Perle Systems 5500161-40 manual Glossary

Glossary

This chapter provides definitions for Device Server terms.

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

Protocol)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	Standard authentication protocol for PPP connections. It provides a higher level of security than
Handshake	PAP and should be used whenever possible. see PAP
Authentication
Protocol)
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	A TCP/IP protocol that provides static and dynamic address allocation and management.
Configuration
Protocol)
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	A series of commands sent to the modem by a communications program at start up. These
String	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	A communication control character sent by the receiving destination indicating that the last
Acknowledgment)	message was not received correctly.

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