Q.1 What is the primary purpose of a communication protocol in computer networks?
To define network hardware specifications
To enable secure data storage
To establish rules for data transmission
To compress data for faster processing
Explanation - Communication protocols define rules and conventions for data exchange between devices, ensuring reliable communication.
Correct answer is: To establish rules for data transmission
Q.2 Which layer of the OSI model is responsible for end-to-end delivery of messages?
Physical Layer
Transport Layer
Network Layer
Data Link Layer
Explanation - The Transport Layer ensures end-to-end communication, error detection, and data flow control between devices.
Correct answer is: Transport Layer
Q.3 Which of the following is a characteristic of optical fiber communication?
High susceptibility to electromagnetic interference
Low bandwidth
High data transmission speed
Limited distance coverage
Explanation - Optical fiber uses light for data transmission, enabling extremely high bandwidth and speed over long distances.
Correct answer is: High data transmission speed
Q.4 In mobile communication, what does LTE stand for?
Long-Term Evolution
Light Transmission Efficiency
Low Traffic Exchange
Local Telecommunication Extension
Explanation - LTE is a standard for high-speed wireless communication for mobile devices and data terminals.
Correct answer is: Long-Term Evolution
Q.5 Which type of modulation is commonly used in modern digital communication systems?
Amplitude Modulation (AM)
Frequency Modulation (FM)
Phase Shift Keying (PSK)
Pulse Modulation (PM)
Explanation - PSK is widely used in digital communication for transmitting data efficiently and reliably.
Correct answer is: Phase Shift Keying (PSK)
Q.6 What is the function of a router in a network?
Store files centrally
Connect multiple networks and direct data packets
Encrypt network traffic
Provide internet access to a single device
Explanation - Routers manage traffic between networks, forwarding data packets to the correct destination based on IP addresses.
Correct answer is: Connect multiple networks and direct data packets
Q.7 Which communication technology is primarily used in IoT devices?
Bluetooth
Ethernet
Morse Code
Satellite TV
Explanation - Bluetooth is a low-power wireless technology commonly used for short-range communication in IoT devices.
Correct answer is: Bluetooth
Q.8 In networking, what does the term 'latency' refer to?
Amount of data lost during transmission
Time delay in data communication
Maximum bandwidth achievable
Number of devices connected
Explanation - Latency is the delay between sending and receiving data across a network.
Correct answer is: Time delay in data communication
Q.9 Which of the following is a public-key cryptography algorithm?
AES
DES
RSA
MD5
Explanation - RSA uses a pair of keys (public and private) to encrypt and decrypt data, ensuring secure communication.
Correct answer is: RSA
Q.10 What does 5G technology primarily improve over 4G?
Lower frequency
Higher latency
Faster data speed and lower latency
Longer cable connections
Explanation - 5G offers higher bandwidth, faster speeds, and lower latency compared to 4G networks, enabling advanced applications.
Correct answer is: Faster data speed and lower latency
Q.11 Which device regenerates a digital signal to its original strength in a network?
Switch
Hub
Repeater
Modem
Explanation - A repeater amplifies and retransmits signals to extend the range of digital communication.
Correct answer is: Repeater
Q.12 Which is the standard wireless networking protocol for local area networks (LANs)?
Wi-Fi
Bluetooth
ZigBee
NFC
Explanation - Wi-Fi (IEEE 802.11 standards) is used for wireless LANs to connect devices to the internet or other networks.
Correct answer is: Wi-Fi
Q.13 Which layer of the TCP/IP model corresponds to the OSI Transport Layer?
Application Layer
Internet Layer
Transport Layer
Network Access Layer
Explanation - In the TCP/IP model, the Transport Layer manages end-to-end communication, similar to OSI's Transport Layer.
Correct answer is: Transport Layer
Q.14 What is the main advantage of packet switching over circuit switching?
Faster hardware requirement
More efficient use of network resources
Requires dedicated connection
Reduces signal loss completely
Explanation - Packet switching divides data into packets that share network paths, improving resource utilization and efficiency.
Correct answer is: More efficient use of network resources
Q.15 Which of the following is a primary feature of satellite communication?
Short-distance communication only
Requires physical cables
Supports long-distance global communication
Limited to mobile phones
Explanation - Satellite communication allows signals to be transmitted over long distances, including international coverage.
Correct answer is: Supports long-distance global communication
Q.16 Which protocol is used for sending emails over the Internet?
HTTP
FTP
SMTP
IMAP
Explanation - SMTP (Simple Mail Transfer Protocol) is used to send emails, while IMAP and POP are used to receive them.
Correct answer is: SMTP
Q.17 What does the term 'bandwidth' in communication systems refer to?
Time delay in transmission
Maximum data transfer rate
Error rate in data
Number of connected devices
Explanation - Bandwidth indicates the capacity of a channel to transmit data over a network in a given time period.
Correct answer is: Maximum data transfer rate
Q.18 Which type of network topology has a single central node to which all devices are connected?
Bus Topology
Ring Topology
Star Topology
Mesh Topology
Explanation - In a star topology, all devices are connected to a central hub or switch, which manages communication.
Correct answer is: Star Topology
Q.19 Which technology enables voice communication over the Internet?
VoIP
VPN
HTTP
SMTP
Explanation - VoIP (Voice over Internet Protocol) allows voice transmission using IP networks instead of traditional telephone lines.
Correct answer is: VoIP
Q.20 Which wireless technology is primarily used for contactless payments?
Bluetooth
NFC
Wi-Fi
ZigBee
Explanation - Near Field Communication (NFC) enables short-range communication, widely used in contactless payment systems.
Correct answer is: NFC
Q.21 What is the primary purpose of a modem in communication systems?
Modulate and demodulate signals for transmission
Store digital data
Encrypt messages
Connect multiple networks
Explanation - A modem converts digital signals from a computer into analog signals for transmission over telephone lines and vice versa.
Correct answer is: Modulate and demodulate signals for transmission
Q.22 Which frequency band is typically used for Wi-Fi communication in homes?
2.4 GHz and 5 GHz
700 MHz
1.8 GHz
3.5 GHz
Explanation - Wi-Fi networks commonly operate in the 2.4 GHz and 5 GHz frequency bands, offering a balance between coverage and speed.
Correct answer is: 2.4 GHz and 5 GHz
Q.23 Which is the main feature of cloud communication services?
Require on-premise hardware
Enable communication over the Internet without physical infrastructure
Limited to LAN networks
Require specialized cabling
Explanation - Cloud communication allows users to send and receive messages, calls, and data over the Internet using virtual infrastructure.
Correct answer is: Enable communication over the Internet without physical infrastructure
Q.24 What is the primary function of DNS (Domain Name System) in the Internet?
Translate IP addresses into domain names
Encrypt web traffic
Manage bandwidth allocation
Store email messages
Explanation - DNS converts human-readable domain names into IP addresses that computers use to locate each other on the Internet.
Correct answer is: Translate IP addresses into domain names