DAP: Data Access Protocol
Data Access Protocol (DAP) is a protocol in the Digital Network Architecture to provide remote file access to systems supporting the DECnet.
Standard Organization: DEC/HP
DAP: Directory Access Protocol
Directory Access Protocol (DAP), defined in ISO X.500, is a global directory service. Its components cooperate to manage information about objects such as countries, organizations, people, machines, and so on in a worldwide scope. It provides the capability to look up information by name (a white-page service) and to browse and search for information (a yellow-page service). A subset of X.500 is used to define the Lightweight Directory Access Protocol (LDAP), which supports TCP/IP. LDAP is more popular in real implementation.
Standard Organization: ISO&ITU
Reference Document: ISO
DCAP: Data Link Switching Client Access Protocol
The Data Link Switching Client Access Protocol (DCAP) is an application layer protocol used between workstations and routers to transport SNA/NetBIOS traffic over TCP sessions. DCAP was introduced to address a few deficiencies in the Data Link Switching Protocol (DLSw). The implementation of the Data Link Switching Protocol (DLSw) on a large number of workstations raises the important issues of scalability and efficiency.
Standard Organization: IETF
Reference Document: RFC 2114
DCE/RPC: Distributed Computing Environment / Remote Procedure Calls
Distributed Computing Environment / Remote Procedure Calls (DCE/RPC), commissioned by the Open Software Foundation in a "Request for Technology, includes a group of technologies to call procedures from one application in another application over the network, without having to know about what computer the other application is running on. The usual underlying concerns of a Remote Procedure Call system, such as how, where, who, security and encryption are all hidden behind an extremely well-defined interface. DCE/RPC's reference implementation (version 1.1) is available under the BSD-compatible (Free Software) OSF/1.0 license, and is available for at least Solaris, AIX and VMS.
Standard Organization: Open Software Foundation
DCOP: Desktop COmmunication Protocol
Desktop COmmunication Protocol(DCOP) is a light-weight interprocess and software componentry communication system. DCOP allows applications to interoperate, and to share complex tasks. Essentially, DCOP is a "remote control" system, which allows an application or a script to enlist the help of other applications. It is built on top of the X Window System's Inter-Client Exchange protocol. K Desktop Environment (KDE) applications and the KDE libraries make heavy use of DCOP, and most of the KDE applications can be controlled by scripts via the DCOP mechanism.
DCP: Data Compression Protocol over Frame Relay
Data Compression Protocol (DCP), defined in FRF.9, defines data compression over Frame Relay. The compression mechanisms can be implemented on both switched virtual circuits (SVC) and permanent virtual circuits (PVC). Their use is negotiated at the time the Frame Relay data link connection identifier (DLCI) is initiated. It applies to unnumbered information (UI) frames encapsulated using Q.933 Annex E and FRF.3.1. It may be used on Frame Relay connections that are interworked with ATM using FRF.5. DCP is logically decomposed into two sublayers: the DCP Control sublayer, and the DCP Function sublayer.
Standard Organization: ITU-T
Reference Document: FRF.9
DCPCP: Data Compression Protocol Control Protocol
Data Compression Protocol Control Protocol (DCPCP) is used to enable, disable, and optionally configure Data Compression Protocol (DCP). DCPCP has two modes of operation: Mode-1 operation is required; Mode-2 operation is optional. Mode-2 provides full negotiation capabilities to enable, disable, and configure DCP using the Point-to-Point Protocol (PPP) Link Control Protocol (LCP) negotiation procedures. Mode-1 uses a subset of the Mode-2 negotiation primitives with simplified procedures to enable and disable DCP with the default DCFD and default parameter values.
Standard Organization: IETF
DDDS: Dynamic Delegation Discovery System
The Dynamic Delegation Discovery System (DDDS) defines a mechanism for using Domain Name System (DNS) as the database for arbitrary identifier schemes. DDDS is used to implement lazy binding of strings to data, in order to support dynamically configured delegation systems. The DDDS functions by mapping some unique string to data stored within a DDDS Database by iteratively applying string transformation rules until a terminal condition is reached. Enum(E164 NUmber Mapping) is defines as a DDDS application to resolve phone numbers into data stored in DNS.
Standard Organization: IETF
Reference Document: RFC 3401
DDP: Datagram Delivery Protocol
Datagram Delivery Protocol (DDP), a protocol in the AppleTalk suite, is for socket-to-socket delivery of datagrams over an AppleTalk network. DDP was the lowest-level data-link-independent transport protocol. It provided a datagram service with no guarantees of delivery. All application-level protocols in the AppleTalk suite, including the infrastructure protocols NBP, RTMP and ZIP, were built on top of DDP.
Standard Organization: Apple
DECnet:
DECnet is a protocol suite developed and supported by Digital Equipment Corporation (Digital or DEC, now part of HP). Several versions of DECnet have been released. The original DECnet allowed two directly attached minicomputers to communicate. Subsequent releases expanded the DECnet functionality by adding support for additional proprietary and standard protocols. Currently, two versions of DECnet are in wide use: DECnet Phase IV and DECnet plus (DECnet V). The DECnet now is part of the HP OpenVMS.
Standard Organization: DEC/HP
DHCP: Dynamic Host Configuration Protocol
Dynamic Host Configuration Protocol (DHCP) is a communications protocol enabling network administrators to manage centrally, and to automate, the assignment of IP addresses in a network. In an IP network, each device connecting to the Internet needs a unique IP address. DHCP lets a network administrator supervise and distribute IP addresses from a central point and automatically sends a new IP address when a computer is plugged into a different place in the network.
Standard Organization: IETF
Reference Document: RFC 2131 and RFC 3396
DIAG: Diagnostic Responder protocol
Diagnostic Responder protocol (DIAG), a protocol in the Novell NetWare suite, is used for connectivity testing and information gathering. By default, Novell NetWare clients use the Diagnostic Responder to reply to diagnostic requests.
Standard Organization: Novell
DiffServ
DiffServ defines an architecture for implementing scalable service differentiation in the Internet. A "Service" defines some significant characteristics of packet transmission in one direction across a set of one or more paths within a network. These characteristics may be specified in quantitative or statistical terms of throughput, delay, jitter and/or loss, or may otherwise be specified in terms of some relative priority of access to network resources.
Standard Organization: IETF
Reference Document: RFC 2474 and RFC 2475
DISL: Dynamic Inter-Switch Link Protocol
Dynamic Inter-Switch Link Protocol (DISL), a Cisco protocol, simplifies the creation of an ISL trunk from two interconnected Fast Ethernet devices. Fast EtherChannel technology enables aggregation of two full-duplex Fast Ethernet links for high-capacity backbone connections. DISL minimizes VLAN trunk configuration procedures because only one end of a link needs to be configured as a trunk.
Standard Organization: Cisco
DLSw: Data-link switching
Data-link switching (DLSw) provides a forward mechanism for transporting IBM Systems Network Architecture (SNA) and network basic input/output system (NetBIOS) traffic over an IP network. DLSw does not provide full routing, but instead provides switching at the SNA Data Link layer (i.e., layer 2 in the SNA architecture) and encapsulation in TCP/IP for transport over the Internet.
Standard Organization: IBM
DMDP: DNSIX Message Deliver Protocol
DNSIX Message Deliver Protocol(DMDP) provides a basic message-delivery mechanism for all DOD Network Security for Information Exchange (DNSIX) elements
DNA: Digital Network Architecture
Digital Network Architecture (DNA), defined by Digital Equipment Corporation now part of HP, is essentially a set of documents which define the network architecture in general, states the specifications for each layer of the architecture, and describes the protocols which operate within each layer.
Standard Organization: DEC/HP
DNCP: DECnet (DNA) Phase IV Control Protocol
DECnet Phase IV Control Protocol (DNCP), also known as DNA Phase IV Routing Control Protocol (DNCP), is responsible for configuring, enabling, and disabling the DNA Phase IV Routing protocol modules on both ends of the point-to-point link (PPP). DNCP uses the same packet exchange mechanism as the Link Control Protocol (LCP). DNCP packets may not be exchanged until PPP has reached the Network-Layer Protocol phase. DNCP packets received before this phase is reached should be silently discarded.
Standard Organization: DEC/HP
DNS: Domain Name System or Service
Domain Name System or Service (DNS) is a distributed Internet directory service. DNS is used mostly to translate between domain names and IP addresses and to control Internet email delivery. Most Internet services rely on DNS to work, and if DNS fails, web sites cannot be located and email delivery stalls.
Standard Organization: IETF
Reference Document: RFC 1034
DOCSIS: Data Over Cable Service Interface Specification
Data Over Cable Service Interface Specification (DOCSIS), developed by CableLabs and approved by the ITU, defines interface requirements for cable modems involved in high-speed data distribution (both MPEG and IP data) over cable television system networks. Other devices that recognize and support the DOCSIS standard include HDTVs and Web-enabled set-top boxes for regular televisions.
Standard Organization: CableLab
Reference Document: ITU J.112
DQDB: Distributed Queue Dual Bus
Distributed Queue Dual Bus (DQDB) is a Data-link layer communication protocol for Metropolitan Area Networks (MANs), specified in the IEEE 802.6 standard and designed for use in MANs. DQDB is designed for data as well as voice and video transmission and is based on cell switching technology (similar to ATM). DQDB, which permits multiple systems to interconnect using two unidirectional logical buses, is an open standard that is designed for compatibility with carrier transmission standards such as SMDS.
Standard Organization: IEEE
Reference Document: IEEE 802.6
DRARP: Dynamic Reverse Address Resolution Protocol
Dynamic Reverse Address Resolution Protocol (DRARP), an extensions to the Reverse Address Resolution Protocol (RARP), is used to acquire (or allocate) a protocol level address given the fixed hardware address for a host. Its clients are systems being installed or reconfigured, and its servers are integrated with other network administration services. The protocol, along with adjunct protocols as briefly described here, supports several common styles of "Intranet" administration including networks which choose not to support the simplified installation and reconfiguration features enabled by DRARP.
Standard Organization: IETF
DRIP: Duplicate Ring Protocol
Duplicate Ring Protocol (DRIP), a Cisco protocol, runs on Cisco routers and switches that support Virtual LAN networking, and is used to identify active Token Ring VLANs. DRIP information is used for all-routes explorer filtering and detecting the configuration of duplicate Token ring Concentrator Relay Function (TrCRF) across routers and switches, which would cause a TrCRF to be distributed across ISL trunks. DRIP sends advertisements to a multicast address so the advertisements are received by all neighboring devices. The advertisement includes VLAN information for the source device only.
Standard Organization: Cisco
DRP: Director Response Protocol
The Director Response Protocol (DRP) is a simple User Datagram Protocol (UDP)-based application developed by Cisco Systems. It enables Cisco's DistributedDirector product to query routers (DRP Server Agents) in the field for Border Gateway Protocol (BGP) and Interior Gateway Protocol (IGP) routing table metrics between distributed servers and clients.
Standard Organization: Cisco
DS0: Digital Signal level 0
Digital Signal level 0 (DS0) is a basic digital signaling rate of 64 kbit/s, corresponding to the capacity of one voice-frequency-equivalent channel. The DS0 forms the basic unit for the digital multiplex transmission hierarchy in both the European and North American systems. The DS0 rate may support twenty 2.4 kbit/s channels, ten 4.8 kbit/s channels, five 9.67 kbit/s channels, one 56 kbit/s channel, or one 64 kbit/s clear channel.
Standard Organization: ANSI
DS1: Digital Signal level 1
Digital Signal level 1 (DS1) is a T-carrier signaling scheme devised by Bell Labs. Technically, DS1 is the data transmitted over a physical T1 line, however, the terms DS1 and T1 are often used interchangeably. A DS1 circuit is made up of twenty-four 8-bit channels (DS0's), each channel being a 64 kbit/s DS0 multiplexed pseudo-circuit. A DS1 is also a full-duplex circuit, meaning you can (in theory) send 1.536 Mbit/s and receive 1.536 Mbit/s simultaneously. A total of 1.536 Mbit/s of bandwidth is achieved by sampling each of the twenty-four 8-bit DS0's 8000 times per second. It is a widely used standard in telecommunications in North America and Japan to transmit voice and data between devices. E1 is used in place of T1 outside of North America and Japan.
Standard Organization: ANSI
DS3: Digital Signal level 3
Digital Signal level 3 (DS3) is a digital signal level 3 T-carrier and it is also called T3. The data rate for this type of signal is 44.736 Mbit/s. DS3 can transport 28 DS1 level signals or transport 672 DS0 level channels within its payload. DS3 is a standard for North America and Japan. Other part of the world uses a similar standard called E3.
Standard Organization: ANSI
DSL: Digital Subscribe Line
Digital Subscriber Line(DSL) is a modem technology for broadband data access over ordinary copper telephone lines (POTS) from homes to businesses. There are many flavors of DSL, collectively called xDSL, such as ADSL (and G.Lite), HDSL, SDSL, IDSL and VDSL etc. xDSLs sometimes are referred to as last-mile (or first mile) technologies because they are used only for connections from a telephone switching station to a home or office, not between switching stations.
Standard Organization: ANSI
DSMCC: Digital Storage Media Command and Control
Digital Storage Media Command and Control (DSM-CC), Part 6 of MPEG-2, is an ISO/IEC standard developed to provide the control functions and operations specific to managing MPEG-1 and MPEG-2 bitstreams. These protocols may be used to support applications in both stand-alone and heterogeneous network environments. In the DSM-CC model, a stream is sourced by a Server and delivered to a Client. Both the Server and the Client are considered to be Users of the DSM-CC network. DSM-CC defines a logical entity called the Session and Resource Manager (SRM) which provides a (logically) centralized management of the DSM-CC Sessions and Resources.
Standard Organization: ANSI/ITU
DSn: Digital Signal Level n
Digital Signal Level n (DSn), also known as Tn, is a group of classification of digital circuits. The DS technically refers to the rate and the format of the signal, whereas the T designation refers to the equipment providing the signals. In practice, DS and T are used synonymously; for example, DS1 and T1, DS3 and T3.
Standard Organization: ANSI
DTP: Dynamic Trunking Protocol
Dynamic Trunking Protocol (DTP), a Cisco proprietary protocol in the VLAN group, is for negotiating trunking on a link between two devices and for negotiating the type of trunking encapsulation (802.1Q) to be used.There are different types of trunking protocols. If a port can become a trunk, it may also have the ability to trunk automatically and, in some cases, even negotiate what type of trunking to use on the port. This ability to negotiate the trunking method with the other device is called dynamic trunking.
Standard Organization: Cisco
DUP: Data User Part
Data User Part (DUP), an application protocol in the SS7/C7 protocol suite, defines the necessary call control and facility registration and cancellation related elements for circuit-switched data transmission services.
Standard Organization: ANSI/ITU-T
DUNDi: Distributed Universal Number Discovery
Distributed Universal Number Discovery (DUNDi) is a Peer-to-Peer (P2P) protocol for providing services equivalent to those provided by Electronic Numbering (ENUM). DUNDi has an advantage above ENUM because that it is far more resilient, as it lacks a central point of failure. DUNDi can be used to augment DNS and it is developed with Voice over IP (VOIP) services.
Standard Organization: IETF
DVMRP: Distance Vector Multicast Routing Protocol
Distance Vector Multicast Routing Protocol (DVMRP) is an Internet routing protocol that provides an efficient mechanism for connectionless message multicast to a group of hosts across an internetwork. DVMRP is an "interior gateway protocol" (IGP); suitable for use within an autonomous system but not between different autonomous systems.
Standard Organization: IETF
Reference Document: RFC 1075
Dynamic IISP
Dynamic Interim-Interswitch Signaling Protocol (Dynamic IISP) is a dynamic version of the ATM Forum standard Interim Inter-Switch Signaling Protocol, that automatically reroutes ATM connections in the event of link failures. Dynamic IISP was an interim solution until PNNI Phase 1 was completed.