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Term Denition
Redundancy
Provides duplication of devices, services, or events. If a device, service, or event fails,
redundancy provides a backup that can replace the lost functionality.
Relay Agent
An Internet host or router that passes DHCP messages between DHCP clients and
DHCP servers.
RIP
Routing Information Protocol. Stipulates how routing table information is exchanged
between routers.
RJ-11 Connector
Grips up to four wires. RJ-11 connector plugs the handset into the telephone, and the
telephone into the wall.
RJ-45 Connector
Grips up to eight copper wires and resembles a standard RJ-11 telephone connector.
RJ-45 connectors are commonly used with Ethernet devices.
RMON
Remote Monitoring on Network. Provides network information to be collected from a
single workstation.
ROS
Real Time Operating System. An operating system designed for use in a real time
computer system.
Router
A device that connects to separate networks. Routers forward packets between two or
more networks. Routers operate at a Layer 3 level.
RSTP
Rapid Spanning Tree Protocol. Detects and uses network topologies that allow a faster
convergence of the spanning tree, without creating forwarding loops.
Running Conguration
File
Contains all Startup le commands, as well as all commands entered during the current
session. After the device is powered down or rebooted, all commands stored in the
Running Conguration le are lost.
RVSP
Resource V....Reservation Protocol. Enables Internet applications to obtain differing
service resources for trafc ows.
S
Segmentation
Divides LANs into separate LAN segments for bridging and routing. Segmentation
eliminates LAN bandwidth limitations.
Server
A central computer that provides services to other computers on a network. Services may
include le storage and access to applications.
SNMP
Simple Network Management Protocol. Manages LANs. SNMP-based software
communicates with network devices with embedded SNMP agents. SNMP agents
gather network activity and device status information and send the information back to a
workstation.
SoC
System on a Chip. An ASIC that contains an entire system. For example, a telecom SoC
application can contain a microprocessor, digital signal processor, RAM, and ROM.
Spanning Tree Protocol
Prevents loops in network traffic. The Spanning Tree Protocol (STP) provides tree
topography for any arrangement of bridges. STP provides one path between end stations
on a network, eliminating loops.
SSH
Secure Shell. Logs into a remote computer via a network, executes commands, and
transfers les from one computer to another.
Stand-alone Mode Permits a device to operate independently from other devices.
Startup Conguration Retains the exact device conguration when the device is powered down or rebooted.
Subnet
Sub-network. Subnets are portions of a network that share a common address
component. In TCP/IP networks, devices that share a prex are part of the same subnet.
For example, all devices with a prex of 157.100.100.100 are part of the same subnet.