Appendix C: Glossary

 

 

NVRAM

Non-Volatile Random Access Memory is a medium for storing system configuration

 

information, so the information is not lost when the system is reset.

octet

A TCP/IP term indicating eight bits.

PDU

Protocol Data Unit is data as it appears at the interface between a particular sublayer

 

and the sublayer immediately below.

QoS

Quality of Service is the configured traffic parameters that are assigned to a virtual

 

circuit, which specifies how quickly and how accurately data is transferred from the

 

sender to the receiver.

RFC

Request For Comment is a series of notes that contain surveys, measurements, ideas,

 

techniques, and observations, as well as proposed and accepted TCP/IP protocol

 

standards. RFCs are available on the Internet.

RIP

Routing Information Protocol allows routers to update the routing tables

 

automatically (for example, with information such as how many hops between

 

destinations). The version of RIP you select for the connection must match the

 

version supported by the service provider. Versions RIP1 and RIP-1 compatible use

 

for broadcast. Version RIP 2 uses multicast.

SEF

Severely Errored Frames is the incoming signal has at least four consecutive errored

 

framing patterns.

SES

Severely Errored Seconds is the seconds during which more than 2,500 bipolar errors

 

are detected on the line.

SNMP

Simple Network Management Protocol is a protocol that specifies how to send

 

information between a NMS and managed devices on a network. The managed

 

devices run a program called an agent. The agent interprets SNMP request and

 

responds to them. SNMP is used to set device configurations, read device

 

configurations, or read the device status.

Spanning Tree

A bridging protocol that detects and prevents loops from occurring in a system

 

containing multiple bridges.

subnet mask

A type of IP address that allows a site to use a single IP address for multiple physical

 

networks.

TCP

Transmission Control Protocol is a transport protocol used to map inbound traffic

 

(from a remote IP address) to an internal (LAN) IP address. Establishes connection

 

with remote user before data transmission.

TCP/IP

Transmission Control Protocol/Internet Protocol is a protocol used for

 

communications between computers over networks and the Internet.

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