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IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.5 455

Glossary

This chapter provides definitions for Device Server terms.

BOOTP (BOOTstrap

Protocol)

An Internet protocol that enables a diskless workstation to discover its own IP address, the IP

address of a BOOTP server on the network, and a file to be loaded into memory to boot the

machine. This enables the workstation to boot without requiring a hard or floppy disk drive.

Callback A security feature where the Device Server calls back the User at a predetermined number

defined in the User’s account.

CHAP (Challenge

Handshake

Authentication

Protocol)

Standard authentication protocol for PPP connections. It provides a higher level of security than

PAP and should be used whenever possible. see PAP

Community (SNMP) An SNMP community is the group that devices and management stations running SNMP belong

to. It helps define where information is sent.

DHCP (Dynamic Host

Configuration

Protocol)

A TCP/IP protocol that provides static and dynamic address allocation and management.

Direct Connection Connections that bypass the Device Server enabling the user to log straight into a specific host.

A direct connection is recommended where a user logging in to the Device Server is not

required.

Ethernet A high-speed (10Mbps,100Mbps) cable technology that connects devices to a LAN, using one

or more sets of communication protocols.

Fixed Callback A method where there is a specific number defined to callback a user.

Local Authentication Uses the user ID and password stored within the Device Server User database.

LPD Line Printer Daemon. A printer protocol that uses TCP/IP to establish connections between

printers and workstations on a network. The technology was developed originally for BSD

UNIX and has since become the de facto cross-platform printing protocol.

Modem Initialization

String

A series of commands sent to the modem by a communications program at start up. These

commands tell a modem how to set itself up in order to communicate easily with another

modem.

MOTD Message of the day. This is defined by a file whose contents display when users log into the

Device Server.

Multicast The broadcasting of messages to a specified group of workstations on a LAN, WAN, or internet.

NAK (Negative

Acknowledgment)

A communication control character sent by the receiving destination indicating that the last

message was not received correctly.

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