Technical data

for the multiaccess network and assists in running the protocol. The designated
router is elected by the HELLO protocol.
destination address
The IP address that specifies where a datagram is to be sent; contains the network
and host identifiers.
Any network or host.
destination port
A 2-octet value in the TCP and UDP header field that identifies the destination
upper-level protocol for a packet’s data.
device driver
The software associated with each physical device; serves as the interface between
the operating system and the device controller.
device socket
The extension of the pseudodevice, used for communications; consists of the
Internet pseudodevice and the socket. See also pseudodevice.
DHCP
See Dynamic Host Configuration Protocol.
dialogue
The sequence of message exchanges between open systems that represents a single
association and the set of underlying connections.
dialup
A temporary (as opposed to dedicated) network connection established through a
telephonelinewithamodem.
dialup provider
A host that responds to incoming PPP connection requests. A PPP server.
DIGITAL Command Language (DCL)
The command interface of the OpenVMS operating system.
Compaq TCP/IP Services for OpenVMS
The Compaq software product implemented on OpenVMS as an ancillary control
process (ACP) and a network device driver (BG driver) with executive-level
components and user applications that use TCP/IP protocols.
distance
An EGP metric. See metric and EGP. Valid values are from 0 to 255 inclusive.
Distributed Computing Environment (DCE)
An architecture of standard programming interfaces, conventions, and server
functions (for example, naming, distributed file system, remote procedure call)
for transparently distributing applications across networks of heterogeneous
computers.
distributed database
A collection of several different data repositories that look like a single database to
the user. The Domain Name System (DNS) is a distributed database.
distributed management
A form of network management in which network managers and management
software are dispersed across many systems.
Glossary–13