System Administrator 2026
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Why station need to wait random amount of time for re-transmission of the frame after collision in pure aloha?
  • A. To prevent other stations
  • B. To avoid more collisions
  • C. To detect other collisions
  • D. To get acknowledgment from the receiver
Which strategy is used by the pure aloha to prevent the congestion caused by continuous re-transmitted frames?
  • A. Aborts the re-transmission after 5 attempts
  • B. A station is allowed to re-transmit for 2 times
  • C. Restriction on the attempts for re-transmission
  • D. Re-transmission has no restriction
What is the vulnerable time of the pure aloha for fixed length of frames (T=frame time)?
  • A. 2*t
  • B. 3*t
  • C. 1/2*t
  • D. 5*t
Which of the following controlled access protocol is known as master slave method?
  • A. Polling
  • B. Reservation
  • C. Token passing
  • D. Scheduling
Which of the following type of multiple access protocols uses a scheme called “Authorization from other stations”?
  • A. Random access protocol
  • B. Controlled access protocol
  • C. Channelization
  • D. Persistent method
Which of the following persistent method of random-access protocol reduces the collisions and efficiency of the network?
  • A. 1 €? persistent
  • B. Non persistent
  • C. Persistent
  • D. 1 €? persistent and non-persistent
What is the vulnerable time in carrier sense multiple access?
  • A. T propagation
  • B. T frame
  • C. 2*t frame
  • D. 2*t propagation
Slotted aloha has vulnerable time that is half of the vulnerable time of pure aloha.
  • A. True
  • B. False
  • C.
  • D.
Which of the following is not a channelization protocol?
  • A. Frequency division multiple access
  • B. Time division multiple access
  • C. Code division multiple access
  • D. Bandwidth division multiple access
What technique is used by the TDMA to accomplish synchronization?
  • A. Preamble bits
  • B. Synchronization bytes
  • C. Guard bits
  • D. Start points
Word of the Day
18 Jun
Betray
expose (one’s country, a group, or a person) to danger by treacherously giving information to an enemy.
دغا دینا، غداری کرنا، ساتھ چھوڑنا

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