75 MCQ [UNDERSTANDING LEVEL] - Computer Network and Communication - SEE COMPUTER SCIENCE - CDC NEW CURRICULUM 2083 [
1. Why is fiber-optic broadband generally faster than
DSL?
A. It uses telephone lines. B. It uses light signals to
transmit data. ✅ C. It requires more electricity. D. It uses
satellite signals.
Explanation: Fiber-optic cables transmit data using light, allowing much
higher speed and bandwidth than DSL, which uses copper telephone lines.
2. What is the main purpose of bandwidth in a
communication network?
A. To measure the number of users B. To indicate the maximum
amount of data that can be transmitted ✅ C. To count data packets D. To
measure storage capacity
Explanation: Bandwidth represents the maximum data-carrying capacity of
a network, not the actual amount of data transmitted.
3. Which statement correctly explains throughput?
A. It is always equal to bandwidth.
B. It is the actual amount of data successfully transmitted. ✅
C. It is the total storage capacity of a network.
D. It measures the frequency of signals.
Explanation: Throughput is the actual rate of successful data transfer
and is usually lower than the available bandwidth.
4. Why is data divided into packets before transmission?
A. To increase the monitor size.
B. To make data transmission more efficient and reliable. ✅
C. To reduce processor speed.
D. To improve battery life.
Explanation: Dividing data into packets allows efficient transmission
and makes it easier to retransmit only the lost packets.
5. Why is frequency important in telecommunication?
A. It increases computer memory.
B. It determines how signals are transmitted and received. ✅
C. It changes the operating system.
D. It stores Internet data.
Explanation: Different communication technologies operate on different
frequency ranges to transmit signals efficiently.
6. Which statement correctly compares 4G and 5G mobile
networks?
A. 4G is faster than 5G.
B. 5G provides higher speed and lower latency than 4G. ✅
C. Both provide identical performance.
D. 5G only supports voice calls.
Explanation: Compared with 4G, 5G offers faster data transmission, lower
latency, and better support for smart devices.
7. Which statement best explains the difference between
bandwidth and throughput?
A. They always have the same value.
B. Bandwidth is the maximum capacity, whereas throughput is the actual data
transferred. ✅
C. Throughput is always greater than bandwidth.
D. Bandwidth measures storage space.
Explanation: Bandwidth shows the network's maximum capacity, while
throughput shows the actual data successfully transmitted.
8. Why does 5G support more smart devices than earlier
mobile generations?
A. It uses fewer frequencies.
B. It is designed to handle a much larger number of connected devices
simultaneously. ✅
C. It replaces the Internet.
D. It only supports mobile phones.
Explanation: 5G is designed for massive device connectivity, making it
suitable for the Internet of Things (IoT) and smart environments.
9. Why is optical fiber generally faster than copper
cable?
A. It uses electricity. B. It uses light signals. ✅ C.
It is thicker. D. It has more connectors.
Explanation: Optical fiber transmits data using light, allowing higher
speed and lower signal loss than copper cables.
10. Which statement correctly explains the advantage of
guided media over unguided media?
A. It is more affected by weather.
B. It provides a more stable and secure communication path. ✅
C. It does not require cables.
D. It only works indoors.
Explanation: Guided media uses physical cables, making communication
more stable, secure, and less affected by interference.
11. What is the main purpose of Bluetooth technology?
A. Long-distance communication
B. Connecting nearby devices wirelessly ✅
C. Broadcasting television signals
D. Connecting Internet satellites
Explanation: Bluetooth is designed for short-range wireless
communication between nearby devices.
12. Which feature makes RFID suitable for attendance
systems and inventory management?
A. It requires Internet access.
B. It identifies objects using radio waves. ✅
C. It transmits video signals.
D. It uses optical fiber cables.
Explanation: RFID identifies and tracks tagged objects using radio
frequency signals without direct contact.
13. Why is optical fiber preferred for long-distance
communication?
A. It is inexpensive.
B. It has low signal loss and high transmission speed. ✅
C. It uses electrical signals.
D. It requires no connectors.
Explanation: Optical fiber supports long-distance communication because
it offers high speed with minimal signal loss.
14. Which statement correctly compares guided and
unguided media?
A. Both require physical cables.
B. Guided media uses cables, whereas unguided media transmits signals through
the air. ✅
C. Unguided media is always more secure.
D. Guided media only uses radio waves.
Explanation: Guided media uses physical cables, while unguided media
transmits data wirelessly through electromagnetic waves.
15. Why is Wi-Fi considered an unguided communication
medium?
A. It uses telephone lines.
B. It transmits data through radio waves without physical cables. ✅
C. It requires fiber optic cables.
D. It only works with Ethernet connectors.
Explanation: Wi-Fi sends and receives data wirelessly using radio waves
rather than cables.
16. Which communication medium is generally more suitable
for environments with strong electromagnetic interference?
A. CAT6 cable
B. Optical fiber ✅
C. Coaxial cable
D. Twisted pair cable
Explanation: Optical fiber uses light instead of electrical signals,
making it immune to electromagnetic interference.
17. Why is the RJ-45 connector widely used in Local Area
Networks (LANs)?
A. It stores network data. B. It provides a reliable
connection for Ethernet communication. ✅ C. It converts electrical
signals into light. D. It broadcasts wireless signals.
Explanation: The RJ-45 connector provides a stable and reliable wired
connection for Ethernet networks.
18. Which statement correctly explains the function of a
media converter?
A. It increases Internet speed.
B. It connects copper and fiber optic networks by converting signals. ✅
C. It assigns IP addresses.
D. It connects wireless devices.
Explanation: A media converter converts electrical signals into light
signals and vice versa, allowing copper and fiber optic networks to
communicate.
19. Why are media converters commonly used in large
organizations and Internet Service Providers (ISPs)?
A. They replace routers.
B. They allow long-distance, high-speed communication using fiber optic cables.
✅
C. They increase computer memory.
D. They broadcast Wi-Fi signals.
Explanation: Media converters enable the use of fiber optic cables for
faster communication over longer distances.
20. Which statement correctly compares an RJ-45 connector
and a media converter?
A. Both convert electrical signals into light.
B. An RJ-45 connector connects Ethernet cables, whereas a media converter
connects different transmission media. ✅
C. Both are wireless networking devices.
D. Both are used only with optical fiber cables.
Explanation: RJ-45 is a connector for Ethernet cables, while a media
converter links copper and fiber optic networks.
21. Why is fiber optic communication preferred when using
a media converter?
A. It uses radio waves.
B. It provides higher speed and longer transmission distance with less signal
loss. ✅
C. It requires no connectors.
D. It only works inside buildings.
Explanation: Fiber optic communication offers high-speed data
transmission over long distances with minimal signal loss.
22. Why is a switch generally more efficient than a hub?
A. It has fewer ports. B. It sends data only to the intended
destination device. ✅ C. It uses radio waves. D. It
converts signals into light.
Explanation: A switch forwards data only to the intended device,
reducing unnecessary network traffic and improving efficiency.
23. Why is a repeater used in a computer network?
A. To assign IP addresses automatically. B. To strengthen
weak signals and extend the communication distance. ✅ C.
To connect different protocols. D. To store network data.
Explanation: A repeater regenerates weak signals so they can travel
longer distances without significant signal loss.
24. Which statement correctly explains the function of a
bridge?
A. It broadcasts data to all devices.
B. It connects similar network segments and filters traffic between them. ✅
C. It converts digital signals into analog signals.
D. It provides wireless Internet access.
Explanation: A bridge connects similar LAN segments and reduces
unnecessary network traffic by filtering data.
25. Why is a router essential in modern computer
networks?
A. It connects different networks and forwards data using IP
addresses. ✅
B. It stores user files permanently.
C. It increases monitor resolution.
D. It replaces Ethernet cables.
Explanation: A router enables communication between different networks
by forwarding data packets based on IP addresses.
26. Which statement correctly compares a hub and a
switch?
A. Both send data only to the destination device.
B. A hub broadcasts data to all devices, whereas a switch sends data only to
the intended device. ✅
C. A switch works only wirelessly.
D. A hub uses IP addresses to forward packets.
Explanation: A hub broadcasts data to every connected device, while a
switch intelligently forwards data only to the correct destination.
27. Why are terminators used in a bus topology?
A. To increase data transmission speed. B. To prevent signal
reflection at both ends of the cable. ✅ C. To connect additional
computers. D. To amplify network signals.
Explanation: Terminators absorb signals at both ends of the backbone
cable, preventing signal reflection and data transmission errors.
28. Why is a star topology generally more reliable than a
bus topology?
A. It requires less cable.
B. Failure of one computer usually does not affect the other computers. ✅
C. It does not use a central device.
D. It is the cheapest topology.
Explanation: In a star topology, each computer has an independent
connection to the central device, so failure of one computer does not interrupt
the rest of the network.
29. Which statement correctly explains the advantage of a
hybrid topology?
A. It uses only one type of topology.
B. It combines the strengths of two or more topologies to improve flexibility
and performance. ✅
C. It requires no networking devices.
D. It can connect only two computers.
Explanation: Hybrid topology combines different network topologies,
allowing organizations to benefit from the strengths of each.
30. Why is a ring topology often less popular than a star
topology?
A. It does not use cables.
B. A failure in one device or cable can interrupt the entire network. ✅
C. It requires no maintenance.
D. It is only used in wireless networks.
Explanation: Since devices are connected in a closed loop, a failure in
one part of the ring may disrupt communication throughout the network.
31. Which statement correctly compares bus and star
topologies?
A. Both use a central hub or switch.
B. Bus topology uses a single backbone cable, whereas star topology uses a
central connecting device. ✅
C. Both require terminators.
D. Star topology forms a closed loop.
Explanation: Bus topology connects all devices to one backbone cable,
while star topology connects each device to a central hub or switch.
32. Why is a Personal Area Network (PAN) suitable for
connecting personal devices?
A. It covers an entire country. B. It is designed for
short-range communication between an individual's devices. ✅ C.
It requires optical fiber. D. It connects multiple cities.
Explanation: A PAN connects devices within a short distance, making it
ideal for personal gadgets such as smartphones, laptops, and wireless
headphones.
33. Which statement correctly explains the advantage of a
Local Area Network (LAN)?
A. It connects computers across different countries.
B. It provides fast communication within a limited geographical area. ✅
C. It uses satellites for communication.
D. It covers an entire metropolitan city.
Explanation: A LAN offers high-speed communication within a small area
such as a school, office, or home.
34. Why is a Metropolitan Area Network (MAN) suitable for
connecting different offices within the same city?
A. It covers only one room.
B. It is designed to connect multiple LANs across a metropolitan area. ✅
C. It uses Bluetooth communication.
D. It replaces the Internet.
Explanation: A MAN connects multiple LANs within a city, making it
suitable for organizations with branches in the same metropolitan area.
35. Which statement correctly explains the purpose of a
Wide Area Network (WAN)?
A. It connects only personal devices.
B. It connects computers over large geographical areas such as countries or
continents. ✅
C. It connects computers within one classroom.
D. It is used only for Bluetooth communication.
Explanation: A WAN connects networks across long distances, enabling
communication between cities, countries, and continents.
36. Which statement correctly compares LAN and WAN?
A. Both cover the same geographical area.
B. LAN covers a small geographical area, whereas WAN connects networks over
much larger distances. ✅
C. WAN is always faster than LAN.
D. LAN uses only wireless communication.
Explanation: A LAN is limited to a small area, while a WAN connects
networks across much larger geographical regions.
37. Why is a client-server network generally more secure
than a peer-to-peer network?
A. It uses less cable.
B. It provides centralized control over users and resources. ✅
C. It does not require a server.
D. It allows every computer to manage the network.
Explanation: A client-server network provides centralized
administration, making it easier to control user access and protect shared
resources.
38. Why is centralized backup possible in a client-server
network?
A. Every client stores its own backup.
B. Data is managed and stored through the central server. ✅
C. Backup is not required.
D. Each peer stores the same data.
Explanation: A central server stores and manages data, making backup
easier and more reliable.
39. Why is a peer-to-peer network less expensive than a
client-server network?
A. It requires more servers.
B. It does not require a dedicated server. ✅
C. It uses optical fiber only.
D. It needs a network administrator.
Explanation: Since no dedicated server is required, installation and
maintenance costs are lower.
40. Which statement correctly explains the role of a
server in a client-server network?
A. It only receives data from clients.
B. It manages and provides shared resources and services to clients. ✅
C. It replaces routers and switches.
D. It connects different cities.
Explanation: The server centrally manages resources such as files,
printers, and user accounts.
41. Why is a network administrator important in a
client-server network?
A. To repair hardware daily.
B. To manage users, security, and shared resources. ✅
C. To create Internet connections.
D. To increase processor speed.
Explanation: A network administrator is responsible for maintaining the
network and ensuring secure access to resources.
42. Which statement correctly explains a peer in a
peer-to-peer network?
A. It can only receive resources.
B. It can both provide and use shared resources. ✅
C. It only acts as a server.
D. It cannot share files.
Explanation: Every peer has equal responsibilities and can both share
and access resources.
43. Why is a client-server network more suitable for
large organizations?
A. Every computer has equal responsibilities.
B. It provides centralized management, better security, and efficient resource
sharing. ✅
C. It does not require maintenance.
D. It eliminates the need for servers.
Explanation: Large organizations benefit from centralized control,
making network management more secure and efficient.
44. Which statement correctly compares client-server and
peer-to-peer networks?
A. Both require a dedicated server.
B. Client-server uses centralized management, whereas peer-to-peer gives equal
responsibility to all computers. ✅
C. Peer-to-peer provides better centralized security.
D. Both have identical network structures.
Explanation: Client-server relies on a central server, while
peer-to-peer allows all computers to function equally.
45. Why can each computer in a peer-to-peer network act
as both a client and a server?
A. Because there is no central server, and each computer can
both provide and use shared resources. ✅
B. Because every computer is connected to the Internet.
C. Because only one computer controls the network.
D. Because peer-to-peer networks use Windows Server.
Explanation: In a peer-to-peer network, every computer has equal
responsibilities and can both share and access resources.
46. Which statement best explains the main difference
between client-server and peer-to-peer networks?
A. Client-server uses centralized resource management,
whereas peer-to-peer distributes resource sharing among all computers. ✅
B. Both networks require dedicated servers.
C. Peer-to-peer uses routers only.
D. Client-server cannot share files.
Explanation: Client-server networks depend on centralized management,
whereas peer-to-peer networks share responsibilities equally among connected
computers.
47. Which statement correctly explains why IPv6 was
introduced?
A. To replace computer networks.
B. To provide a much larger address space than IPv4. ✅
C. To increase processor speed.
D. To replace Ethernet cables.
Explanation: IPv6 was developed to solve IPv4 address exhaustion by
providing a significantly larger number of unique IP addresses.
48. Why does every device connected to a network require
an IP address?
A. To increase Internet speed.
B. To identify the device and enable communication with other devices. ✅
C. To store files.
D. To improve screen resolution.
Explanation: An IP address uniquely identifies a device on a network so
that data can be delivered to the correct destination.
49. Which statement correctly compares IPv4 and IPv6
addressing?
A. Both use decimal numbers separated by dots.
B. IPv4 uses decimal notation, whereas IPv6 uses hexadecimal notation separated
by colons. ✅
C. IPv4 uses hexadecimal notation, whereas IPv6 uses decimal notation.
D. Both use 128-bit addresses.
Explanation: IPv4 uses decimal numbers separated by dots, while IPv6
uses hexadecimal groups separated by colons.
50. Why can IPv6 support future Internet growth better
than IPv4?
A. It requires fewer devices.
B. It provides a much larger address space. ✅
C. It uses shorter addresses.
D. It works only on wireless networks.
Explanation: IPv6 provides an enormous number of unique addresses,
making it suitable for the increasing number of Internet-connected devices.
51. Which statement correctly explains the purpose of an
IP address?
A. It stores webpages.
B. It identifies devices and helps route data across a network. ✅
C. It increases bandwidth.
D. It replaces MAC addresses.
Explanation: An IP address identifies a device and enables data packets
to reach the correct destination through the network.
52. Which statement correctly explains one advantage of
IPv6 over IPv4?
A. IPv6 provides a larger address space for future
expansion. ✅
B. IPv6 uses fewer bits than IPv4.
C. IPv6 uses decimal notation.
D. IPv6 supports fewer devices.
Explanation: IPv6 uses 128-bit addresses, providing a vastly larger
address space than IPv4.
53. Why is an intranet generally more secure than the
Internet?
A. It is slower than the Internet. B. Only authorized users
are allowed to access it. ✅ C. It does not use TCP/IP. D.
It works without servers.
Explanation: An intranet is a private network with restricted access,
making it more secure than the public Internet.
54. Which statement correctly explains the purpose of an
intranet?
A. It connects countries worldwide.
B. It improves communication and resource sharing within an organization. ✅
C. It provides free Internet access.
D. It replaces the World Wide Web.
Explanation: An intranet allows employees to communicate, share files,
and access organizational resources securely.
55. Which statement correctly explains the purpose of an
extranet?
A. It allows anyone to access company resources.
B. It provides controlled access to selected external users. ✅
C. It replaces the Internet completely.
D. It is used only inside a school.
Explanation: An extranet extends part of an organization's network to
trusted external users such as suppliers or business partners.
56. Which statement correctly compares the Internet and
an intranet?
A. Both are private networks.
B. The Internet is a public network, whereas an intranet is a private
organizational network. ✅
C. Both can be accessed only by employees.
D. An intranet covers the whole world.
Explanation: The Internet is publicly accessible, whereas an intranet is
restricted to authorized members of an organization.
57. Why do Internet, intranet, and extranet all use the
TCP/IP protocol suite?
A. Because TCP/IP provides a standard method for
communication between network devices. ✅
B. Because TCP/IP increases storage capacity.
C. Because TCP/IP replaces operating systems.
D. Because TCP/IP converts electrical signals into light.
Explanation: TCP/IP is the standard protocol suite that enables reliable
communication across different types of computer networks.
58. Why is simplex communication called one-way
communication?
A. Both devices send data simultaneously. B. Data flows only
from the sender to the receiver. ✅ C. Both devices receive data
only. D. Data flows through two cables.
Explanation: In simplex communication, data travels in only one
direction, so the receiver cannot send data back.
59. Which statement correctly explains half-duplex
communication?
A. Both devices transmit data simultaneously.
B. Both devices can communicate, but only one can transmit at a time. ✅
C. Data flows in only one direction.
D. It does not allow feedback.
Explanation: Half-duplex communication allows two-way communication, but
devices must take turns transmitting data.
60. Why is full-duplex communication more efficient than
half-duplex communication?
A. It uses fewer devices.
B. Both devices can send and receive data at the same time. ✅
C. It requires no communication channel.
D. It transmits only voice signals.
Explanation: Full-duplex communication eliminates waiting time by
allowing simultaneous transmission and reception of data.
61. Which statement correctly compares simplex and
full-duplex communication?
A. Both allow simultaneous two-way communication.
B. Simplex allows one-way communication, whereas full-duplex allows
simultaneous two-way communication. ✅
C. Both require users to take turns sending data.
D. Full-duplex allows only one-way communication.
Explanation: Simplex supports one-way communication only, whereas
full-duplex allows both devices to communicate simultaneously.
62. What is the main advantage of duplex communication
over simplex communication?
A. It increases computer storage.
B. It allows feedback between communicating devices. ✅
C. It eliminates the need for communication media.
D. It reduces the number of computers.
Explanation: Duplex communication enables two-way communication,
allowing the receiver to respond to the sender.
63. Which statement correctly explains the purpose of the
ping command?
A. It displays the computer's IP configuration.
B. It checks whether another device or host can be reached over a network. ✅
C. It traces the route taken by data packets.
D. It finds the IP address of a domain name.
Explanation: The ping command tests network connectivity by
sending packets to another device and checking for a response.
64. Why is the ipconfig command useful for network
troubleshooting?
A. It displays the route taken by data packets.
B. It shows the computer's network configuration, including the IP address and
default gateway. ✅
C. It tests Internet speed.
D. It sends e-mail messages.
Explanation: The ipconfig command helps identify network
configuration problems by displaying important network settings.
65. Which statement correctly explains the purpose of the
tracert command?
A. It automatically assigns IP addresses.
B. It displays the path that data packets follow to reach a destination. ✅
C. It encrypts Internet communication.
D. It transfers files between computers.
Explanation: The tracert command identifies each router (hop)
through which data passes before reaching its destination.
66. Why is the nslookup command useful in a computer
network?
A. It converts electrical signals into light.
B. It retrieves the IP address associated with a domain name. ✅
C. It measures network bandwidth.
D. It detects computer viruses.
Explanation: The nslookup command queries the Domain Name System
(DNS) to find the IP address of a domain.
67. Why are network protocols essential in computer
communication?
A. They increase computer memory. B. They provide a common
set of rules for communication between devices. ✅ C. They improve screen
resolution. D. They replace network cables.
Explanation: Network protocols define standard rules that allow
different devices to communicate and exchange data correctly.
68. Which statement correctly explains the purpose of the
TCP/IP protocol suite?
A. It transfers files only.
B. It enables reliable communication between devices over interconnected
networks. ✅
C. It is used only for sending e-mails.
D. It is used only for web browsing.
Explanation: TCP/IP provides the standard rules that allow devices on
different networks to communicate reliably over the Internet.
69. Why is DHCP useful in a computer network?
A. It automatically assigns IP addresses and network
settings to devices. ✅
B. It transfers files between computers.
C. It encrypts websites.
D. It sends e-mails.
Explanation: DHCP simplifies network management by automatically
providing IP addresses and other network configuration information.
70. Which statement correctly explains the purpose of
HTTP?
A. It transfers web pages from a web server to a web
browser. ✅
B. It automatically assigns IP addresses.
C. It sends e-mails.
D. It transfers files between computers.
Explanation: HTTP enables web browsers to request and receive web pages
from web servers.
71. Why is HTTPS preferred over HTTP for online
transactions?
A. It loads webpages faster.
B. It encrypts communication between the browser and the web server. ✅
C. It automatically assigns IP addresses.
D. It transfers files more efficiently.
Explanation: HTTPS encrypts transmitted data, protecting sensitive
information such as passwords and banking details.
72. Which statement correctly explains the purpose of
SMTP?
A. It sends e-mail messages from the sender to the mail
server. ✅
B. It transfers webpages.
C. It assigns IP addresses.
D. It traces network routes.
Explanation: SMTP is responsible for sending outgoing e-mail messages
across computer networks.
73. Why is FTP used instead of HTTP when transferring
large files?
A. FTP is designed specifically for file transfer between
computers. ✅
B. FTP assigns IP addresses automatically.
C. FTP encrypts all Internet traffic.
D. FTP manages wireless communication.
Explanation: FTP provides services specifically for uploading and
downloading files between computers over a network.
74. Which statement correctly compares HTTP and HTTPS?
A. Both provide the same level of security.
B. HTTPS encrypts data, whereas HTTP transmits data without encryption. ✅
C. HTTP is used only for e-mail communication.
D. HTTPS is used only for file transfer.
Explanation: HTTPS adds encryption to HTTP, making communication more
secure.
75. Why do devices on different networks communicate
successfully using TCP/IP?
A. Because TCP/IP provides standardized communication rules
understood by all compatible devices. ✅
B. Because TCP/IP increases Internet speed.
C. Because TCP/IP replaces routers.
D. Because TCP/IP stores webpages.
Explanation: TCP/IP establishes common communication standards, allowing
devices from different manufacturers and networks to exchange data reliably.
