D


daemon

Background process that performs operations on behalf of the system software and hardware. Daemons normally start when the system software is booted , and they run as long as the software is running. In the JUNOS software, daemons are also referred to as processes.



damping

Method of reducing the number of update messages sent between BGP peers, thereby reducing the load on these peers without adversely affecting the route convergence time for stable routes.



data circuit-terminating equipment
See [DCE]
data-link connection identifier
See [DLCI]
data service unit
See [CSU/DSU]
Data Terminal Equipment
See [DTE]
dcd

The JUNOS software interface process (daemon).



DCE

Data circuit-terminating equipment. RS-232-C device, typically used for a modem or printer, or a network access and packet switching node.



default address

Router address that is used as the source address on unnumbered interfaces.



denial of service
See [DoS]
designated router

In OSPF, a router selected by other routers that is responsible for sending link-state advertisements that describe the network, which reduces the amount of network traffic and the size of the routers' topological databases.



destination prefix length

Number of bits of the network address used for host portion of a CIDR IP address.



DHCP

Dynamic Host Configuration Protocol. Allocates IP addresses dynamically so that they can be reused when they are no longer needed.



Dijkstra algorithm
See [SPF]
DIMM

Dual-inline memory module. 168-pin memory module that supports 64-bit data transfer.



direct routes
See [interface routes]
DLCI

Data-link connection identifier. Identifier for a Frame Relay virtual connection (also called a logical interface ).



DoS

Denial of service. System security breach in which network services become unavailable to users.



DRAM

Dynamic random-access memory. Storage source on the router that can be accessed quickly by a process.



DSU

Data service unit. A device used to connect a DTE to a digital phone line. Converts digital data from a router to voltages and encoding required by the phone line.

See also [CSU/DSU]


DTE

Data Terminal Equipment. RS-232-C interface that a computer uses to exchange information with a serial device.



DVMRP

Distance Vector Multicast Routing Protocol. Distributed multicast routing protocol that dynamically generates IP multicast delivery trees using a technique called reverse path multicasting (RPM) to forward multicast traffic to downstream interfaces.



Dynamic Host Configuration Protocol
See [DHCP]


Juniper Networks Field Guide and Reference
Juniper Networks Field Guide and Reference
ISBN: 0321122445
EAN: 2147483647
Year: 2002
Pages: 185

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