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Worksheet — Data Communication and Computer Networks

Total questions: 149

Worksheet time: 1hrs 15mins

Name
Class
Date
1.

Data communication is the exchange of data between:

a)

Two processes

b)

Two networks

c)

Two devices

d)

Two servers

2.

Which of the following is not an element of data communication?

a)

Message

b)

Sender

c)

Receiver

d)

Compiler

3.

Data rate limits of a channel depend on:

a)

Bandwidth and noise

b)

Only bandwidth

c)

Only noise

d)

Cable length

4.

A signal that varies smoothly over time is:

a)

Digital

b)

Analog

c)

Binary

d)

Packet

5.

Communication where data travels only in one direction is:

a)

Simplex

b)

Half duplex

c)

Full duplex

d)

Parallel

6.

Transmission where both sender and receiver receive at different times is:

a)

Simplex

b)

Half duplex

c)

Full duplex

d)

Serial

7.

Transmission of multiple bits simultaneously uses:

a)

Serial

b)

Parallel

c)

Analog

d)

Digital

8.

Coaxial cable is an example of:

a)

Wireless

b)

Unguided media

c)

Guided media

d)

Satellite media

9.

Radio waves and microwaves are examples of:

a)

Guided media

b)

Analog media

c)

Unguided media

d)

Duplex media

10.

Network classification based on coverage area includes:

a)

LAN, MAN, WAN

b)

Hub, router, switch

c)

TCP/IP

d)

Bluetooth only

11.

A physical layout of a network is called:

a)

Protocol

b)

Topology

c)

Bandwidth

d)

Subnet

12.

A hub operates at which OSI layer?

a)

Physical

b)

Data link

c)

Network

d)

Transport

13.

A device that connects multiple LAN segments and filters traffic is:

a)

Repeater

b)

Bridge

c)

Modem

d)

Switch

14.

A router operates at the:

a)

Data link layer

b)

Physical layer

c)

Transport layer

d)

Network layer

15.

Which device reads MAC addresses to forward frames?

a)

Router

b)

Switch

c)

Hub

d)

Gateway

16.

OSI model has how many layers?

a)

5

b)

6

c)

7

d)

4

17.

The function of the transport layer is:

a)

Routing

b)

Node-to-node delivery

c)

End-to-end delivery

d)

Frame synchronization

18.

HTTP belongs to which OSI layer?

a)

Session

b)

Application

c)

Network

d)

Transport

19.

TCP/IP model has how many layers?

a)

7

b)

5

c)

4

d)

3

20.

The layer responsible for logical addressing in TCP/IP is:

a)

Network Access

b)

Transport

c)

Internet

d)

Application

21.

Circuit switching requires:

a)

Dedicated physical path

b)

Packet forwarding

c)

Shared bandwidth

d)

No connection setup

22.

Packet switching breaks data into:

a)

Circuits

b)

Channels

c)

Frames

d)

Packets

23.

ASK, FSK, and PSK are types of:

a)

Multiplexing

b)

Modulation

c)

Encoding

d)

Routing

24.

In FDM, bandwidth is divided into:

a)

Time slots

b)

Channels

c)

Frequencies

d)

Bits

25.

TDM assigns:

a)

Frequencies

b)

Time slots

c)

Chips

d)

Wavelengths

26.

WDM is used mainly in:

a)

Radio network

b)

Fiber-optic systems

c)

Coaxial cables

d)

Satellite networks

27.

SONET is mainly used in:

a)

Wireless network

b)

Optical communication

c)

Coaxial cable

d)

Token Ring

28.

CSMA/CD is used in:

a)

Wi-Fi

b)

Token Ring

c)

Ethernet

29.

Token Ring uses:

a)

CSMA/CD

b)

Flooding

c)

Token passing

d)

Slotted ALOHA

30.

Broadcasting means:

a)

One-to-one

b)

One-to-many

c)

Many-to-one

d)

Many-to-many

31.

Distance Vector routing uses:

a)

Dijkstra’s algorithm

b)

Bellman-Ford algorithm

c)

Flooding

d)

Link cost calculation only

32.

Link State routing uses:

a)

Flooding LSAs

b)

Neighbour table

c)

Count to infinity

d)

Hop count only

33.

Data Link Layer ensures:

a)

Global delivery

b)

Logical routing

c)

Node-to-node delivery

d)

Encryption

34.

Parity check is used for:

a)

Error correction

b)

Error detection

c)

Flow control

d)

Multiplexing

35.

CRC is best for detecting:

a)

Single-bit errors

b)

Burst errors

c)

Noise

d)

Framing

36.

Stop and Wait ARQ sends:

a)

Multiple frames

b)

One frame at a time

c)

Packets in sequence

d)

ACK once for all

37.

Go-Back-N retransmits:

a)

Only lost frame

b)

Only corrupted frame

c)

Corrupted frame & all after it

d)

None

38.

PPP is used in:

a)

LAN

b)

WAN point-to-point links

c)

Wi-Fi only

d)

IPv6 only

39.

Bit stuffing is used in:

a)

Character-oriented protocols

b)

Bit-oriented protocols

c)

HTTP

d)

SMTP

40.

Flow control prevents:

a)

Hacking

b)

Congestion

c)

Buffer overflow

d)

Routing errors

41.

TCP is a:

a)

Connectionless protocol

b)

Connection-oriented protocol

c)

Broadcast protocol

d)

Physical protocol

42.

UDP provides:

a)

Guaranteed delivery

b)

Connectionless service

c)

Built-in congestion control

d)

Reliable, ordered delivery

43.

Three-way handshake is used for:

a)

Connection release

b)

Error control

c)

Connection establishment

d)

Framing

44.

WWW stands for:

a)

World Wide Web

b)

Wide Web World

c)

Wireless Web World

d)

Web Wired World

45.

HTTP uses which port by default?

a)

20

b)

21

c)

25

d)

80

46.

FTP uses ports:

a)

80 and 443

b)

20 and 21

c)

53 and 67

d)

110 and 143

47.

SMTP is used for:

a)

Downloading mail

b)

Sending mail

c)

Encrypting mail

d)

Storing mail

48.

IPv4 address length is:

a)

8 bits

b)

16 bits

c)

32 bits

d)

128 bits

49.

IPv6 provides:

a)

32-bit addressing

b)

64-bit addressing

c)

128-bit addressing

d)

Unlimited but not fixed

50.

IMAP is used for:

a)

Sending emails

b)

Receiving emails while keeping them on server

c)

DNS lookups

d)

File transfer

51.

Unit I — Data Communication (Q1–10): The physical path through which data travels is called:

a)

Protocol

b)

Medium

c)

Topology

d)

Segment

52.

Unit I — Data Communication (Q1–10): A digital signal is represented using:

a)

Continuous values

b)

Infinite amplitude levels

c)

Discrete voltage levels

d)

Frequency waves

53.

Unit I — Data Communication (Q1–10): The maximum data rate of a noiseless channel is given by:

a)

Shannon capacity

b)

Nyquist theorem

c)

Fourier transform

d)

Hamming code

54.

Unit I — Data Communication (Q1–10): In full-duplex communication:

a)

Data flows in only one direction

b)

Both directions but not at same time

c)

Both directions simultaneously

d)

No data transmission happens

55.

Unit I — Data Communication (Q1–10): Serial communication transmits bits:

a)

In parallel

b)

One after another

c)

In random order

d)

In blocks

56.

Unit I — Data Communication (Q1–10): Twisted pair cables are commonly used in:

a)

Satellite networks

b)

Local telephone lines

c)

Microwave towers

57.

Infrared waves require:

a)

Line-of-sight

b)

Undersea cables

c)

Fiber optics

d)

Coaxial cable

58.

The Internet is an example of:

a)

PAN

b)

LAN

c)

MAN

d)

WAN

59.

The most basic network classification by ownership is:

a)

Private and Public

b)

Wired and Wireless

c)

LAN and WAN

d)

Internet and Intranet

60.

Which signal has infinite bandwidth theoretically?

a)

Digital square wave

b)

Analog sine wave

c)

Cosine wave

d)

FSK wave

61.

Mesh topology provides:

a)

Single path

b)

Fault tolerance

c)

Low cost

d)

No redundancy

62.

A repeater:

a)

Splits networks

b)

Amplifies and regenerates signals

c)

Filters frames

d)

Uses MAC address table

63.

Bridges operate at:

a)

Physical layer

b)

Data link layer

c)

Transport layer

d)

Application layer

64.

A gateway can operate at:

a)

Only Layer 1

b)

Only Layer 3

c)

Any layer

d)

Only Layer 7

65.

The OSI layer responsible for encryption is:

a)

Session

b)

Transport

c)

Presentation

d)

Network

66.

The session layer mainly handles:

a)

Addressing

b)

Synchronization

c)

Transmission

d)

Routing

67.

In TCP/IP, the link layer corresponds to OSI:

a)

Transport + Network

b)

Data link + Physical

c)

Session only

d)

Application only

68.

DHCP uses which transport protocol?

a)

TCP

b)

UDP

c)

ICMP

d)

HTTP

69.

ICMP is primarily used for:

a)

Error reporting

b)

Email

c)

File transfer

d)

Encryption

70.

ARP translates:

a)

IP → MAC

b)

MAC → IP

c)

URL → IP

71.

Circuit switching uses which phases?

a)

Transmit–Receive–End

b)

Setup–Transfer–Teardown

c)

Send–Acknowledge

d)

Fetch–Execute

72.

Packet switching allows:

a)

Fixed path

b)

No path reservation

c)

Dedicated channel

d)

Wasted bandwidth

73.

In ASK modulation, the varying parameter is:

a)

Frequency

b)

Phase

c)

Amplitude

d)

Bandwidth

74.

PCM stands for:

a)

Pulse Circuit Modulation

b)

Pulse Code Modulation

c)

Phase Channel Multiplex

d)

Packet Control Mode

75.

TDM multiplexes users by:

a)

Frequency

b)

Time

c)

Space

d)

Phase

76.

WDM sends multiple signals through:

a)

Same frequency

b)

Same wavelength

c)

Different wavelengths

d)

Different modems

77.

SONET primarily uses:

a)

Copper

b)

Coaxial

c)

Optical fiber

d)

Radio

78.

Token Bus belongs to:

a)

IEEE 802.4

b)

IEEE 802.3

c)

IEEE 802.5

d)

IEEE 802.11

79.

FDDI uses:

a)

Copper wire

b)

Fiber optics

c)

Coaxial cable

d)

Satellite

80.

Unicasting refers to:

a)

One-to-one

b)

One-to-all

c)

One-to-many

d)

Many-to-one

81.

In Distance Vector routing, routers exchange:

a)

Entire topology

b)

Link state packets

c)

Distance tables

d)

Datagrams only

82.

Count-to-infinity problem occurs in:

a)

Link State

b)

Hybrid routing

c)

Distance Vector

d)

All routing

83.

Link State routing builds:

a)

Full network map

b)

Only neighbor list

c)

Partial map

d)

Hop tables

84.

Stop-and-Wait suffers from:

a)

High efficiency

b)

Low latency

c)

Idle channel time

d)

Unlimited window size

85.

In Go-Back-N, window size is:

a)

Fixed at 1

b)

Equal to frames in transit

c)

Unlimited

d)

2n2^n

86.

Data Link Layer is responsible for:

a)

Bit transmission

b)

Process-to-process delivery

c)

Node-to-node delivery

d)

Routing

87.

In PPP, LCP stands for:

a)

Link Control Protocol

b)

Layer Control Protocol

c)

Line Configuration Packet

d)

Low Control Process

88.

A frame is delimited using:

a)

Bit stuffing

b)

Packet switching

c)

TCP flags

d)

Frequency division

89.

Error control is achieved using:

a)

ARQ

b)

Multiplexing

c)

Switching

d)

Encoding

90.

TCP provides reliability using:

a)

Parity bit

b)

Sliding window

c)

Hamming code

d)

ARQ only

91.

UDP is suitable for:

a)

File transfer

b)

Real-time applications

c)

Email

d)

Database requests

92.

TCP connection release uses:

a)

Three-way handshake

b)

Four-way handshake

c)

Two-way handshake

d)

Five-step closure

93.

A web browser uses:

a)

FTP

b)

SMTP

c)

HTTP

d)

TFTP

94.

HTTPS uses which port?

a)

20

b)

80

c)

110

d)

443

95.

POP3 is used for:

a)

Sending emails

b)

Uploading web pages

c)

Receiving emails

d)

File transfer

96.

DNS uses:

a)

TCP only

b)

UDP only

c)

Both TCP and UDP

d)

ICMP

97.

IPv4 provides how many total addresses?

a)

2162^{16}

b)

2322^{32}

c)

2642^{64}

d)

21282^{128}

98.

IPv6 includes built-in:

a)

ARP

b)

NAT

c)

IPSec

d)

SMTP

99.

The protocol used for remote login is:

a)

FTP

b)

Telnet

c)

SMTP

d)

DNS

100.

The rate at which data is transmitted is called ________.

a)

bandwidth

b)

latency

c)

bit rate

d)

jitter

101.

In data communication, the physical path between transmitter and receiver is called ________.

a)

node

b)

channel

c)

protocol

d)

frame

102.

A signal that varies smoothly over time is known as a ________ signal.

a)

digital

b)

analog

c)

binary

d)

discrete

103.

Transmission in both directions but not at the same time is called ________.

a)

simplex

b)

half-duplex

c)

full-duplex

d)

multiplex

104.

The fastest transmission mode among simplex, half-duplex, and full-duplex is ________.

a)

simplex

b)

half-duplex

c)

full-duplex

d)

broadcast

105.

Coaxial cable is an example of ________ transmission media.

a)

unguided

b)

guided

c)

wireless

d)

optical

106.

Radio waves, microwaves, and infrared are examples of ________ media.

a)

guided

b)

twisted-pair

c)

unguided

d)

coaxial

107.

The arrangement of computers in a network is called network ________.

a)

bandwidth

b)

topology

c)

protocol

d)

addressing

108.

A device that regenerates weak signals is known as a ________.

a)

hub

b)

switch

c)

repeater

d)

bridge

109.

A switch operates at the ________ layer of OSI model.

a)

physical

b)

data link

c)

network

d)

transport

110.

The OSI model has ________ layers.

a)

5

b)

6

c)

7

d)

8

111.

The transport layer is responsible for ________ to ________ delivery.

a)

node-to-node

b)

end-to-end

c)

link-to-link

d)

application-to-network

112.

TCP is a ________ oriented protocol.

a)

message

b)

connection

c)

datagram

d)

stateless

113.

UDP is a ________ oriented protocol.

a)

connection

b)

stream

c)

connectionless

d)

session

114.

The protocol used for email transfer between servers is ________.

a)

POP3

b)

IMAP

c)

SMTP

d)

FTP

115.

FTP uses port numbers ________ and ________.

a)

20 and 21

b)

21 and 22

c)

25 and 110

d)

53 and 80

116.

The unique address assigned to each device on a network is called ________.

a)

subnet mask

b)

IP address

c)

gateway

d)

SSID

117.

The default length of an IPv4 address is bits.

a)

16

b)

32

c)

64

d)

128

118.

IPv6 uses bit addressing.

a)

64

b)

96

c)

128

d)

256

119.

A router operates at the layer of OSI model.

a)

Data link

b)

Network

c)

Transport

d)

Physical

120.

Circuit switching establishes a dedicated before data transfer.

a)

path

b)

packet

c)

port

d)

frame

121.

Packet switching divides data into small units called.

a)

frames

b)

packets

c)

cells

d)

segments

122.

CSMA/CD is used in networks.

a)

Token Ring

b)

Ethernet

c)

Wi‑Fi

d)

Bluetooth

123.

IEEE 802.5 refers to network.

a)

Ethernet

b)

Token Ring

c)

Wi‑Fi

d)

Bluetooth

124.

Error detection using parity is an example of error detection.

a)

Burst

b)

Single‑bit

c)

Cyclic

d)

Checksum

125.

CRC stands for.

a)

Cyclic Redundancy Check

b)

Cross Routing Code

c)

Critical Redundancy Counter

d)

Channel Rate Control

126.

Stop‑and‑Wait ARQ sends frame at a time.

a)

one

b)

two

c)

four

d)

a window of N

127.

Go‑Back‑N ARQ allows up to frames in pipeline.

a)

1

b)

2

c)

N

d)

N−1

128.

The three‑way handshake is used in connection establishment.

a)

UDP

b)

IP

c)

TCP

d)

ICMP

129.

WWW stands for.

a)

World Wide Web

b)

Wide World Web

c)

Web Wide World

d)

World Wired Web

130.

HTTP uses the default port number.

a)

20

b)

21

c)

80

d)

443

131.

DNS stands for.

a)

Domain Name Service

b)

Domain Name System

c)

Distributed Name System

d)

Dynamic Network Service

132.

The smallest unit of data in a network is a.

a)

byte

b)

frame

c)

bit

d)

packet

133.

The physical layer deals with transmission of.

a)

segments

b)

packets

c)

signals

d)

applications

134.

Ethernet uses topology.

a)

ring

b)

star

c)

bus

d)

mesh

135.

A bridge works at the layer.

a)

physical

b)

data link

c)

network

d)

transport

136.

A hub operates at the layer.

a)

physical

b)

data link

c)

network

d)

transport

137.

The method of increasing bandwidth by combining multiple signals is called.

a)

modulation

b)

multiplexing

c)

encoding

d)

switching

138.

FDM stands for.

a)

Frequency Division Multiplexing

b)

Frame Delay Mechanism

c)

Frequency Distribution Method

d)

Fast Data Multiplexing

139.

TDM stands for.

a)

Time Division Multiplexing

b)

Transmission Delay Method

c)

Time Distribution Mechanism

d)

Timed Data Multiplexer

140.

WDM is mainly used in communication.

a)

satellite

b)

fiber‑optic

c)

radio

d)

microwave

141.

The protocol used in dial‑up Internet connection is.

a)

PPP

b)

SMTP

c)

FTP

d)

SNMP

142.

A network with a limited geographical area like a campus is called a.

a)

LAN

b)

MAN

c)

WAN

d)

PAN

143.

The logical arrangement of networks into a larger structure is called.

a)

routing

b)

internetworking

c)

encapsulation

d)

virtualization

144.

A repeater removes from signals.

a)

noise

b)

delay

c)

bandwidth

d)

jitter

145.

A system where sender and receiver clocks must be synchronized is called transmission.

a)

synchronous

b)

asynchronous

c)

isochronous

d)

burst

146.

The media access method used in Wi‑Fi is.

a)

CSMA/CD

b)

CSMA/CA

c)

TDMA

d)

FDMA

147.

SMTP works on port.

a)

25

b)

53

c)

110

d)

143

148.

ICMP is used for reporting.

a)

performance

b)

accounting

c)

error

d)

encryption

149.

The command “ping” uses the protocol.

a)

TCP

b)

UDP

c)

ICMP

d)

ARP

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