Chapter 6 : Data communication

Question 1

What is the goal of data communication

Answer 1

To process information so that it is useful to specific users.

Question 2

What is data communication

Answer 2

Using Computers to transfer data from one place to another.

Question 3

Bandwidth

Answer 3

The amount of data that can be transferred from one point to another in a certain time period.

Question 4

Example of and E- Collaboration tool

Answer 4

GoToMeeting

Question 5

Components of a data communication system

Answer 5

1. Sender and receiver devices
   2.Modems or routers)
2. Communication medium (channel)

Question 6

Attenuation

Answer 6

Signal decreases as distance increases

Question 7

The two types of data transmission channels

Answer 7

1. Broadband
2. Narrowband

Question 8

Broadbrand

Answer 8

Multiple pieces of data are sent simultaneously to increase transmission rate

Question 9

Narrowband

Answer 9

Voice generated transmission medium channel capable of transmitting a maximum of 56 000bps, Therefore only a limited amount of information can be transferred in a specific period of time.

Question 10

Sender and Receiver devices

Answer 10

1. Input/output devices = thin clients
2. Smart terminal
3. Intelligent terminal
4. Netbook computer
5. Minicomputers, mainframes, and supercomputers

Question 11

Smart terminal

Answer 11

An input / output device that can preform certain processing tasks but not a full featured computer.

Question 12

Intelligent terminal, workstation, or personal computer

Answer 12

Input/output devices or stand alone systems. ( a step up a smart terminal.

Question 13

Netbook computer

Answer 13

A low cost, diskless computer used to connect to the internet or a LAN.

Question 14

What is DSL (Digital subscriber line)

Answer 14

• Makes use of normal telephone lines
• provides high speed transmission
  -Modems need DSL to access the internet

Question 15

Router

Answer 15

Connect network systems and control traffic flow between them.

Question 16

Medium or data channel can either be:

Answer 16

1. Wired = cabled
2. Wireless = no cables

Question 17

Purpose of the OSI Model

Answer 17

to standardize the transmission of data so that computers may communicate regardless of hardware and software.

Question 18

How many layers in the OSI Model

Answer 18

7 layers

Question 19

Going down the OSI Model means

Answer 19

Transmitting data

Question 20

Going up the OSI Model means

Answer 20

Receiving data

Question 21

Types of network divided by geographical area

Answer 21

1. LAN
2. MAN
3. WAN

Question 22

WAN

Answer 22

Spread over different countries

Question 23

MAN

Answer 23

Same country different cities e.g Wllington, Paarl, Stellenbosch

Question 24

Topology

Answer 24

refers to how the devices in the network are set up.

Question 25

Protocol

Answer 25

A standard for processing and formatting data

Question 26

Routing

Answer 26

route by which packets of data are delivered

Question 27

Horizontal scalability

Answer 27

More clients

Question 28

Vertical scalability

Answer 28

more servers

Question 29

What is the role of the client in a client server model?

Answer 29

local computer that communicates with and requests information from server

Question 30

What is the role of the server in a client server model

Answer 30

remote computer on network

Question 31

Mobile networks

Answer 31

Operate on radio frequencies, consist of 3 parts:
1. Base stations
2. Mobile telephone switching offices
3. Subscribers