Motorola Netopia 7000, Руководство администратора

Страница: 333 / 368

333
compression.
Operation per formed on a data set that reduces its size to improve storage or transmission
rate.
CPIP.
C arrier P igeon I nternet P rotocol. RFC 1149 - Standard for the transmission of IP datagrams on avian
carriers. The IP datagram is printed, on a small scroll of paper, in hexadecimal, with each octet separated
by whitestuff and blackstuff. The scroll of paper is wrapped around one leg of the avian carrier. A band of
duct tape is used to secure the datagram's edges. The bandwidth is limited to the leg length. The MTU is
variable, and paradoxically, generally increases with increased carrier age. A typical MTU is 256 milligrams.
Some datagram padding may be needed. Upon receipt, the duct tape is removed and the paper copy of the
datagram is optically scanned into an electronically transmittable form.
crossover cable.
Cable that lets you connect a por t on one Ethernet hub to a por t on another Ethernet
hub. You can order an Ethernet crossover cable from Netopia, if needed.
CSU/DSU.
Channel Ser vice Unit/Data Ser vice Unit. Device responsible for connecting a digital circuit, such
as a T1 link, with a terminal or data communications device.
-----D-----
data bits.
Number of bits used to make up a character.
datagram.
Logical grouping of information sent as a network-layer unit. Compare frame, packet.
DCE.
Digital Communication Equipment. Device that connects the communication circuit to the network
end node (DTE). A modem and a CSU/DSU are examples of a DCE.
dedicated line.
Communication circuit that is used exclusively to connect two network devices. Compare
dial on demand.
DES. D
ata
E
ncr yption
S
tandard is a 56-bit encr yption algorithm developed by the U.S. National Bureau of
Standards (now the National Institute of Standards and Technology).
3DES.
Triple DES, with a 168 bit encr yption key, is the most accepted variant of DES.
DH Group.
Diffie-Hellman is a public key algorithm used between two systems to determine and deliver
secret keys used for encr yption. Groups 1, 2 and 5 are suppor ted. Also, see Diffie-Hellman listing.
DHCP.
Dynamic Host Configuration Protocol. A network configuration protocol that lets a router or other
device assign IP addresses and supply other network configuration information to computers on your net-
work.
dial on demand.
Communication circuit opened over standard telephone lines when a network connection
is needed.
Diffie-Hellman.
A group of key-agreement algorithms that let two computers compute a key independently
without exchanging the actual key. It can generate an unbiased secret key over an insecure medium.
diffserv.
Differentiated Ser vices. A method for controlling Quality of Ser vice (QoS) queue priority settings. It
allows a Gateway to make Quality of Ser vice (QoS) decisions about what path Internet traffic, such as Voice
over IP (VoIP), should travel across your network.