Γλωσσάρι Δικτυακών Ορολογιών
Ταξινομημένα προς το παρόν Κατά τελευταία ενημέρωση (αύξουσα) Ταξινόμηση χρονολογικά: Κατά τελευταία ενημέρωση
ISOInternational
Organization for Standardization.
International organization that is responsible for a wide range of
standards, including those relevant to networking. ISO developed the
OSI reference model, a popular networking reference model. |
jitterAnalog communication line
distortion caused by the variation of a signal from its
reference timing positions. Jitter can cause data loss,
particularly at high speeds. |
jumper1.)Term used for patchcords
found in a wiring closet. 2.)Electrical switch consisting of a number of pins and a connector that can be attached to the pins in a variety of different ways. Different circuits are created by attaching the connector to different pins. | |
KBkilobyte. | |
KBpskilobytes per
second. | |
Keepalive internalPeriod of time
between each keepalive message sent by a network device. | |
Keepalive messageMessage sent by one
network device to inform another network device that the
virtual circuit between the two is still active. | |
KermitPopular
file-transfer and terminal-emulation program. | |
LANLocal-area
network. High-speed, low-error data network
covering a relatively small geographic area (up to a few
thousand meters). LANs connect workstations, peripherals,
terminals, and other devices in a single building or other
geographically limited area. LAN standards specify cabling
and signaling at the physical and data link layers of the
OSI model. Ethernet, FDDI, and Token Ring are widely used
LAN technologies. | |
LAN SwitchHigh-speed switch
that forwards packets between data-link segments. Most LAN
switches forward traffic based on MAC addresses. This
variety of LAN switch is sometimes called a frame switch.
LAN switches are often categorized according to the method
they use to forward traffic: cut-through packet switching or
store-and-forward packet switching. Multilayer switches are
an intelligent subset of LAN switches. | |
LAPBLink Access
Procedure, Balanced. Data link layer protocol in
the X.25 protocol stack. LAPB is a bit-oriented protocol
derived from HDLC. | |
LAPDLink Access
Procedure on the D channel. ISDN data link layer
protocol for the D channel. LAPD was derived from the LAPB
protocol and is designed primarily to satisfy the signaling
requirements of ISDN basic access. Defined by ITU-T
Recommendations Q.920 and Q.921. | |
laserLight
amplification by stimulated emission of radiation.
Analog transmission device in which a suitable active
material is excited by an external stimulus to produce a
narrow beam of coherent light that can be modulated into
pulses to carry data. Networks based on laser technology are
sometimes run over SONET. |
latency1. Delay between the
time a device requests access to a network and the time it
is granted permission to transmit. 2. Delay between the time when a device receives a frame and the time that frame is forwarded out the destination port. |
leased lineTransmission line
reserved by a communications carrier for the private use of
a customer. A leased line is a type of dedicated line. |
line of sightCharacteristic of
certain transmission systems such as laser, microwave, and
infrared systems in which no obstructions in a direct path
between transmitter and receiver can exist. | |
linkNetwork
communications channel consisting of a circuit or
transmission path and all related equipment between a sender
and a receiver. Most often used to refer to a WAN
connection. Sometimes referred to as a line or a transmission
link. | |
load balancingIn routing, the
ability of a router to distribute traffic over all its
network ports that are the same distance from the
destination address. Good load-balancing algorithms use both
line speed and reliability information. Load balancing
increases the utilization of network segments, thus
increasing effective network bandwidth. |
LLCLogical Link
Control. Higher of the two data link layer
sublayers defined by the IEEE. The LLC sublayer handles
error control, flow control, framing, and MAC-sublayer
addressing. The most prevalent LLC protocol is IEEE 802.2,
which includes both connectionless and connection-oriented
variants. |
MACMedia Access Control.
Lower of the two sublayers of the data link layer defined by the
IEEE. The MAC sublayer handles access to shared media, such as
whether token passing or contention will be used. | |