Q#1: What is the main purpose of data communication?
(A) To store data permanently
(B) To transfer data from one place to another
(C) To compress data
(D) To encrypt data
Answer: (B) To transfer data from one place to another
Q#2: Which of the following is not a component of data communication?
(A) Sender
(B) Receiver
(C) Protocol
(D) Compiler
Answer: (D) Compiler
Q#3: What is a protocol in data communication?
(A) A type of hardware device
(B) A set of rules for communication
(C) A storage method
(D) A programming language
Answer: (B) A set of rules for communication
Q#4: Data can be classified into:
(A) Digital only
(B) Analog only
(C) Digital and Analog
(D) None of the above
Answer: (C) Digital and Analog
Q#5: Which of these is an example of analog data?
(A) Text file
(B) Audio from a microphone
(C) Video stored in MP4
(D) Binary code
Answer: (B) Audio from a microphone
Q#6: Which of these is an example of digital data?
(A) Voice signal
(B) Temperature readings in digital form
(C) Analog TV broadcast
(D) Radio waves
Answer: (B) Temperature readings in digital form
Q#7: The term bandwidth refers to:
(A) Amount of data that can be transmitted per second
(B) Size of the storage device
(C) Power of a signal
(D) Distance between sender and receiver
Answer: (A) Amount of data that can be transmitted per second
Q#8: Which is a simplex communication?
(A) Keyboard to CPU
(B) CPU to monitor
(C) Walkie-talkie in talk mode
(D) Telephone call
Answer: (A) Keyboard to CPU
Q#9: Which is an example of half-duplex communication?
(A) Telephone
(B) Walkie-talkie
(C) Keyboard
(D) Monitor
Answer: (B) Walkie-talkie
Q#10: Which is an example of full-duplex communication?
(A) Walkie-talkie
(B) Fax machine
(C) Telephone call
(D) Keyboard
Answer: (C) Telephone call
Q#11: A network is defined as:
(A) A collection of computers without connectivity
(B) Two or more connected devices for sharing resources
(C) A type of software
(D) A programming language
Answer: (B) Two or more connected devices for sharing resources
Q#12: Which of the following is not a network type?
(A) LAN
(B) MAN
(C) WAN
(D) PANDA
Answer: (D) PANDA
Q#13: LAN stands for:
(A) Large Area Network
(B) Local Area Network
(C) Long Access Network
(D) Low Area Network
Answer: (B) Local Area Network
Q#14: WAN stands for:
(A) Wide Area Network
(B) Wireless Area Network
(C) Wide Access Network
(D) Wired Area Network
Answer: (A) Wide Area Network
Q#15: MAN stands for:
(A) Medium Area Network
(B) Metropolitan Area Network
(C) Multiple Access Network
(D) Main Area Network
Answer: (B) Metropolitan Area Network
Q#16: Which network type covers a small geographical area?
(A) LAN
(B) MAN
(C) WAN
(D) Internet
Answer: (A) LAN
Q#17: Which network type covers a city or town?
(A) LAN
(B) MAN
(C) WAN
(D) PAN
Answer: (B) MAN
Q#18: Which network type covers a country or multiple countries?
(A) LAN
(B) MAN
(C) WAN
(D) CAN
Answer: (C) WAN
Q#19: Packet switching is:
(A) Sending data in large continuous streams
(B) Sending data in small packets
(C) Storing data on hard drives
(D) Encrypting data
Answer: (B) Sending data in small packets
Q#20: Circuit switching is:
(A) Sending data in small packets
(B) Establishing a dedicated path for communication
(C) Using multiple protocols
(D) Wireless transmission only
Answer: (B) Establishing a dedicated path for communication
Q#21: The internet is a network of:
(A) LANs only
(B) WANs only
(C) Networks of networks
(D) Single computers
Answer: (C) Networks of networks
Q#22: Intranet is:
(A) A private network within an organization
(B) A public network
(C) The same as Internet
(D) Wireless only
Answer: (A) A private network within an organization
Q#23: Extranet is:
(A) A public network
(B) An internal private network shared with partners
(C) Wireless LAN
(D) Only for email
Answer: (B) An internal private network shared with partners
Q#24: Transmission medium refers to:
(A) The device that stores data
(B) The physical path for data transmission
(C) Protocol for sending data
(D) Error detection method
Answer: (B) The physical path for data transmission
Q#25: Guided media includes:
(A) Radio waves
(B) Fiber optics, twisted pair, coaxial cable
(C) Microwaves
(D) Satellite signals
Answer: (B) Fiber optics, twisted pair, coaxial cable
Q#26: Unguided media includes:
(A) Fiber optics
(B) Twisted pair
(C) Radio waves, microwaves, infrared
(D) Coaxial cable
Answer: (C) Radio waves, microwaves, infrared
Q#27: Bit rate is:
(A) Number of bits transmitted per second
(B) Number of bytes transmitted per minute
(C) Signal power
(D) Bandwidth only
Answer: (A) Number of bits transmitted per second
Q#28: Baud rate is:
(A) Number of signal changes per second
(B) Number of bits transmitted per second
(C) Size of a packet
(D) Network delay
Answer: (A) Number of signal changes per second
Q#29: Simplex transmission allows data to flow:
(A) In both directions simultaneously
(B) In both directions alternately
(C) In one direction only
(D) Randomly
Answer: (C) In one direction only
Q#30: Half-duplex transmission allows data to flow:
(A) Only in one direction
(B) Both directions alternately
(C) Both directions simultaneously
(D) None of the above
Answer: (B) Both directions alternately
Q#31: Full-duplex transmission allows data to flow:
(A) In one direction
(B) Both directions alternately
(C) Both directions simultaneously
(D) Randomly
Answer: (C) Both directions simultaneously
Q#32: Which of the following is a network device?
(A) Modem
(B) Hub
(C) Switch
(D) All of the above
Answer: (D) All of the above
Q#33: Switch operates at which OSI layer?
(A) Physical
(B) Data Link
(C) Network
(D) Application
Answer: (B) Data Link
Q#34: Hub operates at which OSI layer?
(A) Physical
(B) Data Link
(C) Network
(D) Transport
Answer: (A) Physical
Q#35: Router operates at which OSI layer?
(A) Data Link
(B) Network
(C) Transport
(D) Physical
Answer: (B) Network
Q#36: Repeater is used to:
(A) Increase signal strength
(B) Encrypt data
(C) Compress data
(D) Switch packets
Answer: (A) Increase signal strength
Q#37: Network topology refers to:
(A) Physical or logical layout of devices
(B) Type of cable
(C) Protocol used
(D) Software used
Answer: (A) Physical or logical layout of devices
Q#38: Bus topology uses:
(A) Single backbone cable
(B) Ring of devices
(C) Star connections
(D) Mesh connections
Answer: (A) Single backbone cable
Q#39: Star topology uses:
(A) Single cable
(B) Hub or switch connecting all devices
(C) Ring of devices
(D) Mesh connections
Answer: (B) Hub or switch connecting all devices
Q#40: Ring topology uses:
(A) Hub
(B) Bus
(C) Closed loop connecting all devices
(D) Mesh
Answer: (C) Closed loop connecting all devices
Q#41: Mesh topology is:
(A) All devices connected to a central hub
(B) All devices connected directly to each other
(C) Devices connected in a line
(D) Devices connected in a circle
Answer: (B) All devices connected directly to each other
Q#42: Latency refers to:
(A) Time taken for data to travel from source to destination
(B) Speed of CPU
(C) Storage capacity
(D) Number of devices
Answer: (A) Time taken for data to travel from source to destination
Q#43: Throughput refers to:
(A) Maximum data rate that can be transmitted
(B) Actual data transmitted per unit time
(C) Delay in transmission
(D) Number of nodes
Answer: (B) Actual data transmitted per unit time
Q#44: Error detection ensures:
(A) Data compression
(B) Detecting errors during transmission
(C) Faster transmission
(D) Encryption
Answer: (B) Detecting errors during transmission
Q#45: Error correction ensures:
(A) Data deletion
(B) Correcting errors automatically
(C) Signal boosting
(D) Reducing latency
Answer: (B) Correcting errors automatically
Q#46: Synchronous transmission sends data:
(A) One bit at a time without clock
(B) In a continuous stream synchronized with a clock
(C) Randomly
(D) Only in simplex
Answer: (B) In a continuous stream synchronized with a clock
Q#47: Asynchronous transmission sends data:
(A) With start and stop bits
(B) Continuously
(C) Only in digital signals
(D) Only in analog signals
Answer: (A) With start and stop bits
Q#48: Multiplexing is used to:
(A) Increase number of users using the same medium
(B) Encrypt data
(C) Compress data
(D) Store data
Answer: (A) Increase number of users using the same medium
Q#49: Time Division Multiplexing (TDM) divides medium by:
(A) Frequency
(B) Time
(C) Space
(D) Code
Answer: (B) Time
Q#50: Frequency Division Multiplexing (FDM) divides medium by:
(A) Time
(B) Frequency
(C) Code
(D) Space
Answer: (B) Frequency