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Which transmission mode allows data to be sent in only one direction and never in the opposite direction?
a. Simplex
b. Half Duplex
c. Full Duplex
d. Duplex
Answer: a. Simplextestbook
What is the name of the mode where data can be transmitted in both directions, but not at the same time?
a. Half Duplex
b. Full Duplex
c. Simplex
d. Singleplex
Answer: a. Half Duplextestbook
Which channel type allows simultaneous two-way communication?
a. Full Duplex
b. Half Duplex
c. Simplex
d. Unidirectional
Answer: a. Full Duplextestbook
In a broadcast network, how is the communication channel shared?
a. Among all the devices
b. Between only two devices
c. In a round-robin manner
d. Not shared
Answer: a. Among all the devicesuninets
What is the main purpose of multiplexing in communication channels?
a. Sharing a single channel among multiple signals
b. Restricting access to network media
c. Encrypting traffic
d. Error detection
Answer: a. Sharing a single channel among multiple signalssanfoundry
In which network topology do all devices share a single communication line or cable?
a. Bus
b. Star
c. Mesh
d. Ring
Answer: a. Busuninets
Which type of channel is used in satellite communication?
a. Wireless
b. Copper cable
c. Fiber optic
d. Coaxial cable
Answer: a. Wirelessexamradar
Which physical layer device can divide a single communication channel into multiple logical channels?
a. Multiplexer
b. Repeater
c. Switch
d. Modem
Answer: a. Multiplexersanfoundry
Which of the following is an example of a guided communication channel?
a. Twisted pair cable
b. Radio waves
c. Microwaves
d. Infrared waves
Answer: a. Twisted pair cableexamradar
What is the function of channel partitioning?
a. To allocate dedicated portions of a channel to each user
b. To improve signal noise ratio
c. To convert digital to analog signal
d. To amplify signals
Answer: a. To allocate dedicated portions of a channel to each usersanfoundry
Which common technique allows multiple communication channels in wireless networks through different frequencies?
a. Frequency Division Multiplexing (FDM)
b. Time Division Multiplexing (TDM)
c. Statistical Multiplexing
d. Wavelength Division Multiplexing (WDM)
Answer: a. Frequency Division Multiplexing (FDM)sanfoundry
Which wireless communication channel uses frequencies below 2 MHz for propagation?
a. Ground propagation
b. Sky propagation
c. Line-of-sight propagation
d. Direct propagation
Answer: a. Ground propagationexamradar
What type of communication channel do fiber optic cables represent?
a. Guided channel
b. Unguided channel
c. Coaxial channel
d. Satellite channel
Answer: a. Guided channelexamradar
In a telephone network using FDD, how many simplex channels make up a full-duplex channel?
a. 2
b. 4
c. 1
d. 3
Answer: a. 2testbook+1
Which of the following is not an unguided communication channel?
a. Optical fiber
b. Microwave
c. Infrared
d. Radio wave
Answer: a. Optical fiberexamradar
In TDM networks, how is a single channel divided?
a. By time slots
b. By frequency bandwidths
c. By signal amplitudes
d. By protocols
Answer: a. By time slotssanfoundry
What is a practical example of a full duplex channel?
a. Telephone network
b. Radio broadcast
c. Television signal
d. Satellite downlink only
Answer: a. Telephone networktestbook
Which term is used for the total capacity of a communication channel to carry information?
a. Bandwidth
b. Throughput
c. Frequency
d. Amplitude
Answer: a. Bandwidthreck
What type of channel connects devices within a LAN physically?
a. Wired channel
b. Wireless channel
c. Satellite channel
d. Light channel
Answer: a. Wired channelexamradar
Which channel is mainly responsible for long-distance global communication?
a. Satellite channel
b. Twisted pair channel
c. Coaxial channel
d. Bus channel
Answer: a. Satellite channelexamradar
What is the result of channel noise on data communication?
a. Loss of data integrity
b. Increased bandwidth
c. Decreased latency
d. Higher signal frequency
Answer: a. Loss of data integritysanfoundry
What is the function of a channel encoder in a digital communication system?
a. Adds redundancy to detect and correct errors
b. Deletes unnecessary data
c. Converts analog to digital
d. Increases propagation distance
Answer: a. Adds redundancy to detect and correct errorssanfoundry
Which channel type provides the highest immunity to electromagnetic interference?
a. Optical fiber channel
b. Twisted pair channel
c. Coaxial channel
d. Wireless channel
Answer: a. Optical fiber channelexamradar
What does “simplex operation” in computer networks mean?
a. Data can be sent in only one direction
b. Data can be sent in both directions, but alternately
c. Data channel can be shared among users
d. Multiple channels combined as one
Answer: a. Data can be sent in only one directiontestbook
Which method is used for sharing the same channel medium among multiple users in cellular networks?
a. Frequency reuse
b. Channel splitting
c. Broadcast scheduling
d. Signal hopping
Answer: a. Frequency reusetestbook
What’s the key property of an unguided communication channel?
a. Media is not enclosed
b. Only digital signals transmitted
c. High latency by default
d. Supports only simplex operation
Answer: a. Media is not enclosedexamradar
The portion of a network where data is transmitted as electromagnetic waves through air refers to:
a. Wireless channel
b. Wired channel
c. Guided channel
d. Copper channel
Answer: a. Wireless channelexamradar
Which is a major limitation of using a single shared communication channel?
a. Collisions increase with multiple users
b. Bandwidth is doubled
c. Noise is eliminated
d. Latency is always zero
Answer: a. Collisions increase with multiple userssanfoundry
In a typical communication channel, which parameter is used to measure its error handling ability?
a. Bit Error Rate (BER)
b. Bandwidth
c. Latency
d. Modulation
Answer: a. Bit Error Rate (BER)sanfoundry
For what purpose is Code Division Multiple Access (CDMA) used?
a. Multiple users share a common channel with different codes
b. Increasing cable length
c. Encrypting channel content
d. Reducing modulation rate
Answer: a. Multiple users share a common channel with different codessanfoundry
Which channel is most suitable for data transmission in high-interference environments?
a. Optical fiber
b. Unshielded twisted pair
c. Radio frequency wireless
d. Coaxial cable
Answer: a. Optical fiberexamradar
The theoretical upper limit of data rate in a noisy channel is determined by:
a. Shannon capacity
b. Hamming Code
c. Reed-Solomon rate
d. Nyquist rate
Answer: a. Shannon capacitystudocu
A communication channel that supports data transmission in both directions, but not simultaneously, is called:
a. Half Duplex
b. Full Duplex
c. Simplex
d. Reversible
Answer: a. Half Duplextestbook
In a frequency reuse system, what factor is crucial in minimizing interference among channels?
a. Geographic spacing of cells using the same frequency
b. Cable shielding thickness
c. Modulation index
d. Network topology
Answer: a. Geographic spacing of cells using the same frequencytestbook
Which is a characteristic of a point-to-point channel?
a. Connects only two devices directly
b. Shares the channel among all devices
c. Always wireless
d. Makes use of satellites
Answer: a. Connects only two devices directlysanfoundry
What is an ‘uplink channel’ in satellite communication?
a. Channel from ground station to satellite
b. Channel from satellite to ground station
c. Channel between two satellites
d. Channel for encryption
Answer: a. Channel from ground station to satelliteexamradar
For which reason is channel bandwidth an important metric?
a. Determines data transfer capacity
b. Sets network topology
c. Increases cable lifespan
d. Controls device authentication
Answer: a. Determines data transfer capacityreck
What does ‘latency’ in relation to communication channels represent?
a. Time taken for data to travel from source to destination
b. Number of communication frequencies
c. Bandwidth of the channel
d. Size of transmitted packet
Answer: a. Time taken for data to travel from source to destinationsanfoundry
A typical use of a ‘downlink channel’ is:
a. Satellite-to-ground communication
b. Server-to-server VPN tunneling
c. Wired LAN transfer
d. Digital circuit switching
Answer: a. Satellite-to-ground communicationexamradar
An omnidirectional antenna is essential for which channel type?
a. Broadcast wireless channel
b. Fiber optic channel
c. Point-to-point wired channel
d. Shielded copper channel
Answer: a. Broadcast wireless channelexamradar
Which protocol provides logical channels for different processes within a host?
a. TCP
b. UDP
c. ICMP
d. ARP
Answer: a. TCPsanfoundry
A channel that is always available but only used when needed is:
a. Virtual channel
b. Physical channel
c. Guided channel
d. Shared channel
Answer: a. Virtual channelsanfoundry
What is the term for the physical medium through which data travels in a channel?
a. Transmission media
b. Protocol stack
c. Routing table
d. Multiplex table
Answer: a. Transmission mediaexamradar
Which channel characteristic can be increased by signal amplification but is limited by noise?
a. Channel capacity
b. Modulation bandwidth
c. Delay bandwidth
d. Frequency spread
Answer: a. Channel capacitystudocu
What is the difference between simplex and duplex communication channels?
a. Simplex: one-way; Duplex: two-way
b. Simplex: many-to-many; Duplex: one-to-many
c. Simplex: only analog; Duplex: only digital
d. Simplex: very high speed; Duplex: only slow channels
Answer: a. Simplex: one-way; Duplex: two-waytestbook
In time division multiplexing, what happens if no data needs to be sent in a time slot?
a. Slot is left empty or filled with idle bits
b. Frame is terminated
c. Signal is sent at a lower frequency
d. Slot is recalculated
Answer: a. Slot is left empty or filled with idle bitssanfoundry
What is referred to as ‘channel access method’?
a. Technique to control how devices share communication channels
b. Algorithm for encrypting channel data
c. Strategy for increasing fiber core count
d. Method for routing IP packets
Answer: a. Technique to control how devices share communication channelssanfoundry
Which of these is NOT a valid physical communication channel?
a. Cloud process channel
b. Twisted pair cable
c. Coaxial cable
d. Fiber optic cable
Answer: a. Cloud process channelexamradar
The concept of ‘logical channels’ in networking is often associated with:
a. Virtual circuits within a physical channel
b. Cable length
c. Frequency gain
d. Time constant
Answer: a. Virtual circuits within a physical channelsanfoundry
In wireless channels, which phenomenon can cause multipath interference?
a. Signal reflection and refraction
b. Signal encryption
c. Single-frequency usage
d. Signal compression
Answer: a. Signal reflection and refractionexamradar

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