IBM SY27-0345-06 manual Simm

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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