Computer Networking and Telecommunication

Question 1

Telecommunication

Answer 1

Tele: Long Distance
Communication: Sharing of Ideas, Views, Information with other individuals or machine

Question 2

Basic Elements of a Communication System

Answer 2

1. Sender
2. Receiver
3. Medium
4. Data-Instructions/Information
5. Protocol Rules

Question 3

Data Transmission Modes

Answer 3

Simplex: 1 way
Half Duplex: 2 way, 1 at a time
Duplex: 2 way, Simultaneous

Question 4

BITS

Answer 4

Binary Digits

Smallest Unit of measurement of a data

Question 5

Bandwidth

Answer 5

Range of frequency available for transmission
[amount of data that can travel through medium]
bits per second (bps, kbps)

Question 6

Computer Network Services

Answer 6

1. File: Transfer, Storage and Migration of files and data
2. Print: Sharing of printing device
3. Message: Sharing messages like emails, voice mails and instant messaging
4. Application: Sharing of application programs
5. Database: Distributing data that main server holds to users

Question 7

Advantages of Computer Networking

Answer 7

1. Hardware Sharing
2. Software Sharing
3. Sharing Remote Database( (reservations of tickets, bank balance, money transfer}
4. Communication
5. Cost Effective

Question 8

Disadvantages of Computer Networking

Answer 8

Virus Transfer
Less Secure (data)
Less Reliable (one computers disfunction affects everyone)

Question 9

Elements of Network

Answer 9

Server
Workstation
Network Interference Card
Communication Channel / Transmission Media

Question 10

Types of Server with differences

Answer 10

Non Dedicated
 can be used as workstation
 they are usually normal computers
 windows NT, Advanced 200
Dedicated
 can not be used as workstation
 they are usually powerful computers
 Novell NETWARE

Question 11

What are File, Print and Modem Server

Answer 11

File server is a server responsible for the storage and management of data files so that other computers on the same network can access the files.
Print server is a server that takes care of printing requirements of workstations.
Modem server allows network to use a MEDEM to transmit long distance messages through internet

Question 12

Workstation

Answer 12

Computers attached to a network and using the resources of the network

Question 13

Communication Channels/ Transmission Media (+ types)

Answer 13

The physical channels of pathways through which data travels
guided communication media
unguided communication

Question 14

Guided Communication Media (eg.)

Answer 14

where data are restricted to travel in physical wire 
bounded / guided
twisted (shielded + unshielded)
co-axial 
fiber optics

Question 15

Unguided Media Transmission

Answer 15

Data doesnt travel in a closed path
unbounded/unguided
radio wave
micro wave
satellite
infrared
bluetooth

Question 16

Elements of Network (10)

Answer 16

Network Interference Card
Connectors
Hub
Bridge
Switch
Router
Gateway
Repeater
Modem
Multiplexer

Question 17

Network Interference Card

Answer 17

Hardware that act as an interference between networking cable and the computer.
Each has unique identity number; node address

Question 18

Connectors

Answer 18

Interference between media (wire) and computer
RJ-45
BNC
ST

Question 19

Hub

Answer 19

Device that broadcasts data/network to every device connected to it

Question 20

Bridge

Answer 20

It is a device used to join two similar types of networks or LAN

Question 21

Switch

Answer 21

Used to connect more than one different networks.

Question 22

Router

Answer 22

It connects similar and dissimilar networks + determines the best path for sending data to reciever

Question 23

Gateway

Answer 23

Connect two types of dissimilar types of network.
It can modify data to connect networks and sometimes rewrite data into new
It also acts a firewall.

Question 24

Repeater

Answer 24

Increases length of network by amplifying weak signals

Question 25

Modem

Answer 25

Modulator and Demodulator

modulation: digital data to analog data
demodulation: analog data to digital data

Question 26

Multiplexer

Answer 26

Allows to send multiple signals across single transmission medium

Question 27

Transmission of data types

Answer 27

amplitude modulation
frequency modulation
phase modulation

Question 28

amplitude modulation

Answer 28

amplitude of carrier wave is varied in proportion to that of the message signal being transmitted
modulation frequency and phase remains same
1200 bps

Question 29

frequency modulation

Answer 29

modulation of radio or other wave by variation of its frequency
frequency varies
amplitude and phase constant
1200 to 2400 bpm

Question 30

phase modulation

Answer 30

variation of the phase of a radio or other wave as a means of carrying information such as an audio signal.
more noise resistant and efficient
9600 bps

Question 31

types of computer network

Answer 31

local area lan
metropolitan area man
wide area wan

Question 32

LAN

Answer 32

5 km

Question 33

MAN

Answer 33

100 km

Question 34

WAN

Answer 34

Unlimited

Question 35

Networking Architecture (3 types)

Answer 35

Client/Server architecture
Peer-to-peer architecture
Centralized network

Question 36

Client/Server architecture

Answer 36

All the data and application program are stored on a powerful central server
The server is high capacity, high storage and high speed computer
Only authorized client can access

Question 37

Peer-to-peer

Answer 37

Non-Dedicated Server
Any computer can act as the server/client
No computer is in-charge of the network

Question 38

Centralized Network

Answer 38

Central Server Computer act as communicator

Question 39

Network Topologies with types

Answer 39

Physical Layout or Geographic Orientation of computers in a network

a. bus topology
b. ring topology
c. star topology
d. mesh topology
e. tree topology