ence model network layer. Contrastbridgewithand gateway.

S

SDLC . Synchronous Data Link Control.

T

TCP . Transmission Control Protocol.

TCP/IP . Transmission Control Protocol/Internet Pro- tocol.

Simple

Network

 

Management

Protocol (SNMP)

 

 

 

 

 

.

 

 

 

 

telephone

 

 

twisted

pair

 

.

 

One

or

more twisted

pairs

of

(1) An

IP

 

network

management

 

protocol

that

is

copper

 

wire

in

 

the

unshielded

voice-grade

cable

com-

 

 

used

 

 

to

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

monitor

routers

and

attached

networks.

(2) A

 

monly

 

 

used

 

to

connect

a

telephone

to

its

 

wall

 

jack.

TCP/IP-based protocol for exchanging

network

 

Also

 

referred unshieldedto as

 

twisted (UTP)pair.

 

 

 

 

 

 

 

manage-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ment

information

and

outlining

the

structure

for

commu-

 

In

data

communication,

a

device,

usually

 

nications

among

network

devices. SNMP

is

an

 

 

terminal .

 

 

 

 

equipped with a keyboard and display device, capab

application

layer

protocol. Information

on

 

 

 

 

devices

 

 

 

 

 

 

 

and receiving information.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

of

sending

 

 

 

 

 

 

 

 

 

managed is defined and stored in the application’s

Man-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

agement

Information

Base

 

(MIB).

 

 

 

 

 

 

 

throughput

 

 

.

 

 

(1) A

measure

of the amount of work

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SIMM .

Single in-line

 

memory

module.

 

 

 

 

 

 

performed

 

by

a

computer

system

over

a

 

given

 

period

 

 

 

 

 

 

 

time,

 

 

for

 

 

example,

number

of jobs per day. (I) (A

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

SNA .

Systems

Network

Architecture.

 

 

 

 

 

measure

of

 

the

amount

of

information

transmitted

 

over

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

a

network

 

in

a

given period of time. For example, a

SNMP .

Simple

Network

Management

 

Protocol.

 

 

 

network’s

data

transfer

 

rate

is

usually

measured

 

in

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

per

 

second.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Synchronous

Data

Link

Control

(SDLC)

 

 

 

 

.

 

A

discipline

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

conforming

 

to

subsets

of

 

the

Advanced

Data

token

 

. (1) In a local area network, the symbol of

 

 

Communi-

 

 

 

 

passed successively from one data station

cation

Control

Procedures

 

(ADCCP)

of

 

the

 

 

 

 

authority

 

 

 

 

Americ

n

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

National

Standards

Institute

 

(ANSI)

and

 

 

 

 

another to indicate the station temporarily in control

 

High-level

Data

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Link

Control

 

(HDLC)

of

the

 

International

 

 

 

 

the

 

transmission

medium. Each

data

station

has

an

 

 

 

 

Organization

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for

Standardization,

for

 

managing

synchronous,

 

opportunity

 

to

acquire

and

use

the

 

token

to

control

 

 

code-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

transparent,

serial-by-bit

 

information

transfer

medium. A token is a particular message or bit patte

 

 

over

 

 

a

link

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connection. Transmission

exchanges

may

be

 

 

 

that

 

 

signifies

permission

to

transmit. (T)

 

(2) In

 

LANs,

duplex

or

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

half-duplex

over

switched

 

or

nonswitched

 

 

sequence

of

bits

passed

from

one

device

to

 

another

 

links. The

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

configuration of the link connection

 

may

be

 

along

 

the transmission medium. When the token has

 

 

 

 

 

point-to-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

point,

multipoint,

or

loop.

(I)

 

 

 

 

 

 

 

 

data

 

 

appended

to

it,

it

becomes

 

a

frame.

 

 

 

 

system unit .

(1) A

part

of

 

a

computer

 

that

token

 

ring

 

.

 

 

(1) According

 

to

IEEE

802.5,

network

 

 

 

 

 

 

co tains

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the

processing

unit

and

 

devices,

such

as

 

technology

 

that

controls

 

media access

by

 

passing

 

a

 

disk

and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

diskette

drives.

(2) In

 

an

 

IBM

personal

 

 

 

token

 

(special packet or frame) between media-attache

 

 

 

computer,

 

 

the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

stations.

(2) A

FDDI or

 

IEEE

802.5

network

 

with

a

ring

unit that contains the processor circuitry, read-only

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

memory

(ROM),

random

access

memory

 

(RAM),

 

and

topology

that passes tokens from one attaching ring

the

I/O

 

channel. It

can

 

have

one

or

 

two

 

station

 

(node)

to

another.

(3)localSee

areaalso

 

 

 

 

 

 

 

 

 

 

diskette

drives.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

network

 

(LAN).

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Systems

Network

Architecture

(SNA)

 

 

 

.

 

The

 

 

 

 

 

trace .

 

 

(1) A record of the execution of a computer

description

of

the

 

logical

structure,

 

 

 

 

 

 

 

formats,

protocols,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

and

operational

sequences

for

transmitting

 

 

program. It

 

exhibits

the

sequences

in

which

the

 

information

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

instructions

 

were

executed. (A)

(2) For

data

links,

a

units through, and controlling the configuration and

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

operation

 

of,

networks.

 

 

 

 

 

 

 

 

 

 

 

 

record

of

 

the

frames

 

and

bytes

transmitted

or

 

rec

Note:

The

 

layered

structure

of

SNA

allows

the

ultimate

 

 

 

Protocol

(TCP)

 

 

 

.

(1) A

commu-

 

 

 

 

 

origins

and

destinations

of

information,

 

that

 

Transmission

Control

 

 

 

 

 

 

 

 

 

 

is,

 

the end

 

 

used

in

Internet

and

in

any

network

users,

to

 

be

independent

of

and

 

 

 

 

 

 

nications

protocol

 

 

unaffected

by

 

 

the

 

spe-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

cific

SNA

 

network

services

and

facilities

 

 

that

 

follows the U.S. Department of Defense standard

 

used

for

 

infor-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

host

mation

exchange.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

for

 

inter-network protocol. TCP provides a reliable

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

to-host protocol between hosts in packet-switched com-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

munications

 

networks

and

in

interconnected

systems

 

of

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

such

 

 

networks. It

assumes

that

the

Internet

protocol

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

the

 

underlying

protocol.

 

(2) A transport protocol in the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Internet suite of protocols that provides reliable,

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

connection-oriented,

full-duplex

data

 

stream

 

service.

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