Quick Reference Guide

188 Glossary
RAC
Remote access controller
RAM
Random-access memory. RAM is general-purpose readable and writable memory
on systems.
RAM disk
A memory-resident program which emulates a hard drive.
ROM
Read-only memory, from which data may be read, but to which data cannot be
written.
RPM
Red Hat Package Manager, a package-management system for the Red Hat
Enterprise Linux operating system. RPM manages the installation of software
packages. It is similar to an installation program.
SEL
System event log or hardware log
SMTP
Simple mail transfer protocol, used to transfer electronic mail between systems—
usually over an Ethernet.
SNMP
Simple network management protocol, designed to manage nodes on an IP
network. iDRACs are SNMP-managed devices (nodes).
SNMP trap
A notification (event) generated by the CMC that contains information about
state changes on the managed system or about potential hardware problems.
SSH
Secure Shell, a network protocol that allows data to be exchanged over a secure
channel between two computers.
SSL
Secure sockets layer, a protocol that provides secure communications over
networks for data transfers.