Lantronix XPress-DR-IAP Guía de usuario descargar pdf (Pagina 136)

Glossary of Terms

Communication Server:

A dedicated, standalone system that manages communications activities for other computers.

Cut-through:

Technique for examining incoming packets whereby an Ethernet switch looks only at the first few

bytes of a packet before forwarding or filtering it. This process is faster than looking at the whole

packet, but it also allows some bad packets to be forwarded.

CSMA/CD:

Carrier Sense Multiple Access with Collision Detection is the Ethernet media access method. All

network devices contend equally for access to transmit. If a device detects another device's signal

while it is transmitting, it aborts transmission and retries after a brief pause.

Data Link:

A logical connection between two nodes on the same circuit.

Data Link Layer:

Dynamic addressing simplifies network administration because the software keeps track of IP

addresses rather than requiring an administrator to manage the task. This means that a new computer

can be added to a network without the hassle of manually assigning it a unique IP address. Many ISPs

use dynamic IP addressing for dial-up users.

Layer 2 of the seven-layer OSI reference model for communication between computers on networks.

This layer defines protocols for data packets and how they are transmitted to and from each network

device. It is a medium-independent, link-level communications facility on top of the Physical layer,

and is divided into two sublayers: medium-access control (MAC) and logical-link control (LLC).

DHCP

Short for Dynamic Host Configuration Protocol, a protocol for assigning dynamic IP addresses to

devices on a network. With dynamic addressing, a device can have a different IP address every time it

connects to the network. In some systems, the device's IP address can even change while it is still

connected. DHCP also supports a mix of static and dynamic IP addresses.

DHCP client support is built into Windows 95 and NT workstation. NT 4 server includes both client

and server support.

Dial on Demand:

When a router detects the need to initiate a dial-up connection to a remote network, it does so

automatically according to pre-defined parameters set by the network manager.

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