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MCQs

Total Questions : 885 | Page 42 of 89 pages
Question 411. Which of the following data transmission media has the largest terrestrial range without the use of repeaters or other devices?
  1.    Laser
  2.    Hardwiring
  3.    Microwave
  4.    Satellite
  5.    None of these
 Discuss Question
Answer: Option D. -> Satellite
Question 412. The area of coverage of a satellite radio beam is known as
  1.    Identity
  2.    Beam width
  3.    Footprint
  4.    Circular polarization
  5.    None of these
 Discuss Question
Answer: Option C. -> Footprint
Question 413. What is the minimum number of wires needed to send data over a serial communication link layer?
  1.    None of these
  2.    4
  3.    2
  4.    6
  5.    1
 Discuss Question
Answer: Option C. -> 2
Question 414. Bulletin board system
  1.    None of these
  2.    is a modem capable of accepting commands
  3.    converts digital signals to analog signals
  4.    is a public access message system
  5.    converts analog signals to digital signals
 Discuss Question
Answer: Option D. -> is a public access message system
Question 415. Ethernet networks can be cabled in a number of topologies, depending on what works best in each environment. As more nodes are added, the efficiency of Ethernet decreases. Select the best answer as to why Ethernet becomes less efficient as size increases.
  1.    Repeaters cannot increase the signal strength sufficiently
  2.    Cable terminators do not reflect the signal properly
  3.    "Line echo" occurs due to the impedance of the cable
  4.    Cable terminators do not absorb the signal properly
  5.    Network collisions occur
 Discuss Question
Answer: Option E. -> Network collisions occur
Question 416. What is the name of the device that connects two computers by means of a telephone line?
  1.    None of these
  2.    bus
  3.    cable
  4.    Tape
  5.    modem
 Discuss Question
Answer: Option E. -> modem
Question 417. The _____ layer is the layer closest to the transmission medium.
  1.    None of these
  2.    data link
  3.    physical
  4.    transport
  5.    network
 Discuss Question
Answer: Option C. -> physical
Question 418. On a class B network, how many subnets are available with a subnet mask of 248?
  1.    6
  2.    2
  3.    62
  4.    30
  5.    126
 Discuss Question
Answer: Option D. -> 30
Question 419. What is the main difference between DDCMP and SDLG?
  1.    SDLC does not use CRC
  2.    SDLC has a IP address
  3.    DDCMP does not need special hardware to final the beginning of a message.
  4.    None of these
  5.    DDCMP has a message header
 Discuss Question
Answer: Option C. -> DDCMP does not need special hardware to final the beginning of a message.
Question 420. In a _____ topology, if there are n devices in a network, each device has n - 1 ports for cables.
  1.    None of these
  2.    mesh
  3.    bus
  4.    star
  5.    ring
 Discuss Question
Answer: Option B. -> mesh

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