75 MCQ [KNOWLEDGE LEVEL] - Computer Network and Communication - SEE COMPUTER SCIENCE - CDC NEW CURRICULUM 2083 [ process of ________.
A. Storing data in a computer B. Sending and receiving
information over long distances ✅ C. Repairing network devices D.
Designing websites
Explanation: Telecommunication is the transmission of information over
long distances using electronic communication systems.
2. Which broadband technology uses existing telephone
lines to provide Internet access?
A. Cable Broadband B. DSL ✅ C. Fiber-optic Broadband D.
Satellite Broadband
Explanation: DSL (Digital Subscriber Line) provides Internet service
through telephone lines.
3. Frequency is measured in ________.
A. Bytes B. Hertz (Hz) ✅ C. Volts D. Watts
Explanation: Frequency is measured in Hertz (Hz), which indicates the
number of signal cycles per second.
4. Which mobile network generation first introduced video
calling and multimedia services?
A. 2G B. 3G ✅ C. 4G D. 5G
Explanation: 3G introduced video calling, mobile Internet, and
multimedia services.
5. Which mobile network generation provides the highest
speed and the lowest latency?
A. 2G B. 3G C. 4G D. 5G ✅
Explanation: 5G offers the fastest data speed, very low latency, and
supports advanced technologies like IoT and smart cities.
6. Broadband is best defined as a ________.
A. Network cable B. High-speed Internet connection ✅ C.
Computer software D. Mobile application
Explanation: Broadband is a high-speed Internet connection that allows
fast data transmission.
7. Which of the following is NOT a telecommunication
device?
A. Mobile phone B. Radio C. Television D. Scanner ✅
Reason: A scanner is an input device used to capture images or
documents, not a telecommunication device.
8. Which of the following is the smallest unit used to
measure frequency?
A. GHz B. MHz C. kHz D. Hz ✅
Reason: Hertz (Hz) is the basic unit of frequency, representing one
cycle per second.
9. What is the primary purpose of dividing data into
packets during transmission?
A. To increase monitor resolution B. To make data
transmission more efficient and reliable ✅ C. To reduce computer memory D.
To improve battery life
Reason: Data packets allow large files to be transmitted efficiently and
retransmitted if any packet is lost.
10. Which mobile network generation first introduced
high-definition (HD) video streaming?
A. 2G B. 3G C. 4G ✅ D. 5G
Reason: 4G provides the speed required for smooth HD video streaming and
faster mobile Internet.
11. Which mobile network generation is specially designed
to support the Internet of Things (IoT)?
A. 2G B. 3G C. 4G D. 5G ✅
Reason: 5G supports millions of connected smart devices with low latency
and high reliability.
12. Which of the following is an example of broadband
Internet?
A. Fiber-optic connection ✅ B. AM Radio C. Newspaper D.
Walkie-talkie
Reason: Fiber-optic broadband provides high-speed Internet using light
signals.
9. Communication media is also known as ________.
A. Network topology B. Transmission media ✅ C.
Network protocol D. Operating system
Reason: Communication media is called transmission media because it
carries data from one device to another.
10. Which type of communication media uses physical
cables to transmit data?
A. Guided media ✅ B. Unguided media C. Satellite
media D. Broadcast media
Reason: Guided media transmits data through physical cables such as
twisted pair and optical fiber.
11. Which of the following is an example of guided
communication media?
A. Wi-Fi B. Bluetooth C. CAT6 cable ✅ D.
Satellite
Reason: CAT6 cable is a wired transmission medium used in computer
networks.
12. Optical fiber transmits data using ________.
A. Electrical signals B. Radio waves C. Light signals ✅ D.
Sound waves
Reason: Optical fiber uses pulses of light to transmit data at very high
speed.
13. Which communication media uses electrical signals for
data transmission?
A. Optical fiber B. CAT6 cable ✅ C.
Infrared D. Satellite
Reason: CAT6 cable carries electrical signals through copper wires.
14. Which connector is commonly used with CAT6 Ethernet
cables?
A. SC B. LC C. RJ-45 ✅ D. ST
Reason: RJ-45 is the standard connector used with Ethernet cables such
as CAT5e and CAT6.
15. Which of the following is an example of unguided
communication media?
A. Optical fiber B. Coaxial cable C. Wi-Fi ✅ D.
CAT6 cable
Reason: Wi-Fi transmits data wirelessly through radio waves without
using physical cables.
16. Which wireless technology is mainly used to identify
and track objects using radio waves?
A. Bluetooth B. Wi-Fi C. RFID ✅ D. Infrared
Reason: RFID identifies and tracks tagged objects using radio frequency
signals.
17. What is the primary function of a connector in a
computer network?
A. To store data B. To connect communication media to
network devices ✅ C. To process data D. To
display information
Reason: Connectors provide the physical connection between communication
media and network devices.
18. Which connector is commonly used with Ethernet
cables?
A. USB B. HDMI C. RJ-45 ✅ D. VGA
Reason: RJ-45 is the standard connector used for Ethernet networking.
19. How many metal pins are present in an RJ-45
connector?
A. 4 B. 6 C. 8 ✅ D. 10
Reason: An RJ-45 connector contains eight metal pins for Ethernet
communication.
20. Which device converts electrical signals into light
signals and vice versa?
A. Hub B. Router C. Media Converter ✅ D.
Switch
Reason: A media converter connects copper and fiber optic networks by
converting electrical and light signals.
21. A media converter is mainly used to connect ________.
A. Two wireless networks B. Copper and fiber optic networks ✅ C.
Two Bluetooth devices D. Two printers
Reason: A media converter enables communication between copper cable
networks and fiber optic cable networks.
22. Which networking device regenerates weak signals to
extend the transmission distance?
A. Router B. Repeater ✅ C. Bridge D. Gateway
Reason: A repeater regenerates weak signals so they can travel longer
distances without significant loss.
23. Which networking device forwards data packets based
on IP addresses?
A. Hub B. Bridge C. Router ✅ D. Switch
Reason: A router forwards data between different networks using IP
addresses.
24. Which networking device broadcasts incoming data to
all connected devices?
A. Switch B. Bridge C. Hub ✅ D. Router
Reason: A hub sends incoming data to every connected device without
checking the destination.
25. Which networking device connects two similar computer
networks?
A. Gateway B. Bridge ✅ C. Repeater D. Modem
Reason: A bridge connects and manages communication between two similar
LAN segments.
26. Which networking device performs modulation and
demodulation of signals for Internet communication?
A. Switch B. Gateway C. Modem ✅ D. Bridge
Reason: A modem modulates and demodulates signals for data
communication.
27. Which network topology uses a single backbone cable
to connect all devices?
A. Star B. Ring C. Bus ✅ D. Hybrid
Reason: In a bus topology, all devices are connected to one main
communication cable called the backbone.
28. Which network topology uses a hub or switch as the
central connecting device?
A. Bus B. Star ✅ C. Ring D. Hybrid
Reason: In a star topology, every device is connected to a central hub
or switch.
29. Which network topology forms a closed loop?
A. Bus B. Star C. Ring ✅ D. Hybrid
Reason: In a ring topology, each device is connected to two neighboring
devices, forming a closed circle.
30. Which network topology is formed by combining two or
more different topologies?
A. Bus B. Star C. Ring D. Hybrid ✅
Reason: A hybrid topology combines two or more network topologies within
the same network.
31. Which device is commonly used as the central
connecting device in a star topology?
A. Repeater B. Hub/Switch ✅ C. Bridge D. Modem
Reason: A hub or switch serves as the central device that connects all
computers in a star topology.
32. Which type of network covers the smallest
geographical area?
A. LAN B. MAN C. PAN ✅ D. WAN
Reason: A Personal Area Network (PAN) connects devices within a very
short range around an individual.
33. Which type of network is commonly used in a school
computer laboratory?
A. PAN B. LAN ✅ C. MAN D. WAN
Reason: A Local Area Network (LAN) connects computers within a limited
area such as a school or office.
34. Which type of network covers a city or metropolitan
area?
A. PAN B. LAN C. MAN ✅ D. WAN
Reason: A Metropolitan Area Network (MAN) connects multiple LANs within
a city or metropolitan region.
35. Which type of network covers the largest geographical
area?
A. PAN B. LAN C. MAN D. WAN ✅
Reason: A Wide Area Network (WAN) connects computers over large
geographical areas, including countries and continents.
36. What is the full form of MAN?
A. Main Area Network B. Metropolitan Area Network ✅ C.
Multiple Access Network D. Multi Area Network
Reason: MAN stands for Metropolitan Area Network.
37. Network architecture refers to the ________.
A. Design and structure of a computer network ✅ B.
Speed of a network C. Type of Internet connection D. Number of computers
Reason: Network architecture defines how network devices are connected
and communicate with each other.
38. Which of the following is a type of network
architecture?
A. Star Topology B. Ring Topology C. Client-Server Network ✅ D.
WAN
Reason: Client-Server is a network architecture, whereas Star and Ring
are network topologies.
39. In a client-server network, resources and services
are provided by the ________.
A. Client B. Server ✅ C. Switch D. Router
Reason: The server provides shared resources and services to client
computers.
40. A computer that requests services from a server is
called a ________.
A. Gateway B. Client ✅ C. Hub D. Bridge
Reason: A client requests and uses services provided by a server.
41. In a peer-to-peer network, every computer is called a
________.
A. Server B. Client C. Peer ✅ D. Host
Reason: In a peer-to-peer network, every computer has equal status and
is called a peer.
42. Which operating system is specially designed for
managing servers?
A. Windows 11 B. Android C. Windows Server ✅ D.
Chrome OS
Reason: Windows Server is designed to manage users, resources, and
services in a client-server network.
43. Who is responsible for managing and maintaining a
client-server network?
A. Teacher B. Network Administrator ✅ C.
Student D. Customer
Reason: A network administrator manages the network, users, security,
and resources.
44. Which network architecture does NOT require a
dedicated server?
A. Client-Server B. Peer-to-Peer ✅ C.
Mainframe D. Cloud
Reason: Peer-to-peer networks allow computers to share resources without
a dedicated server.
45. Which network architecture is most suitable for a
small home network?
A. Client-Server B. Peer-to-Peer ✅ C.
MAN D. WAN
Reason: Peer-to-peer networks are simple, inexpensive, and suitable for
small networks.
46. Which network architecture is most suitable for large
organizations?
A. Peer-to-Peer B. Client-Server ✅ C.
PAN D. LAN
Reason: Client-server architecture provides centralized management,
better security, and efficient resource sharing.
47. What is the full form of IPv4?
A. Internet Provider Version 4 B. Internet Protocol Version
4 ✅ C. Internal Protocol Version 4 D. Internet Packet
Version 4
Reason: IPv4 stands for Internet Protocol Version 4.
48. Which version of the Internet Protocol uses a 128-bit
address?
A. IPv2 B. IPv3 C. IPv4 D. IPv6 ✅
Reason: IPv6 uses 128-bit addresses, providing a much larger address
space than IPv4.
49. IPv4 addresses are written in ________ notation.
A. Binary B. Decimal with dots ✅ C.
Hexadecimal D. Octal
Reason: IPv4 addresses use decimal numbers separated by dots (e.g.,
192.168.1.1).
50. Which symbol is used to separate groups in an IPv6
address?
A. Dot (.) B. Hyphen (-) C. Colon (:) ✅ D.
Slash (/)
Reason: IPv6 addresses are written in hexadecimal groups separated by
colons.
51. Approximately how many unique IP addresses can IPv4
generate?
A. 4.29 million B. 4.29 billion ✅ C.
4.29 trillion D. 3.4 × 10³⁸
Reason: IPv4 provides approximately 4.29 billion unique IP addresses.
52. Which version of the Internet Protocol was developed
to overcome IPv4 address exhaustion?
A. IPv3 B. IPv4 C. IPv5 D. IPv6 ✅
Reason: IPv6 was introduced to provide a much larger address space than
IPv4.
53. Which of the following is the largest computer
network in the world?
A. LAN B. MAN C. Internet ✅ D. Intranet
Reason: The Internet is the world's largest network, connecting millions
of devices globally.
54. Which network is designed for use only within an
organization?
A. Internet B. Intranet ✅ C. Extranet D. PAN
Reason: An intranet is a private network accessible only to authorized
members of an organization.
55. Which network allows selected external users to
access an organization's resources?
A. Internet B. Intranet C. Extranet ✅ D.
LAN
Reason: An extranet provides controlled access to authorized external
users such as suppliers and customers.
56. Which network is privately owned and maintained by an
organization?
A. Internet B. Intranet ✅ C. Extranet D. WAN
Reason: An intranet is a private network that is owned and used within
an organization.
57. Who can access the Internet?
A. Employees only B. Customers only C. Authorized staff only D.
Anyone with an Internet connection ✅
Reason: The Internet is a public network that can be accessed by anyone
with an Internet connection.
58. Communication mode refers to the ________.
A. Speed of data transmission B. Direction of data
transmission ✅ C. Size of a network D. Type of communication cable
Reason: Communication mode describes the direction in which data flows
between devices.
59. Which communication mode allows data to flow in only
one direction?
A. Half-duplex B. Full-duplex C. Simplex ✅ D.
Multiplex
Reason: In simplex mode, data flows only from the sender to the
receiver.
60. Which communication mode allows data to flow in both
directions, but only one direction at a time?
A. Simplex B. Half-duplex ✅ C. Full-duplex D. Broadcast
Reason: Half-duplex communication allows two-way communication, but not
simultaneously.
61. Which communication mode allows simultaneous two-way
communication?
A. Simplex B. Half-duplex C. Full-duplex ✅ D.
One-way
Reason: Full-duplex allows both devices to send and receive data at the
same time.
62. Which communication mode is commonly used in a mobile
phone conversation?
A. Simplex B. Half-duplex C. Full-duplex ✅ D.
Broadcast
Reason: Mobile phones allow both users to speak and listen
simultaneously.
63. Which command displays the IP address, subnet mask,
and default gateway of a computer?
A. ping B. ipconfig ✅ C. tracert D. nslookup
Reason: The ipconfig command displays the network configuration
of a computer.
64. Which command is used to test network connectivity
between two devices?
A. tracert B. nslookup C. ping ✅ D.
ipconfig
Reason: The ping command checks whether another device or host
can be reached over a network.
65. Which command displays the path (route) that data
packets travel to reach a destination?
A. ping B. ipconfig C. tracert ✅ D.
nslookup
Reason: The tracert command shows each router (hop) through which
data travels.
66. Which command is used to find the IP address
associated with a domain name?
A. ping B. tracert C. ipconfig D. nslookup ✅
Reason: The nslookup command retrieves the IP address of a domain
using the Domain Name System (DNS).
67. A network protocol is a set of rules that governs
________.
A. Computer storage B. Communication between devices on a
network ✅ C. Screen resolution D. Processor speed
Reason: A network protocol defines how devices communicate and exchange
data over a network.
68. Which protocol suite is the standard communication
protocol of the Internet?
A. FTP B. SMTP C. TCP/IP ✅ D. DHCP
Reason: TCP/IP is the standard protocol suite used for Internet
communication.
69. Which protocol automatically assigns IP addresses to
devices on a network?
A. HTTP B. FTP C. DHCP ✅ D. SMTP
Reason: DHCP automatically assigns IP addresses to network devices.
70. Which protocol is mainly used to transfer web pages
from a web server to a web browser?
A. FTP B. HTTP ✅ C. SMTP D. DHCP
Reason: HTTP is the standard protocol for transferring web pages.
71. Which protocol provides secure communication while
accessing websites?
A. HTTP B. HTTPS ✅ C. FTP D. SMTP
Reason: HTTPS encrypts communication between the browser and the web
server.
72. Which protocol is mainly used for sending e-mails?
A. FTP B. HTTP C. SMTP ✅ D. TCP/IP
Reason: SMTP is the standard protocol for sending e-mail messages.
73. Which protocol is mainly used to transfer files
between computers over a network?
A. FTP ✅ B. SMTP C. HTTP D. DHCP
Reason: FTP is designed for transferring files between computers.
74. Which protocol is mainly responsible for reliable
communication over the Internet?
A. Bluetooth B. TCP/IP ✅ C. FTP D. HTTP
Reason: TCP/IP manages reliable communication and data transmission
across networks.
75. Which protocol is mainly used to automatically assign
network configuration information to devices?
A. HTTP B. FTP C. SMTP D. DHCP ✅
Reason: DHCP automatically assigns IP addresses and other network
configuration settings to devices.
