The Article with the heading 2023 Data Communication and Networking MCQs having 45 Multiple Choice Questions as Set1/ Series1 with the Correct Answer as well as Proper Explanation that is beneficial for all students who are preparing for Competitive Examinations related to Computer Science (CS) such as BSTET (Bihar STET), BPSC Computer Teacher, Banking Examinations etc.
2023 Data Communication and Networking MCQs (Q1 to Q5)
Question1. What does the acronym “LAN” stand for?
a. Local Area Network
b. Long Area Network
c. Large Array Node
d. Low-bandwidth Access Network
Correct Answer: a
Explanation: The acronym “LAN” stands for “Local Area Network,” which refers to a network that covers a limited geographic area, such as a home, office, or campus.
Question2. Which device is used to connect multiple computers in a network and manage the traffic between them?
a. Router
b. Modem
c. Hub
d. Switch
Correct Answer: d
Explanation: A switch is used to connect multiple computers in a network and manage the traffic between them by forwarding data only to the intended recipient, enhancing network efficiency.
Question3. What type of network covers a larger geographical area, such as a city or a country?
a. PAN (Personal Area Network)
b. LAN (Local Area Network)
c. MAN (Metropolitan Area Network)
d. WLAN (Wireless Local Area Network)
Correct Answer: c
Explanation: A MAN, or Metropolitan Area Network, covers a larger geographic area than a LAN and is typically used to connect multiple LANs within a city or metropolitan region.
Question4. Which network topology connects all devices in a circular chain?
a. Bus Topology
b. Star Topology
c. Ring Topology
d. Mesh Topology
Correct Answer: c
Explanation: A ring topology connects all devices in a circular chain, where data travels in one direction, passing through each device until it reaches its destination.
Question5. What is the purpose of a MAC address in networking?
a. To identify a website’s IP address
b. To identify a user’s login credentials
c. To identify a device’s unique hardware address
d. To identify the network’s physical location
Correct Answer: c
Explanation: A MAC (Media Access Control) address is a unique hardware address assigned to each network interface controller (NIC) in a device. It is used to identify devices on a network.
2023 Data Communication and Networking (DCN) for BSTET (Bihar STET) MCQs (Q6 to Q10)
Question6. What protocol is used for sending emails over the Internet?
a. FTP (File Transfer Protocol)
b. SMTP (Simple Mail Transfer Protocol)
c. HTTP (Hypertext Transfer Protocol)
d. DNS (Domain Name System)
Correct Answer: b
Explanation: SMTP (Simple Mail Transfer Protocol) is used for sending emails over the Internet, allowing email clients to send messages to a mail server for delivery.
Question7. Which layer of the OSI model is responsible for routing and logical addressing?
a. Data Link Layer
b. Transport Layer
c. Network Layer
d. Application Layer
Correct Answer: c
Explanation: The Network Layer of the OSI model is responsible for routing, logical addressing, and forwarding data packets between different networks.
Question8. What is the purpose of DNS (Domain Name System) in networking?
a. Encrypting data for secure transmission
b. Converting domain names to IP addresses
c. Providing physical addressing for devices
d. Managing network traffic flow
Correct Answer: b
Explanation: DNS (Domain Name System) translates human-readable domain names into IP addresses, allowing users to access websites using domain names instead of numeric IP addresses.
Question9. Which wireless security protocol is considered the most secure for protecting Wi-Fi networks?
a. WEP (Wired Equivalent Privacy)
b. WPA (Wi-Fi Protected Access)
c. WPS (Wi-Fi Protected Setup)
d. WPA3 (Wi-Fi Protected Access 3)
Correct Answer: d
Explanation: WPA3 (Wi-Fi Protected Access 3) is the latest and most secure wireless security protocol designed to enhance the security of Wi-Fi networks and protect against various attacks.
Question10. What is the maximum data transfer speed of a standard Ethernet connection?
a. 100 Mbps
b. 1 Gbps
c. 10 Gbps
d. 100 Gbps
Correct Answer: b
Explanation: The maximum data transfer speed of a standard Ethernet connection, often referred to as Gigabit Ethernet, is 1 Gbps (Gigabit per second), providing high-speed data transmission.
2023 Data Communication and Networking (DCN) for BPSC Teacher (Computer Science) MCQs (Q11 to Q15)
Question11. What does IP stand for in the context of networking?
a. Internet Provider
b. Internet Port
c. Internet Protocol
d. Intranet Port
Answer: c. Internet Protocol
Explanation: IP stands for Internet Protocol that is a Network Layer Protocol.
Question12. What does URL stand for?
a. Uniform Resource Locator
b. Universal Remote Locator
c. Unified Resource Link
d. United Remote Locator
Answer: a. Uniform Resource Locator
Explanation: A URL (Uniform Resource Locator) is a web address used to specify the location of a resource on the internet. It consists of various components, including the protocol (e.g., HTTP or HTTPS), domain name, path, and optional parameters. URLs are used to access websites, files, and other online resources.
Question13. In the context of IP addresses, what does DHCP stand for?
a. Domain Host Control Protocol
b. Dynamic Host Configuration Protocol
c. Digital Hardware Control Protocol
d. Data Handling Control Protocol
Answer: b. Dynamic Host Configuration Protocol
Explanation: Dynamic Host Configuration Protocol (DHCP) is a network protocol that automatically assigns IP addresses, subnet masks, and other network configuration settings to devices when they connect to a network. This dynamic assignment eliminates the need for manual IP configuration.
Question14. Which type of network topology uses a central hub to connect all devices?
a. Star Topology
b. Bus Topology
c. Ring Topology
d. Mesh Topology
Answer: a. Star Topology
Explanation: In a Star Topology, all devices are connected to a central hub, like a switch or a router. The hub serves as a central point for data communication and allows devices to communicate with each other through the hub. This topology is common in LAN setups.
Question15. What is the purpose of a firewall in a network?
a. Speed up network traffic
b. Filter and block unauthorized access
c. Connect multiple networks together
d. Translate domain names to IP addresses
Answer: b. Filter and block unauthorized access
Explanation: A firewall is a network security device that monitors and controls incoming and outgoing network traffic. Its primary role is to filter traffic and enforce security policies to prevent unauthorized access and potential cyber threats from entering or exiting a network.
2023 DCN (Data Communication and Networking) MCQs [Multiple Choice Questions] (Q16- Q20)
Question16. Explain the difference between TCP and UDP protocols.
a. TCP ensures reliable data delivery, while UDP is faster but unreliable
b. TCP is used for video streaming, while UDP is used for web browsing
c. TCP is connectionless, while UDP is connection-oriented
d. TCP uses port numbers, while UDP uses IP addresses for communication
Answer: a. TCP ensures reliable data delivery, while UDP is faster but unreliable
Explanation: TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) are both transport layer protocols used in data communication. TCP provides reliable, connection-oriented communication with error checking and retransmission of lost data, making it suitable for applications like file transfers and web browsing. UDP, on the other hand, is connectionless and faster but does not guarantee delivery, making it suitable for real-time applications like streaming and online gaming.
Question17. Describe the process of subnetting in IP networking.
a. Subnetting is dividing a network into smaller subnetworks for better security
b. Subnetting is a process of creating virtual LANs
c. Subnetting is used to connect multiple LANs together
d. Subnetting is a method of securing wireless networks
Answer: a. Subnetting is dividing a network into smaller subnetworks for better security
Explanation: Subnetting involves dividing a large network into smaller subnetworks, known as subnets. This practice improves network efficiency, enhances security, and allows for better management of IP addresses. Subnetting is often used to logically group devices based on their functions, departments, or locations within an organization.
Question18. How does SSL/TLS contribute to secure online communication?
a. SSL/TLS encrypts data to prevent unauthorized access
b. SSL/TLS accelerates data transfer speed
c. SSL/TLS replaces the need for passwords
d. SSL/TLS improves network routing efficiency
Answer: a. SSL/TLS encrypts data to prevent unauthorized access
Explanation: SSL (Secure Sockets Layer) and its successor TLS (Transport Layer Security) are cryptographic protocols that provide secure communication over networks, such as the internet. One of their primary functions is to encrypt data during transmission, making it unreadable to unauthorized parties. This encryption prevents eavesdropping and data interception by malicious individuals. SSL/TLS certificates also help verify the authenticity of websites, ensuring users are connecting to legitimate servers.
Question19. What is a MAC address, and how is it different from an IP address?
a. A MAC address is used for software identification, while an IP address is for hardware identification
b. A MAC address is assigned by the ISP, while an IP address is assigned by the device manufacturer
c. A MAC address is permanent and tied to a device, while an IP address can change
d. A MAC address is only used in wireless networks, while an IP address is used in wired networks
Answer: c. A MAC address is permanent and tied to a device, while an IP address can change
Explanation: A “MAC address” (Media Access Control address) is a unique identifier assigned to a network interface card (NIC) at the hardware level. It is a fixed address associated with the physical device and remains constant throughout the device’s lifetime. On the other hand, an “IP address” (Internet Protocol address) is a logical address assigned to devices on a network to enable communication. IP addresses can change based on network configurations and dynamic assignment methods like DHCP. MAC addresses are used for local network communication, while IP addresses facilitate communication across the broader internet.
Question20. What does the term “data communication” refer to?
a) Communicating with animals
b) Exchanging information between two devices
c) Sharing emotions with others
d) Writing code for software
Answer: b) Exchanging information between two devices
Explanation: Data communication involves the exchange of information between two devices using a communication channel. It allows the transfer of data, such as text, images, or videos, between sender and receiver devices.
DCN (Data Communication and Computer Networking) MCQs (Q21- Q25)
Question21. Which of the following is an example of a communication channel?
a) A cup of coffee
b) A computer keyboards
c) A telephone lines
d) A chair
Answer: c) A telephone lines
Explanation: A communication channel is a medium through which data is transmitted. In this case, a telephone line serves as a communication channel for voice and data transmission.
Question22. What is the purpose of a modem in data communication?
a) To modify data files
b) To convert digital signals to analog signals and vice versa
c) To store data
d) To display graphics on a screen
Answer: b) To convert digital signals to analog signals and vice versa
Explanation: A modem (modulator-demodulator) is a device that modulates digital data into analog signals for transmission over analog communication channels and demodulates received analog signals back into digital data.
Question23. Which type of signal has only two possible values: 0 and 1?
a) Analog signal
b) Continuous signal
c) Digital signal
d) Complex signal
Answer: c) Digital signal
Explanation: A digital signal is a discrete signal that can take on only two possible values, usually represented as 0 and 1. It is used in digital communication systems to represent data.
Question24. What is the difference between simplex and full-duplex communication?
a) Simplex allows data transmission in both directions, while full-duplex allows data transmission in only one direction.
b) Simplex allows data transmission in only one direction, while full-duplex allows data transmission in both directions.
c) Simplex allows unlimited data transmission, while full-duplex has limitations.
d) Simplex and full-duplex are two terms for the same type of communication.
Answer: b) Simplex allows data transmission in only one direction, while full-duplex allows data transmission in both directions.
Explanation: Simplex communication allows data transmission in only one direction, like a radio broadcast. Full-duplex communication allows data transmission in both directions simultaneously, like a telephone conversation.
Question25. What is latency in data communication?
a) The amount of data that can be transmitted in a given time
b) The time it takes for data to travel from the source to the destination
c) The quality of the communication channel
d) The type of protocol used for communication
Answer: b) The time it takes for data to travel from the source to the destination
Explanation: Latency is the time delay between the sending of data from the source and the reception of data at the destination. It is influenced by factors like distance, network congestion, and processing time.
Data Communication and Networking MCQs (Q26- Q30)
Question26. What is the purpose of a router in data communication?
a) To convert analog signals to digital signals
b) To amplify data signals
c) To connect devices within a LAN
d) To route data packets between different networks
Answer: d) To route data packets between different networks
Explanation: A router is a networking device that forwards data packets between networks. It determines the optimal path for data to travel from the source to the destination network.
Question27. What is the term used to describe a system’s ability to recover from errors without disrupting the entire communication process?
a) Error tolerance
b) Data encryption
c) Data compression
d) Data integrity
Answer: a) Error tolerance
Explanation: Error tolerance refers to a system’s ability to continue functioning even if errors occur during data transmission. It ensures that the communication process is not completely disrupted by occasional errors.
Question28. What is multiplexing in data communication?
a) A process of breaking data into small packets
b) A process of combining multiple data streams into a single transmission medium
c) A type of data compression technique
d) A process of encrypting data for secure transmission
Answer: b) A process of combining multiple data streams into a single transmission medium
Explanation: Multiplexing is the technique of combining multiple data streams into a single transmission medium to increase the efficiency of data communication. It allows multiple signals to share the same channel.
Question29. What is the OSI model in data communication?
a) An advanced modem technology
b) A networking protocol for wireless communication
c) A conceptual framework that standardizes the functions of a communication system into seven layers
d) A type of LAN topology
Answer: c) A conceptual framework that standardizes the functions of a communication system into seven layers
Explanation: The OSI (Open Systems Interconnection) model is a conceptual framework that divides the communication process into seven layers, each responsible for specific functions in data communication.
Question30. What is the purpose of error detection and correction codes in data communication?
a) To prevent data from being transmitted
b) To provide an alternative data path
c) To ensure that data is transmitted without errors and can be corrected if errors occur
d) To increase latency in communication
Answer: c) To ensure that data is transmitted without errors and can be corrected if errors occur
Explanation: Error detection and correction codes are used to identify and correct errors that may occur during data transmission. They enhance the reliability of data communication by ensuring accurate data delivery.
Data Communication and Networking MCQs (Q31- Q35)
Question31. What is packet switching in data communication?
a) A method of data transmission that uses analog signals
b) A method of data transmission that uses a single communication channel
c) A method of data transmission that breaks data into small packets and sends them independently
d) A method of data transmission that encrypts all data packets
Answer: c) A method of data transmission that breaks data into small packets and sends them independently
Explanation: Packet switching involves breaking large blocks of data into smaller packets and sending them independently across the network. This approach improves efficiency and robustness in data transmission.
Question32. Which of the following best describes a Local Area Network (LAN)?
a) A network that covers a large geographic area
b) A network that connects devices across different cities
c) A network that connects devices within a limited area, such as an office or a home
d) A network used for intercontinental communication
Answer: c) A network that connects devices within a limited area, such as an office or a home
Explanation: A Local Area Network (LAN) is a network that covers a small geographic area and connects devices like computers, printers, and servers within that area.
Question33. What is the primary advantage of a LAN?
a) High-speed internet connection
b) Low cost of setup and maintenance
c) Global coverage
d) Satellite communication
Answer: b) Low cost of setup and maintenance
Explanation: LANs are cost-effective to set up and maintain because they cover a smaller area and require less cabling and infrastructure compared to larger networks.
Question34. Which device is commonly used to connect devices in a LAN?
a) Router
b) Satellite dish
c) Mainframe computer
d) Microwave transmitter
Answer: a) Router
Explanation: A router is a networking device used to connect devices within a LAN and facilitate communication between them.
Question35. Which type of cable is commonly used to connect devices in a LAN?
a) Coaxial cable
b) Fiber optic cable
c) HDMI cable
d) Power cable
Answer: a) Coaxial cable
Explanation: Coaxial cables are often used in LANs to transmit data between devices. They provide a stable and reliable connection.
Data Communication and Computer Network MCQs (Q36- Q40)
Question36. What is the typical range of coverage for a LAN?
a) Several kilometers
b) Hundreds of kilometers
c) Within a few meters
d) Thousands of kilometers
Answer: c) Within a few meters
Explanation: LANs typically cover a small area, such as an office floor or a building, with a range of only a few meters.
Question37. What is the purpose of a switch in a LAN?
a) To connect LANs in different cities
b) To amplify signals in a LAN
c) To manage and forward data between devices in the same LAN
d) To provide wireless access to LAN users
Answer: c) To manage and forward data between devices in the same LAN
Explanation: A switch is a networking device used in LANs to manage network traffic and forward data packets between devices within the same LAN.
Question38. Which network topology is commonly used in LANs?
a) Star topology
b) Ring topology
c) Mesh topology
d) Bus topology
Answer: a) Star topology
Explanation: Star topology is a common network configuration in LANs, where all devices are connected to a central hub or switch.
Question39. What is the term used to describe a LAN that spans multiple buildings in close proximity?
a) Wide Area Network (WAN)
b) Metropolitan Area Network (MAN)
c) Local Area Network (LAN)
d) Campus Area Network (CAN)
Answer: d) Campus Area Network (CAN)
Explanation: A Campus Area Network (CAN) is a type of network that spans multiple buildings within a campus or a similar close-knit area.
Question40. Which protocol is often used in LANs to assign IP addresses dynamically?
a) HTTP
b) SMTP
c) DHCP
d) FTP
Answer: c) DHCP (Dynamic Host Configuration Protocol)
Explanation: DHCP is commonly used in LANs to dynamically assign IP addresses to devices, making it easier to manage IP configurations.
Data Communication and Networking MCQs (Q41- Q45)
Question41. What is a collision in the context of LANs?
a) A type of network protocol
b) A situation where two or more devices transmit data simultaneously, causing data corruption
c) A wireless communication technique
d) A form of network encryption
Answer: b) A situation where two or more devices transmit data simultaneously, causing data corruption
Explanation: Collision occurs in LANs when two or more devices attempt to transmit data at the same time, leading to data corruption and the need for collision detection and resolution mechanisms.
Question42. What is VLAN (Virtual LAN)?
a) A type of physical network connection
b) A network protocol for long-distance communication
c) A logical grouping of devices within a LAN that behave as if they are on separate networks
d) A type of satellite communication
Answer: c) A logical grouping of devices within a LAN that behave as if they are on separate networks
Explanation: VLAN is a technique that allows devices to be logically grouped within a LAN, enabling them to communicate as if they are on separate physical networks.
Question43. What is Ethernet in the context of LANs?
a) A wireless networking standard
b) A type of network topology
c) A family of computer networking technologies for LANs
d) A type of fiber optic cable
Answer: c) A family of computer networking technologies for LANs
Explanation: Ethernet is a set of networking technologies commonly used in LANs for wired communication between devices.
Question44. What is the role of a firewall in a LAN environment?
a) To connect LANs from different locations
b) To manage LAN hardware components
c) To prevent unauthorized access and protect the LAN from external threats
d) To amplify LAN signals
Answer: c) To prevent unauthorized access and protect the LAN from external threats
Explanation: A firewall is a security device that monitors and controls incoming and outgoing traffic to protect the LAN from unauthorized access and cyber threats.
Question45. What is LAN segmentation?
a) A process of dividing LANs into multiple smaller LANs
b) A type of wireless LAN configuration
c) A method to increase the range of LAN coverage
d) A process of connecting LANs over long distances
Answer: a) A process of dividing LANs into multiple smaller LANs
Explanation: LAN segmentation involves dividing a large LAN into smaller segments to improve performance, manage traffic, and enhance network efficiency.