Which of the following are the types of basic protocols that are present in multiple access control in data link layer?

• A. Random, controlled, channelization
• B. Controlled, channelization
• C. Random, channelization
• D. Random, controlled, contributed

Which aspect of the random-access protocols makes them contention methods?

• A. No rules for accessing medium
• B. Shared bandwidth
• C. Authorized access for medium
• D. Scheduling time for medium

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.