Sun Microsystems Sun Fire X4150 - Manual (Page 143)

Glossary 127
Simple Network
Management Protocol
(SNMP) A simple protocol used to exchange data about network activity. With SNMP,
data travels between a managed device and a network management station
(NMS). A managed device can be any device that runs SNMP, such as hosts,
routers, web servers, or other servers on the network.
Small Computer
System Interface
(SCSI) An ANSI standard for control of peripheral devices by one or more host
computers. SCSI defines a standard I/O bus-level interface and a set of high-
level I/O commands.
Spanning Tree Protocol
(STP) A networking protocol based on an intelligent algorithm that enables bridges
to map a redundant topology and eliminates packet looping in local area
networks (LANs).
subnet A working scheme that divides a single logical network into smaller physical
networks to simplify routing. The subnet is the portion of an Internet Protocol
(IP) address that identifies a block of host IDs.
subnet mask A bit mask used to select bits from an Internet address for subnet addressing.
The mask is 32 bits long and selects the network portion of the Internet address
and one or more bits of the local portion. Also called an “address mask.”
superuser A special user who has privileges to perform all administrative functions on a
UNIX system. Also called “root.”
system event log
(SEL) A log that provides nonvolatile storage for system events that are logged
autonomously by the service processor, or directly with event messages sent
from the host.
T
Telnet The virtual terminal program that enables the user of one host to log in to a
remote host. A Telnet user of one host who is logged in to a remote host can
interact as a normal terminal user of the remote host.
threshold Minimum and maximum values within a range that sensors use when
monitoring temperature, voltage, current, and fan speed.
timeout A specified time after which the server should stop trying to finish a service
routine that appears to be hung.