Lantronix Device Server UDS 10 Uživatelský manuál stáhnout pdf (Strana 126)

Glossary of Terms

11-4

UDS-10 User Guide

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:

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.

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.

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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Lantronix Device Server UDS 10 Uživatelský manuál Strana 126