Data Communication MCQs – T4Tutorials.com

What does DNS stand for in the context of networking?
a. Data Network Service
b. Domain Name System
c. Digital Network Security
d. Dynamic Network Service

Answer: b. Domain Name System

Which of the following is a physical layer device?
a. Router
b. Hub
c. Bridge
d. Repeater

Answer: d. Repeater

In networking, what does the term “MAC address” stand for?
a. Media Access Control
b. Message Authentication Code
c. Memory Access Code
d. Modulation and Coding

Answer: a. Media Access Control

Which of the following is not a commonly used network topology?
a. Star
b. Mesh
c. Loop
d. Bus

Answer: c. Loop

What is the purpose of the TCP protocol in the OSI model?
a. Error detection
b. Flow control
c. Data link layer addressing
d. Routing

Answer: b. Flow control

Which of the following is an example of a guided transmission medium?
a. Radio waves
b. Optical fibers
c. Microwave
d. Infrared

Answer: b. Optical fibers

What does the term “bandwidth” refer to in data communication?
a. The speed of data transmission
b. The range of frequencies that can be transmitted
c. The distance between two communicating devices
d. The number of bits transmitted per second

Answer: b. The range of frequencies that can be transmitted

What is the purpose of the ARP protocol?
a. Address Resolution Protocol
b. Automatic Routing Protocol
c. Advanced Routing Protocol
d. Address Recognition Protocol

Answer: a. Address Resolution Protocol

Which of the following is a characteristic of a half-duplex communication system?
a. Simultaneous two-way communication
b. One-way communication
c. Two-way communication with one direction at a time
d. Two-way communication with multiple directions simultaneously

Answer: c. Two-way communication with one direction at a time

What is the function of a firewall in a network?
a. Packet switching
b. Unauthorized access prevention
c. Data encryption
d. IP address assignment

Answer: b. Unauthorized access prevention

What is the purpose of the ICMP protocol?
a. Internet Control Message Protocol
b. Internet Communication Management Protocol
c. Internet Configuration and Monitoring Protocol
d. Internet Connection Management Protocol

Answer: a. Internet Control Message Protocol

Which layer of the OSI model is responsible for end-to-end communication and error recovery?
a. Physical layer
b. Transport layer
c. Network layer
d. Data link layer

Answer: b. Transport layer

Which of the following is an example of a network operating system (NOS)?
a. Windows
b. Linux
c. MacOS
d. All of the above

Answer: d. All of the above

What is the primary purpose of the SSL/TLS protocols?
a. Secure file transfer
b. Secure email communication
c. Secure web communication
d. Secure database access

Answer: c. Secure web communication

What is the purpose of the subnet mask in IP networking?
a. Identifying the network portion of an IP address
b. Assigning IP addresses to devices
c. Resolving domain names to IP addresses
d. Controlling access to the network

Answer: a. Identifying the network portion of an IP address

Which of the following is a characteristic of a switch in a network?
a. Operates at the physical layer
b. Broadcasts data to all connected devices
c. Learns MAC addresses and forwards data selectively
d. Connects multiple networks together

Answer: c. Learns MAC addresses and forwards data selectively

What is the purpose of the DHCP protocol?
a. Dynamic Host Configuration Protocol
b. Domain Host Communication Protocol
c. Distributed Host Configuration Protocol
d. Data Hub Control Protocol

Answer: a. Dynamic Host Configuration Protocol

Which of the following is an example of a wireless communication medium?
a. Twisted pair
b. Coaxial cable
c. Infrared
d. Fiber optics

Answer: c. Infrared

What is the role of a gateway in a network?
a. Connects two networks with different communication protocols
b. Manages IP address assignments
c. Controls access to a local network
d. Performs error detection and correction

Answer: a. Connects two networks with different communication protocols

Which layer of the OSI model is responsible for logical addressing and routing?
a. Data link layer
b. Transport layer
c. Network layer
d. Application layer

Answer: c. Network layer

What is the purpose of a modem in data communication?
a. Modulation and Demodulation
b. Multiplexing and Demultiplexing
c. Medium Access Control
d. Message Authentication Code

Answer: a. Modulation and Demodulation

What is the significance of the HTTP protocol in web communication?
a. Hypertext Transport Protocol
b. Hyperlink Transmission Protocol
c. Hypertext Transfer Protocol
d. Hypermedia Transport Protocol

Answer: c. Hypertext Transfer Protocol

Which of the following is a reliable transport layer protocol?
a. UDP (User Datagram Protocol)
b. TCP (Transmission Control Protocol)
c. ICMP (Internet Control Message Protocol)
d. IP (Internet Protocol)

Answer: b. TCP (Transmission Control Protocol)

What is the purpose of the CRC (Cyclic Redundancy Check) in data communication?
a. Error detection
b. Flow control
c. Address resolution
d. Encryption

Answer: a. Error detection

Which of the following is a disadvantage of using a hub in a network?
a. Collision detection
b. Broadcasts data to all connected devices
c. Operates at the data link layer
d. Provides network segmentation

Answer: b. Broadcasts data to all connected devices

What is the function of a router in a network?
a. Connects multiple networks together
b. Connects devices within a local network
c. Manages IP address assignments
d. Forwards data based on MAC addresses

Answer: a. Connects multiple networks together

What does the term “latency” refer to in data communication?
a. Transmission delay
b. Propagation delay
c. Processing delay
d. All of the above

Answer: d. All of the above

Which of the following is a common protocol used for secure email communication?
a. SMTP (Simple Mail Transfer Protocol)
b. POP3 (Post Office Protocol 3)
c. IMAP (Internet Message Access Protocol)
d. HTTPS (Hypertext Transfer Protocol Secure)

Answer: d. HTTPS (Hypertext Transfer Protocol Secure)

What is the purpose of NAT (Network Address Translation) in networking?
a. Assigns unique IP addresses to devices
b. Translates private IP addresses to public IP addresses
c. Manages DNS resolution
d. Implements encryption for data security

Answer: b. Translates private IP addresses to public IP addresses

Which of the following is a characteristic of a full-duplex communication system?
a. One-way communication
b. Simultaneous two-way communication
c. Two-way communication with one direction at a time
d. Two-way communication with multiple directions simultaneously

Answer: b. Simultaneous two-way communication

What is the purpose of the OSI model in networking?
a. Defines the architecture for computer networks
b. Provides a framework for understanding and designing networks
c. Specifies the rules for data communication
d. All of the above

Answer: d. All of the above

What is the function of a proxy server in a network?
a. Filters and controls access to the internet
b. Assigns IP addresses dynamically
c. Forwards data based on MAC addresses
d. Detects and corrects errors in data transmission

Answer: a. Filters and controls access to the internet

What does the term “protocol” refer to in data communication?
a. A set of rules for communication
b. A hardware device for data transmission
c. A type of network topology
d. An encryption algorithm

Answer: a. A set of rules for communication

Which of the following is an example of an application layer protocol?
a. FTP (File Transfer Protocol)
b. TCP (Transmission Control Protocol)
c. ICMP (Internet Control Message Protocol)
d. IP (Internet Protocol)

Answer: a. FTP (File Transfer Protocol)

In the context of networking, what does the term “DNS resolution” mean?
a. Detecting network speed
b. Converting domain names to IP addresses
c. Determining network topology
d. Allocating IP addresses dynamically

Answer: b. Converting domain names to IP addresses

What is the purpose of the VLAN (Virtual Local Area Network) in networking?
a. Segments a physical network into multiple logical networks
b. Manages IP address assignments
c. Facilitates wireless communication
d. Filters and controls internet access

Answer: a. Segments a physical network into multiple logical networks

Which of the following is a characteristic of a point-to-point communication link?
a. Connects multiple devices in a network
b. Provides a dedicated link between two devices
c. Operates in a broadcast mode
d. Supports multiple simultaneous transmissions

Answer: b. Provides a dedicated link between two devices

What is the purpose of the UDP protocol in networking?
a. Reliable data transmission
b. Connection establishment
c. Error detection and correction
d. Fast and lightweight data transmission

Answer: d. Fast and lightweight data transmission

What is the significance of the 802.11 standard in wireless networking?
a. Ethernet standard
b. Bluetooth standard
c. Wi-Fi standard
d. USB standard

Answer: c. Wi-Fi standard

What is the primary function of a bridge in a network?
a. Connects multiple networks together
b. Filters and forwards data based on MAC addresses
c. Manages IP address assignments
d. Provides access control to a local network

Answer: b. Filters and forwards data based on MAC addresses

Which of the following is a characteristic of a star topology?
a. Redundancy and fault tolerance
b. Each device is connected to a central hub
c. Ring-like structure with nodes connected sequentially
d. Meshed connections between all devices

Answer: b. Each device is connected to a central hub

What does the term “collision domain” refer to in networking?
a. Area where data collisions occur
b. Group of devices that can communicate without collisions
c. Time interval during which collisions are detected
d. Network segment with a dedicated channel for communication

Answer: a. Area where data collisions occur

What is the purpose of the SMTP protocol in email communication?
a. Simple Mail Transfer Protocol
b. Secure Mail Transmission Protocol
c. Server Message Transfer Protocol
d. Simple Message Transfer Protocol

Answer: a. Simple Mail Transfer Protocol

In networking, what is the role of a repeater?
a. Connects multiple networks together
b. Amplifies and retransmits signals over long distances
c. Filters and forwards data based on MAC addresses
d. Assigns IP addresses dynamically

Answer: b. Amplifies and retransmits signals over long distances

What is the purpose of the POP3 protocol in email communication?
a. Post Office Protocol 3
b. Point-to-Point Protocol
c. Public Online Protocol
d. Peripheral Operations Protocol

Answer: a. Post Office Protocol 3

Which of the following is an example of a non-volatile storage device?
a. RAM (Random Access Memory)
b. Hard disk drive
c. Cache memory
d. Optical disc

Answer: b. Hard disk drive

What is the significance of the OSI model’s seven layers?
a. They represent the seven fundamental protocols
b. They provide a conceptual framework for network communication
c. They define the seven types of network topologies
d. They specify the seven steps of data encryption

Answer: b. They provide a conceptual framework for network communication

What is the function of a firewall in the context of computer security?
a. Protects against unauthorized access and attacks
b. Regulates power consumption
c. Manages IP address assignments
d. Optimizes data transmission speed

Answer: a. Protects against unauthorized access and attacks

What is the purpose of the HTTP protocol in web communication?
a. Hypertext Transfer Protocol
b. Hypertext Transmission Protocol
c. Hyperlink Transport Protocol
d. Hypermedia Transfer Protocol

Answer: a. Hypertext Transfer Protocol

What is the role of a switch in a network?
a. Filters and controls internet access
b. Connects multiple networks together
c. Learns MAC addresses and forwards data selectively
d. Provides a dedicated link between two devices

Answer: c. Learns MAC addresses and forwards data selectively

Networking MCQs

Data Communication MCQs
By: Prof. Dr. Fazal Rehman Shamil | Last updated: February 20, 2024

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