Glossary
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1553-KDU 137 365 Uen D 2006-06-16
as with DVMRP. PIM - Sparse Mode is
designed for networks where the probability of
a multicast client is low, such as on a Wide
Area Network. PIM - Dense Mode is designed
for networks where the probability of a
multicast client is high and frequent flooding of
multicast traffic can be justified.
QinQ Tunneling
QinQ is designed for service providers carrying
traffic for multiple customers across their
networks. It is used to maintain customer-
specific VLAN and Layer 2 protocol
configurations even when different customers
use the same internal VLAN IDs..
Quality of Service (QoS)
QoS refers to the capability of a network to
provide better service to selected traffic flows
using features such as data prioritization,
queuing, congestion avoidance and traffic
shaping. These features effectively provide
preferential treatment to specific flows either
by raising the priority of one flow or limiting the
priority of another flow.
Redundant Power Supply (RPS)
A backup power supply that automatically
takes over in case the primary power supply
should fail.
Remote Authentication Dial-in User
Service (RADIUS)
RADIUS is a logon authentication protocol that
uses software running on a central server to
control access to RADIUS-compliant devices
on the network.
Remote Monitoring (RMON)
RMON provides comprehensive network
monitoring capabilities. It eliminates the polling
required in standard SNMP, and can set
alarms on a variety of traffic conditions,
including specific error types.
Rapid Spanning Tree Protocol (RSTP)
RSTP reduces the convergence time for
network topology changes to about 10% of that
required by the older IEEE 802.1D STP
standard.
RJ45 Connector
A connector for twisted-pair wiring.
Routing Information Protocol (RIP)
The RIP protocol seeks to find the shortest
route to another device by minimizing the
distance-vector, or hop count, which serves as
a rough estimate of transmission cost. RIP-2 is
a compatible upgrade to RIP. It adds useful
capabilities for subnet routing, authentication,
and multicast transmissions.
Secure Shell (SSH)
A secure replacement for remote access
functions, including Telnet. SSH can
authenticate users with a cryptographic key,
and encrypt data connections between
management clients and the switch.
Simple Mail Transfer Protocol (SMTP)
A standard host-to-host mail transport protocol
that operates over TCP, port 25.
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