Q1: In a _connection, more than two devices can share a single link.
(A) Point-to-point
(B) Primary
(C) Multipoint
(D) Secondary
Answer: (C) Multipoint
Q2: Communication between a computer and a keyboard involves _ transmission.
(A) Full-duplex
(B) Half-duplex
(C) Simplex
(D) Automatic
Answer: (C) Simplex
Q3: In a network with 25 computers, which topology requires the most cabling?
(A) Star
(B) Mesh
(C) Bus
(D) Ring
Answer: (B) Mesh
Q4: Which topology requires a central controller or hub?
(A) Star
(B) Mesh
(C) Bus
(D) Ring
Answer: (A) Star
Q5: The is the physical path over which a message travels.
(A) Protocol
(B) Medium
(C) Signal
(D) All of the above
Answer: (B) Medium
Q6: Which organization has authority over interstate and international communication in the United States?
(A) ITU-T
(B) IEEE
(C) ISO
(D) FCC
Answer: (D) FCC
Q7: The information to be communicated in a data communication system is the ______.
(A) Medium
(B) Protocol
(C) Transmission
(D) Message
Answer: (D) Message
Q8: Frequency of failure and network recovery time are measures of the ______ of a network.
(A) Performance
(B) Security
(C) Reliability
(D) Feasibility
Answer: (C) Reliability
Q9: In ______ transmission, the channel capacity is shared by both communicating devices at the same time.
(A) Full-duplex
(B) Simplex
(C) Half-duplex
(D) Half-simplex
Answer: (A) Full-duplex
Q10: An unauthorized user is a network _ issue.
(A) Performance
(B) Reliability
(C) Security
(D) All of the above
Answer: (C) Security
Q11: Which topology requires a multipoint connection?
(A) Mesh
(B) Star
(C) Ring
(D) Bus
Answer: (D) Bus
Q12: A television broadcast is an example of transmission.
(A) Half-duplex
(B) Full-duplex
(C) Simplex
(D) Automatic
Answer: (C) Simplex
Q13: A connection provides a dedicated link between two devices.
(A) Multipoint
(B) Point-to-point
(C) Primary
(D) Secondary
Answer: (B) Point-to-point
Q14: A cable break in a topology stops all transmission.
(A) Mesh
(B) Star
(C) Primary
(D) Bus
Answer: (D) Bus
Q15: The _layer changes bits into electromagnetic signals.
(A) Physical
(B) Transport
(C) Network
(D) Data link
Answer: (A) Physical
Q16: The physical layer is concerned with transmission of __over the medium.
(A) Programs
(B) Protocols
(C) Bits
(D) Dialogs
Answer: (C) Bits
Q17: Mail services are available to network users through the layer.
(A) Data link
(B) Physical
(C) Application
(D) Transport
Answer: (C) Application
Q18: As a data packet moves from lower to upper layers, headers are ______.
(A) Added
(B) Rearranged
(C) Modified
(D) Removed
Answer: (D) Removed
Q19: As a data packet moves from upper to lower layers, headers are ______.
(A) Removed
(B) Added
(C) Rearranged
(D) Modified
Answer: (B) Added
Q20: The ______ layer lies between the network layer and the application layer.
(A) Data link
(B) Physical
(C) Transport
(D) Session
Answer: (C) Transport
Q21: Layer 2 lies between the physical layer and the_ layer.
(A) Data link
(B) Network
(C) Transport
(D) Application
Answer: (B) Network
Q22: When data move from device A to device B, the header from A’s layer 4 is read by B’s _ layer.
(A) Application
(B) Physical
(C) Transport
(D) Network
Answer: (C) Transport
Q23: Which layer acts as a liaison between user support layers and network support layers?
(A) Network layer
(B) Transport layer
(C) Physical layer
(D) Application layer
Answer: (B) Transport layer
Q24: The main function of the transport layer is ______.
(A) Process-to-process delivery
(B) Node-to-node delivery
(C) Synchronization
(D) Routing table update
Answer: (A) Process-to-process delivery
Q25: Which of the following is an application layer service?
(A) Remote log-in
(B) File transfer
(C) Mail service
(D) All of the above
Answer: (D) All of the above
Q26: The Internet model consists of layers.
(A) Three
(B) Five
(C) Seven
(D) Eight
Answer: (B) Five
Q27: Process-to-process delivery of a message is the responsibility of the layer.
(A) Physical
(B) Network
(C) Transport
(D) Application
Answer: (C) Transport
Q28: The ______ layer is closest to the transmission medium.
(A) Network
(B) Physical
(C) Data link
(D) Transport
Answer: (B) Physical
Q29: Before data can be transmitted, they must be transformed into ______.
(A) Electromagnetic signals
(B) Periodic signals
(C) Aperiodic signals
(D) Low-frequency waves
Answer: (A) Electromagnetic signals
Q30: When one component of a signal has zero frequency, the average amplitude of the signal ______.
(A) Is less than zero
(B) Is greater than zero
(C) Is zero
(D) Either less or greater than zero
Answer: (B) Is greater than zero
Q31: A periodic signal can always be decomposed into ______.
(A) Odd number of sine waves
(B) Sine waves with phase zero
(C) A set of sine waves
(D) None of these
Answer: (C) A set of sine waves
Q32: A periodic signal completes one cycle in 0.001 seconds. What is its frequency?
(A) 1 Hz
(B) 100 Hz
(C) 1 KHz
(D) 1 MHz
Answer: (C) 1 KHz
Q33: In a frequency-domain plot, the horizontal axis represents ______.
(A) Frequency
(B) Peak amplitude
(C) Phase
(D) Slope
Answer: (A) Frequency
Q34: In a time-domain plot, the vertical axis represents ______.
(A) Frequency
(B) Phase
(C) Amplitude
(D) Time
Answer: (C) Amplitude
Q35: In a time-domain plot, the horizontal axis represents ______.
(A) Signal amplitude
(B) Time
(C) Frequency
(D) Phase
Answer: (B) Time
Q36: If bandwidth is 5 KHz and the lowest frequency is 52 KHz, the highest frequency is ______.
(A) 5 KHz
(B) 10 KHz
(C) 47 KHz
(D) 57 KHz
Answer: (D) 57 KHz
Q37: As frequency increases, the period ______.
(A) Decreases
(B) Increases
(C) Remains same
(D) Doubles
Answer: (A) Decreases
Q38: Bandwidth of a signal from 40 KHz to 4 MHz is ______.
(A) 3.96 MHz
(B) 36 MHz
(C) 360 KHz
(D) 396 KHz
Answer: (A) 3.96 MHz
Q39: When propagation speed is multiplied by propagation time, we get the ______.
(A) Throughput
(B) Wavelength
(C) Distance travelled
(D) Distortion factor
Answer: (C) Distance travelled
Q40: Loss of signal strength due to resistance of medium is called ______.
(A) Distortion
(B) Noise
(C) Decibel
(D) Attenuation
Answer: (D) Attenuation