Perle Systems DS1 - Manual (Page 117)

IOLAN Device Server User’s Guide, Version 1.0 117
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.
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.
Local Authentication Uses the user ID and password stored within the Device Server User database.
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.
Reverse Connection Connections that originate from a host that go directly to a serial device through the Device
Server.
Silent Connection Silent connections are the same as direct connections except that they are permanently
established. The host login prompt is displayed on the screen. Logging out redisplays this
prompt. Silent connections, unlike direct connections, however, make permanent use of pseudo
tty resources and therefore consume host resources even when not in use.
SNMP (Simple
Network Management
Protocol)
A protocol for managing network devices.
Subnet/Prefix Bits Identifies the device’s IP address, which portion constitutes the network address and which
portion constitutes the host address.