- data-link connection identifier (DLCI)
- See [DLCI]
- decimal digit
In mathematics, a digit or numeral that is part of a number
based on the decimal numbering systemnamely 0, 1, 2, 3, 4, 5, 6, 7, 8, and
- decimal numbering system
In mathematics, a convention for numbering things in which ten
separate numerals are used.
DECnet was Digital Equipment Corporation's proprietary
The process of re-creating the original data that was
transmitted over a network after being encrypted by the sender of the
- default gateway
- See [default
- default router
A setting on a TCP/IP host that refers to the IP address of a
router. The host sends packets to this default router, expecting the router to
then be able to forward the packet to the destination.
- default web page
- See [home
The act of interpreting a received analog electrical signal to
decode a binary 0 or 1.
- denial of service attack
An action that a cracker takes to cause a service or server to
have problems, or possibly fail, which then denies legitimate users the
opportunity to use the service.
- Destination Address field
The 6-byte long portion of an Ethernet header in which a NIC
places the intended recipient's Ethernet address before sending a
- destination IP address
A field in the IP header that lists the IP address of the
intended recipient of the packet.
In mathematics, a single symbol that can be used to represent
part of a number; for instance, the digit "1" is part of the number "321."
Another word for numeral.
- digital subscriber line (DSL)
- See [DSL]
- directly connected route
A route that refers to a network or subnet that is connected to
an interface on that router.
- directly connected subnet
A subnet for which a router has a working physical interface
connected to the physical network where the subnet
- directory assistance
A service from a phone company by which you call a well-known
phone number and get help in finding someone's phone
- disk drive
A component of a computer that can permanently hold the
contents of computer files.
- DIX Ethernet
A term referring to the original Ethernet standard, as
developed by people at Digital Equipment Corporation, Intel, and
- DLCI (data-link connection identifier)
A Frame Relay address used in Frame Relay headers to identify
A LAN where servers are installed in an enterprise network,
with those servers available to users on the Internet. This allows separation of
servers intended for internal use only (on the inside) from the servers that are
available to the general public (on the DMZ).
- DMZ interface
An interface on a firewall that is connected to the DMZ LAN. It
is considered to be more secure than the outside but less secure than the
- DNS (Domain
The protocols and conventions that define a worldwide,
distributed TCP/IP host name database, which allows a client computer to use
host names, request name resolution, and get a correct response that identifies
the IP address that corresponds to the name.
- DNS resolution request
A DNS protocol message, sent by an end user host to a DNS
server, that supplies a TCP/IP host name and requests the corresponding IP
- DNS resolver
A TCP/IP host that makes a DNS resolution request, asking for
resolution between a host name and the corresponding IP
- DNS server
A computer running DNS server software, providing name
The set of computers whose names all end with the same domain
- domain name
A term referring to a suffix of a host name that identifies the
authority, organization, or company that controls all names that end in that
- Domain Name System (DNS)
- See [DNS]
- Dot 1 Q
Jargon referring to the IEEE 802.1Q standard of VLAN
Jargon that refers to businesses that are primarily Internet
based. The term refers to the top-level domain (.com) of their respective domain
- dotted decimal format
A term referring to the format of TCP/IP addresses when written
A file transfer in which the computer receives or gets a file
that it did not previously have a copy of.
- DSL (digital
Public network technology that delivers high bandwidth over
conventional copper wiring at limited distances. The most common types of DSL
are ADSL, HDSL, SDSL, and VDSL. Because most DSL technologies do not use the
complete bandwidth of the twisted pair, there is room remaining for a voice
- DSL access multiplexer (DSLAM)
- See [DSLAM]
- DSL modem
A device that generates and receives data over a local phone
- DSLAM (DSL
A device, typically found at a telco CO, that splits the
digital signals sent by DSL modems to a router and splits the voice signals out
to a telephone switch.
- dynamically assigned port
A port number that is chosen at the TCP client computer. The
computer simply chooses a currently unused port number.
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