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Data and Digital Communication Fi

Total questions: 120

Worksheet time: 3615secs

Name
Class
Date
1.

The _ was invented in 1844 by Samuel F. B. Morse.

a)

telegraph

b)

television

c)

telescope

2.

This communication system is based on broadcasting electromagnetic waves is a ____________.

a)

television

b)

telegraph

c)

radio

3.

The _ is a series of interconnected networks which allows communication among computers.

a)

WWW

b)

Internet

c)

smartphone

4.

A message that is communicated by radio or television.

a)

pronounce

b)

broadcast

c)

code

5.

Which transmission media has the highest transmission speed in a network?

a)

coaxial cable

b)

twisted pair cable

c)

optical fiber

d)

electrical cable

6.

Bits can be send over guided and unguided media as analog signal by

a)

digital modulation

b)

amplitude modulation

c)

frequency modulation

d)

phase modulation

7.

Which data communication method is used to transmit the data over a serial communication link?

a)

Simplex

b)

Half-duplex

c)

Full duplex

d)

All of above

8.

Which of the following performs modulation and demodulation?

a)

fiber optics

b)

switch

c)

modulator

d)

modem

9.

Which of the following is not a guided medium?

a)

twisted-pair cable

b)

coaxial cable

c)

fiber-optic cable

d)

atmosphere

10.

Transmission media lie below the _______ layer.

a)

physical

b)

network

c)

transport

d)

application

11.

Twisting in a twisted-pair help reduce the __________.

a)

length

b)

cost

c)

noise

d)

None of the choices are correct

12.

In electromagnetic spectrum for wireless communication, reserved range for Radio waves and microwaves is known as

a)

ground propagation

b)

sky propagation

c)

line-of-sight propagation

d)

None

13.

Radio waves, micro- waves and infrared waves are types of

a)

wireless transmission

b)

guided transmission

c)

both a and b

d)

None

14.

Transmission media are usually categorized as __________.

a)

fixed or unfixed

b)

guided or unguided

c)

determinate or indeterminate

d)

metallic or non-metallic

15.

_______ cable consists of an inner copper core and a second sheath.

a)

twisted-pair

b)

coaxial

c)

fiber-optic

d)

shielded twisted-pair

16.

STP means?

a)

Shielded Twist Pair

b)

Shielded Twisted Pair

c)

Shine Twisted Pair

17.

Definition of a network is

a)

Collection of data and information

b)

Collection of computer and software c

c)

Collection of computer connected together via communication devices and transmission media

d)

Collection of computer and devices connected together via communications devices and transmission media

18.

A school wants to set up a network for their students, and staff. What will be the requirements of setting up a network in School?

a)

Hardware

b)

Software

c)

Cables

d)

All of the above

19.

Below are the advantages of a network except

a)

Information security

b)

Transferring hardware

c)

Sharing hardware

d)

Data backup

20.

Twisting in a twisted-pair help reduce the __________.

a)

length

b)

cost

c)

noise

d)

None of the choices are correct

21.

Match the picture to the transmission media

a)

coaxial cable

b)

fibre optic

c)

twisted pair

22.

Choose Wireless transmission media (You can choose more than one answer)

a)

Wi-Fi

b)

Modem

c)

Microwave

d)

Hotspot

23.

What is the function of Network Interface Cards?

a)

connects the clients, servers and peripherals to the network through a port

b)

allows you to segment a large network into smaller, efficient networks

c)

connects networks with different protocols like TCP/IP

d)

boost the signal between two cable segments or wireless access points

24.

________________________ is a single copper wire surrounded by at least three layers, namely

-1) an insulating material

-2) a woven or braided metal

-3) a plastic outer coating-1) an insulating material

a)

Coaxial cable

b)

Twisted-pair cable

c)

Fiber-optic cable

d)

Bandwidth

25.

____________________ allow people to connect wirelessly to the Internet from home, work, school and in many public locations.

a)

Wireless Internet Access points

b)

Wired Internet Access points

c)

Router

d)

Cybercafe

26.

A __________________________ is a network that covers a large geographical area.

a)

Local Area Network (LAN)

b)

Wireless LAN (WLAN)

c)

Metropolitan area netowrk (MAN)

d)

Wide area network (WAN)

27.

What is layer 7 of the OSI model?

a)

Application

b)

Presentation

c)

Session

d)

Transport

28.

What is layer 4 of the OSI model?

a)

Session

b)

Transport

c)

Network

d)

Data Link

29.

What are sets of clearly defined rules, regulations, standards, and procedures that enable hardware and software developers to make devices and applications that function properly at a particular layer?

a)

Protocol

b)

TCP/IP

c)

Networks

d)

Interconnection

30.

What does MAC stand for?

a)

media access control

b)

multi access control

c)

media account control

d)

multi address control

31.
Packets are found at which layer?
a)
Network
b)
Transport
c)
Session
d)
Data Link
e)
Physical
32.
Bits are packaged into frames at which layer of the OSI model?
a)
Data Link
b)
Physical
c)
Application
d)
Transport
e)
Presentation
33.

Tick all the statements that match the presentation layer

a)

Responsible for data translation and code formating

b)

Manages and dismantles sessions between users

c)

Segments and Reassembles data into a single stream

d)

Presents Data to the application Layer

e)

Data, compression, decompression, encryption and decryption and assoicated with this layer

34.

Error detection and recovery takes place at which layer?( Choose all that apply)

a)

transport

b)

presentation

c)

data link

d)

application

e)

network

35.

Which of the following are considered to be the upper layer protocols?

a)

presentation and session

b)

application and presentation

c)

application, presentation, and session

d)

application, presentation, session, and transport

e)

application

36.

IP is implemented at which OSI model layer?

a)

transport

b)

session

c)

data link

d)

network

e)

logical link control

37.

What does OSI stand for?

a)

International Standards Organization

b)

Open Systems Interconnect

c)

Operating Standard Information

d)

Operating System Interconnection

e)

Open Systems Interface

38.

Repeaters and hubs operate at which layer?

a)

network

b)

data link

c)

transport

d)

physical

e)

session

39.

Which OSI layer assumes responsibility for managing, establishing, and ending network connections between applications?

a)

Network layer

b)

Data link layer

c)

Application layer

d)

Session layer

40.

Which of the following performs modulation and demodulation?

a)

fiber optics

b)

switch

c)

modulator

d)

modem

41.

Radio communication frequencies range from ______

a)

3 kHz to 300 kHz

b)

300 kHz to 3 GHz

c)

3 KHz to 300 GHz

d)

3 KHz to 3000 GHz

42.

If a satellite is in geosynchronous orbit, it completes one orbit in ______________

a)

one hour

b)

24 hours

c)

one month

d)

one year

43.

What is multiplexing

a)

Two way transmission not at the same time

b)

a technology used to modify analog signals to make them suitable for carrying data over a communication path

c)

A form of transmission that allows multiple signals to travel simultaneously over one medium

d)

composed of pulses of precise, positive voltages and zero voltages

44.

"Vary depending on the grade of copper used, the category

rating, and any enhancements"


this statement is referring to:

a)

STP cable

b)

fiber optic cable

c)

UTP cable

d)

Coaxial cable

45.

There are 3 common cable problem,they are:

a)

No connection

b)

Short connection

c)

Slow connection

d)

Intermittent

46.

Signal propagation is always affected by three phenomenons. They are:

a)

Scattering

b)

Differentiation

c)

Diffraction

d)

Reflection

47.

The study of the transmission of information or messages through different systems is called

a)

science

b)

mathematics

c)

communications

d)

engineering

48.

A signal that uses binary code (1s and 0s). It provides a constant and consistent signal.

a)

analog

b)

digital

c)

binary

d)

encrypted

49.

A signal that is a continuous wave, varying in strength or frequency (includes the human voice and FM radio).

a)

decrypted

b)

encrypted

c)

digital

d)

analog

50.

The original sender of the message, which could be a person or a machine

a)

destination

b)

source

c)

transmitter

d)

receiver

51.

An electronic device that produces radio waves - or the device that sends the message.

a)

receiver

b)

transmitter

c)

encoder

d)

digital signal

52.

Device that captures radio signals to convert signals into a usable or readable form

a)

decoder

b)

receiver

c)

transmitter

d)

communication

53.

A device, circuit, software program, or person that converts information from the source into another format to prepare for transmission.

a)

transmitter

b)

receiver

c)

decoder

d)

encoder

54.

A device that converts signal into sound, pictures, or readable text for the receiver.

a)

encoder

b)

decoder

c)

transmitter

d)

source

55.
Characteristics of synchronous exchange
a)

Past time exchange

b)

Sender and receiver

c)

Real time exchange and requester waits for an answer

d)

None

56.
Examples for synchronous exchange
a)

Movie maker

b)

Phone call and webservices

c)

Email and post card

d)

Photos

57.

Data transmission where data is transferred one bit at a time.

a)

Asynchronous

b)

Synchronous

c)

Simplex

d)

Half Simplex

58.

What is not an example of synchronous transmission?

a)

In-person meeting

b)

Phone call

c)

the World Wide Web

d)

Video conference

59.

__________ transmission enables moving data bit by bit

a)

Full duplex

b)

Asynchronous

c)

Parallel

d)

Serial

60.

Used in Integrated Circuits and Buses

a)

Parallel Data Transmission

b)

Serial Data Transmission

61.
Which protocol would you use to transfer files?
a)

FTP

b)

SMTP

c)

POP3

d)

HTTP

62.
Which protocol would you use to create a copy of the email from your email server?
a)

FTP

b)

SMTP

c)

POP3

d)

HTTP

63.
Which protocol does this symbolise?
a)

HTTPS

b)

SMTP

c)

FTP

d)

IMAP

64.

What equipment will usually be found at the centre of a star network?

a)

Server

b)

Switch

c)

Printer

d)

Scanner

65.

Which network topology is the most secure?

a)

Star

b)

Bus

66.

What does the 'W' stand for in 'WAN'

a)

Wireless

b)

World

c)

Web

d)

Wide

67.

What is a network protocol?

a)

A shape of a network, such as star

b)

A set of rules for sharing data

c)

The requirements for passwords, such as length

d)

The size of a network, such as WAN

68.

Which of the following is NOT a network protocol?

a)

UDP

b)

TCP

c)

LAN

d)

SMTP

69.

Which network protocol will be used for banks' websites?

a)

HTTPS

b)

HTTP

c)

UDP

d)

SMTP

70.

What does UDP stand for?

a)

User Data Protocol

b)

User Datagram Protocol

c)

User Date Protocol

d)

User Dynamic Protocol

71.

Which protocol routes individual packets?

a)

IP

b)

TCP

c)

FTP

d)

SMTP

72.

What does TCP stand for?

a)

Transcript Control Protocol

b)

Transition Control Protocol

c)

Transmit Control Protocol

d)

Transmission Control Protocol

73.

Select TWO statements which TCP/IP process follows

a)

Request from client sent to server

b)

Packets are sent in order

c)

Packets are sent as one file

d)

Confirmation is sent back to confirm that packets have been received

74.

One of the advantages of UDP?

a)

Secure

b)

Larger

c)

Smaller

d)

Faster

75.

Before data transmission begins, devices send messages to one-another, completing a task called?

a)

Data Transmission

b)

Handshaking Process

c)

Network Protocol

d)

Packet Switching

76.
description of HTTP ( Hyper Text Transfer Protocol)
a)
an application protocol for distributed, collaborative, and hypermedia information systems
b)
cheap,fast,can be sent anytime
c)
slow data restoration, privacy of backed up data, offsite provider might go out of business
d)
managing e-mail and snail-mail , ,Answering and screening phone calls., Personal, private, or business research and purchasing.
77.

________________ error detection method uses one\'s complement arithmetic.

a)

Simple parity check

b)

Two-dimensional parity check

c)

CRC

d)

Checksum

78.

In cyclic redundancy checking, what is the CRC?

a)

Divisor

b)

Quotient

c)

Dividend

d)

Remainder

79.

In ________ error correction, the receiver asks the sender to send the data again.

a)

forward

b)

backward

c)

retransmission

d)

redirection

80.

The checksum of 0000 and 0000 is __________.

a)

0001

b)

0011

c)

0111

d)

1111

81.

The _____of errors is relatively more difficult than the error ______.

a)

correction; detection

b)

detection; correction

c)

creation; correction

d)

creation; detection

82.

Which can detect two bit errors?

a)

Parity check

b)

Cyclic redundancy check

c)

Parity and cyclic redundancy check

d)

None of the mentioned

83.

What two types of ARQ will continue to send frames while it waits for acknowledgements?

a)

Go-Bank-N ARQ

b)

Stop-and-Wait ARQ

c)

Selective Repeat ARQ

84.

What size error can Hamming code correct?

a)

Single-bit errors

b)

2-bit errors

c)

4-bit errors

d)

8-bit errors

85.

What form of error correction does TCP use?

a)

Parity Bits

b)

FEC

c)

CRC

d)

ARQ

86.

What usually causes bit errors in data transmission?

a)

Transmission line disconnection

b)

Typing mistakes

c)

Noise

d)

Poor S/N ratio at the receiver

87.

The process of monitoring data transmission and determining when errors have occurred.

a)

Error Detection

b)

Error Correction

c)

Error Control

d)

Error Monitoring

88.

Duplicating each data unit for the purpose of detecting errors is a form of error detection called:

a)

Overheading

b)

Replicating

c)

Redundancy

d)

Hamming

89.

What type of error correction sends redundant error correction code along with a frame?

a)

ARQ

b)

CRC

c)

FEC

d)

Parity Bits

90.

Data is sending from sender but received data not same as sended data we call it as.......

a)

Data wrong

b)

Data missing

c)

Error

d)

Data not correct

91.

Hamming code is a combination of

a)

Data + check sum

b)

Data+crc

c)

Data +parity bits

92.

Addition of bit in a original DATA is called _________ bit

a)

service

b)

Parity

c)

check

93.
What machine was used during WWII to encrypt and decrypt German messages?
a)
Enigma
b)
Atbash
c)
Secret
d)
Puzzler
94.

What was the name of the man who led the team that cracked the German's "Enigma Code" in WW2?

a)

Tim Berners-Lee

b)

Alan Turing

c)

Stephen Hawking

d)

Bill Gates

95.

In Cryptography, original message, before being transformed, is called

a)

Simple Text

b)

Plain Text

c)

Cipher Text

d)

Filled Text

96.

An encryption algorithm transforms plain text into:

a)

Cipher text

b)

Simple Text

c)

Empty Text

d)

Plain Text

97.

_______ is the science and art of transforming messages to make them secure and immune to attacks.

a)

Cryptography

b)

Cryptoanalysis

c)

neither Cryptography nor Cryptoanalysis

d)

either Cryptography or Cryptoanalysis

98.

A(n) ______ algorithm transforms cipher text to plain text.

a)

Encryption

b)

Decryption

99.

The art and science of breaking the cipher text is known as

a)

Cryptanalysis

b)

Cryptography

c)

Staganography

d)

Watermarking

100.
Which of these is the most secure way of data transfer?
a)

HTTP

b)

HTTPS

101.

What does this padlock sign mean in the address bar of your browser?

a)

The site is secure and data is transmitted using SSL

b)

There is a padlock available for purchase

c)

The website does not include "safety locks"

d)

The page is locked down for some odd reason

102.
What type of key is not shared and computers cannot decrypt a message without it?
a)

Free key

b)

Private key

c)

Public key

d)

Personal key

103.
What type of key can be freely shared with anyone so that they can encrypt a message?
a)

Personal key

b)

Private key

c)

Free key

d)

Public key

104.

What does SSL stand for?

a)

Secure Socket Layer

b)

Secret Secure Layer

105.
When you receive an email from what seems to be a trustworthy source, asking you to log in or download something, but the link goes to a fake site, this is known as?
a)
Malware
b)
Adware
c)
Trojan
d)
Phishing scam
106.
If a friend of yours had this stuck on their laptop, what would you advise them to do?
a)
Great idea, you should always write down your password somewhere so you don't forget it!
b)
You need to make sure all your passwords are the same as this one!
c)
You should use a stronger password which includes letters and symbols and more characters, yours is too easy to guess!
d)
Use a shorter password so you can remember it better!
107.
A part of a computer system used to prevent, detect and block unauthorised access is known as?
a)
Spyware
b)
Malware
c)
Trojan Horse
d)
Firewall
108.
What is the computer software used to prevent, detect and remove malicious software.
a)
Firewall
b)
Antivirus software
c)
Phishing scam
d)
SMTP
109.

What is Malware?

a)

Programs that can attack only computers.

b)

Programs that can attack computers, tablets, phones and other digital devices.

c)

Programs that can protect computers, tablets, phones and other digital devices.

d)

Programs that can protect only computers.

110.
What is spyware?
a)
Causes adverts to appear on screen.
b)
Software that deletes your files
c)
Slows your pc down.
d)
Collects information from you and transfers it across the internet.
111.

I spread through normal programs, once on a device I can spread quickly.

What Am I?

a)

Virus

b)

Bots

c)

Worms

d)

Spyware

112.

How can we prevent Malware attacks? (Select 2)

a)

Install Anti-Virus

b)

Make sure we have strong passwords

c)

Run regular scans

d)

Don't access personal info with public Wi-FI

113.

Which of the following is a type of malicious software with the main goal of replicating and spreading itself?

a)

Worm

b)

Virus

c)

Spyware

d)

Trojan Horse

114.

Which of these would be the safest password?

a)

Password

b)

9As5w0rD!

c)

Drowssap

d)

PPAASSWWOORRDD

115.

Gaining unauthorised access to someone else’s computer files is known as:

a)

copyright infringement

b)

hacking

c)

virus attack

d)

data theft

116.

What do you mean by malware?

a)

Unauthorised assessed programmes.

b)

Software used to steal data.

c)

Malware is a malicious sofrware program designed to harm a computer system.

d)

Software used for hacking.

117.

What do you mean by virus?

a)

virus is a malicious software program that replicates

itself.

b)

Virus is a hacking software.

c)

Virus is a small internet file used to help in remort login.

d)

Virus is harmfull mail.

118.

What do you mean by spam?

a)

Spam means harmful software.

b)

Spam means virus.

c)

Spam refers to unsolicited bulk emails.

d)

Spam means a mail which giving a intersting link.

119.

What were some of the key developments in the history of data communications that led to the widespread use of the internet today?

a)

10 Mbps

b)

100 Mbps

c)

1 Gbps

d)

10 Gbps

120.

Category 6 UTP cable supports data transmission rates up to

a)

10 Mbps

b)

100 Mbps

c)

1 Gbps

d)

10 Gbps

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