software component; for instance, a DCOM object class or a COM class.
Common Internet File System (CIFS): The "NT LM 0.12" / NT LAN Manager dialect of the Server Message Block (SMB) Protocol, as implemented in Windows NT. The CIFS name originated in the 1990's as part of an attempt to create an Internet standard for SMB, based upon the then-current Windows NT implementation.
Component Object Model (COM): An object-oriented programming model that defines how objects interact within a single process or between processes. In COM, clients have access to an object through interfaces implemented on the object. For more information, see [MS-DCOM].
decryption: In cryptography, the process of transforming encrypted information to its original clear text form.
DirectAccess: A collection of different component policies, including Name Resolution Policy and IPsec, which allows seamless connectivity to corporate resources when not physically connected to the corporate network.
directory service (DS): A service that stores and organizes information about a computer network's users and network shares, and that allows network administrators to manage users' access to the shares. See also Active Directory.
Distributed Component Object Model (DCOM): The Microsoft Component Object Model (COM) specification that defines how components communicate over networks, as specified in [MS-DCOM].
Distributed File System (DFS): A file system that logically groups physical shared folders located on different servers by transparently connecting them to one or more hierarchical namespaces. DFS also provides fault-tolerance and load-sharing capabilities.
domain controller (DC): The service, running on a server, that implements Active Directory, or the server hosting this service. The service hosts the data store for objects and interoperates with other DCs to ensure that a local change to an object replicates correctly across all DCs. When Active Directory is operating as Active Directory Domain Services (AD DS), the DC contains full NC replicas of the configuration naming context (config NC), schema naming context (schema NC), and one of the domain NCs in its forest. If the AD DS DC is a global catalog server (GC server), it contains partial NC replicas of the remaining domain NCs in its forest. For more information, see [MS-AUTHSOD] section 18.104.22.168.2 and [MS-ADTS]. When Active Directory is operating as Active Directory Lightweight Directory Services (AD LDS), several AD LDS DCs can run on one server. When Active Directory is operating as AD DS, only one AD DS DC can run on one server. However, several AD LDS DCs can coexist with one AD DS DC on one server. The AD LDS DC contains full NC replicas of the config NC and the schema NC in its forest. The domain controller is the server side of Authentication Protocol Domain Support [MS-APDS].
Dynamic Host Configuration Protocol (DHCP): A protocol that provides a framework for passing configuration information to hosts on a TCP/IP network, as described in [RFC2131].
Encapsulating Security Payload (ESP): An Internet Protocol security (IPsec) encapsulation mode that provides authentication, data confidentiality, and message integrity. For more information, see [RFC4303] section 1.
encryption: In cryptography, the process of obscuring information to make it unreadable without special knowledge.
endpoint: A network-specific address of a remote procedure call (RPC) server process for remote procedure calls. The actual name and type of the endpoint depends on the RPC protocol sequence that is being used. For example, for RPC over TCP (RPC Protocol Sequence ncacn_ip_tcp), an endpoint might be TCP port 1025. For RPC over Server Message Block (RPC Protocol Sequence ncacn_np), an endpoint might be the name of a named pipe. For more information, see [C706].
extended mode (EM): An optional phase of AuthIP negotiation during which the peers perform a second round of authentication. This phase does not exist in the Internet Key Exchange (IKE) protocol.
firewall rule: A group of settings that specify which connections are allowed into and out of a client computer.
fully qualified domain name (FQDN): An unambiguous domain name that gives an absolute location in the Domain Name System's (DNS) hierarchy tree, as defined in [RFC1035] section 3.1 and [RFC2181] section 11.
Generic Security Services (GSS): An Internet standard, as described in [RFC2743], for providing security services to applications. It consists of an application programming interface (GSS-API) set, as well as standards that describe the structure of the security data.
globally unique identifier (GUID): A term used interchangeably with universally unique identifier (UUID) in Microsoft protocol technical documents (TDs). Interchanging the usage of these terms does not imply or require a specific algorithm or mechanism to generate the value. Specifically, the use of this term does not imply or require that the algorithms described in [RFC4122] or [C706] must be used for generating the GUID. See also universally unique identifier (UUID).
Group Policy Object (GPO): A collection of administrator-defined specifications of the policy settings that can be applied to groups of computers in a domain. Each GPO includes two elements: an object that resides in the Active Directory for the domain, and a corresponding file system subdirectory that resides on the sysvol DFS share of the Group Policy server for the domain.
Hypertext Transfer Protocol (HTTP): An application-level protocol for distributed, collaborative, hypermedia information systems (text, graphic images, sound, video, and other multimedia files) on the World Wide Web.
Hypertext Transfer Protocol Secure (HTTPS): An extension of HTTP that securely encrypts and decrypts web page requests. In some older protocols, "Hypertext Transfer Protocol over Secure Sockets Layer" is still used (Secure Sockets Layer has been deprecated). For more information, see [SSL3] and [RFC5246].
impersonation: The ability of an operating system process or thread to run temporarily in the security context of a specific caller and to gain authorized access to resources using that identity.
Input/output control (IOCTL): Also known as I/O control. A command that is issued to a network device to alter or query the behavior and state of the device.
Internet Key Exchange (IKE): The protocol that is used to negotiate and provide authenticated keying material for security associations (SAs) in a protected manner. For more information, see [RFC2409].
Internet Protocol security (IPsec): A framework of open standards for ensuring private, secure communications over Internet Protocol (IP) networks through the use of cryptographic security services. IPsec supports network-level peer authentication, data origin authentication, data integrity, data confidentiality (encryption), and replay protection.
Internet Protocol version 4 (IPv4): An Internet protocol that has 32-bit source and destination addresses. IPv4 is the predecessor of IPv6.
Internet Protocol version 6 (IPv6): A revised version of the Internet Protocol (IP) designed to address growth on the Internet. Improvements include a 128-bit IP address size, expanded routing capabilities, and support for authentication and privacy.
Internetwork Packet Exchange (IPX): A protocol that provides connectionless datagram delivery of messages. See [IPX].
Inter-Process Communication (IPC): A set of techniques used to exchange data among two or more threads in one or more processes. These processes can also run on one or more computers connected by a network.
local area network (LAN): A group of computers and other devices dispersed over a relatively limited area and connected by a communications link that enables any device to interact with any other device on the network.
mailslot: A mechanism for one-way interprocess communications (IPC). For more information, see [MSLOT] and [MS-MAIL].
main mode (MM): The first phase of an Internet Key Exchange (IKE) negotiation that performs authentication and negotiates a main mode security association (MM SA) between the peers. For more information, see [RFC2409] section 5.
main mode security association (MM SA): A security association that is used to protect Internet Key Exchange (IKE) traffic between two peers. For more information, see [RFC2408] section 2.
Multiple Active Result Sets (MARS): A feature in Microsoft SQL Server that allows applications to have more than one pending request per connection. For more information, see [MSDN-MARS].
named pipe: A named, one-way, or duplex pipe for communication between a pipe server and one or more pipe clients.
negotiation filter association (NFA): A term that is used to describe the logical binding together of the appropriate IPsec filter and IPsec negotiation policy settings for an IPsec policy.
NetBEUI: NetBIOS Enhanced User Interface. NetBEUI is an enhanced NetBIOS protocol for network operating systems, originated by IBM for the LAN Manager server and now used with many other networks.
NetBIOS: A particular network transport that is part of the LAN Manager protocol suite. NetBIOS uses a broadcast communication style that was applicable to early segmented local area networks. A protocol family including name resolution, datagram, and connection services. For more information, see [RFC1001] and [RFC1002].
NetBIOS Name Server (NBNS): A server that stores NetBIOS name-to-IPv4 address mappings and that resolves NetBIOS names for NBT-enabled hosts. A server running the Windows Internet Name Service (WINS) is the Microsoft implementation of an NBNS.
NetBIOS over TCP/IP (NBT): A feature that allows NetBIOS to be used over the TCP/IP protocol, as defined in [RFC1001] and [RFC1002].
Network Access Protection (NAP): A feature of an operating system that provides a platform for system health-validated access to private networks. NAP provides a way of detecting the health state of a network client that is attempting to connect to or communicate on a network, and limiting the access of the network client until the health policy requirements have been met. NAP is implemented through quarantines and health checks, as specified in [TNC-IF-TNCCSPBSoH].
OSF-DCE: The Distributed Computing Environment from the Open Software Foundation. It consists of multiple components, including remote procedure call (RPC), that have been integrated to work closely together.
PeerDist Content Encoding: A way of presenting an HTTP entity-body (defined in [RFC2616]) through its metadata, in the form of a Content Information Data Structure, as defined in [MS-PCCRC] section 2.3, which is derived from the content using algorithms described in [MS-PCCRC] sections 2.1 and 2.2.
print queue: The logical entity to which jobs can be submitted for a particular print device. Associated with a print queue is a print driver, a user's print configuration in the form of a DEVMODE structure, and a system print configuration stored in the system registry.
Quality of Service (QoS): A set of technologies that do network traffic manipulation, such as packet marking and reshaping.
quick mode security association (QM SA): A security association (SA) that is used to protect IP packets between peers (the Internet Key Exchange (IKE) traffic is protected by the main mode security association (MM SA)). For more information, see [RFC2409] section 5.5.
remote procedure call (RPC): A communication protocol used primarily between client and server. The term has three definitions that are often used interchangeably: a runtime environment providing for communication facilities between computers (the RPC runtime); a set of request-and-response message exchanges between computers (the RPC exchange); and the single message from an RPC exchange (the RPC message). For more information, see [C706].
RPC transport: The underlying network services used by the remote procedure call (RPC) runtime for communications between network nodes. For more information, see [C706] section 2.
Secure Sockets Layer (SSL): A security protocol that supports confidentiality and integrity of messages in client and server applications that communicate over open networks. SSL supports server and, optionally, client authentication using X.509 certificates [X509] and [RFC5280]. SSL is superseded by Transport Layer Security (TLS). TLS version 1.0 is based on SSL version 3.0 [SSL3].
security association (SA): A simplex "connection" that provides security services to the traffic carried by it. See [RFC4301] for more information.
security identifier (SID): An identifier for security principals that is used to identify an account or a group. Conceptually, the SID is composed of an account authority portion (typically a domain) and a smaller integer representing an identity relative to the account authority, termed the relative identifier (RID). The SID format is specified in [MS-DTYP] section 2.4.2; a string representation of SIDs is specified in [MS-DTYP] section 2.4.2 and [MS-AZOD] section 22.214.171.124.
security policy database (SPD): A database that specifies the policies that determine the disposition of all IP traffic inbound or outbound from a host or security gateway.
selector: A name/value pair that represents a particular instance of a resource; essentially a filter or "key" that identifies the desired instance of the resource.
Server Message Block (SMB): A protocol that is used to request file and print services from server systems over a network. The SMB protocol extends the CIFS protocol with additional security, file, and disk management support. For more information, see [CIFS] and [MS-SMB].
small computer system interface (SCSI): A set of standards for physically connecting and transferring data between computers and peripheral devices.
SOAP: A lightweight protocol for exchanging structured information in a decentralized, distributed environment. SOAP uses XML technologies to define an extensible messaging framework, which provides a message construct that can be exchanged over a variety of underlying protocols. The framework has been designed to be independent of any particular programming model and other implementation-specific semantics. SOAP 1.2 supersedes SOAP 1.1. See [SOAP1.2-1/2003].
transaction: A unit of interaction that guarantees the ACID properties— atomicity, consistency, isolation, and durability—as specified by the MSDTC Connection Manager: OleTx Transaction Protocol ([MS-DTCO])
Transmission Control Protocol (TCP): A protocol used with the Internet Protocol (IP) to send data in the form of message units between computers over the Internet. TCP handles keeping track of the individual units of data (called packets) that a message is divided into for efficient routing through the Internet.
Transport Layer Security (TLS): A security protocol that supports confidentiality and integrity of messages in client and server applications communicating over open networks. TLS supports server and, optionally, client authentication by using X.509 certificates (as specified in [X509]). TLS is standardized in the IETF TLS working group.
unicast: A delivery method used by media servers for providing content to connected clients in which each client receives a discrete stream that no other client has access to.
Universal Naming Convention (UNC): A string format that specifies the location of a resource. For more information, see [MS-DTYP] section 2.2.57.
User Datagram Protocol (UDP): The connectionless protocol within TCP/IP that corresponds to the transport layer in the ISO/OSI reference model.
virtual disk file: The file that is the backing store for a virtual disk. This file may be exposed to an operating system as a disk device. The exposed disk device is referred to as a virtual disk.
virtual private network (VPN): A network that provides secure access to a private network over public infrastructure.
Voice over IP (VoIP): The use of the Internet Protocol (IP) for transmitting voice communications. VoIP delivers digitized audio in packet form and can be used to transmit over intranets, extranets, and the Internet.
Windows Internet Name Service (WINS): A name service for the NetBIOS protocol, particularly designed to ease transition to a TCP/IP based network. An implementation of an NBNS server.
Windows Server Update Services (WSUS): An optional component that enables a machine to operate as an update server.
MAY, SHOULD, MUST, SHOULD NOT, MUST NOT: These terms (in all caps) are used as defined in [RFC2119]. All statements of optional behavior use either MAY, SHOULD, or SHOULD NOT.