DATA LINK LAYER CONTROL

In ______, the chance of collision can be reduced if a station senses the medium before trying to use it.

• CSMA

• MA

• CDMA

• FDMA

The original ALOHA protocol is called

• simple ALOHA

• pure ALOHA

• CSMA

• FDMA

__________ augments the CSMA algorithm to detect collision.

• CSMA/CD

• CSMA/CA

• either (a) or (b)

• both (a) and (b)

In the _________ method, after the station finds the line idle, it sends its frame immediately. If the line is not idle, it continuously senses the line until it finds it idle.

• p-persistent

• nonpersistent

• 1-persistent

• none of the above

In ___________ methods, no station is superior to another station and none is assigned the control over another.

• controlled access

• random access

• channelization

• none of the above

In the ________method, a station that has a frame to send senses the line. If the line is idle, it sends immediately. If the line is not idle, it waits a random amount of time and then senses the line again.

• controlled access

• nonpersistent

• p-persistent

• none of the above

To avoid collisions on wireless networks, ________was invented.

• CSMA/CD

• CSMA/CA

• either (a) or (b)

• both (a) and (b)

In __________, each station is forced to send only at the beginning of the time slot.

• pure ALOHA

• slotted ALOHA

• both (a) and (b)

• neither (a) nor (b)

In ________ each station sends a frame whenever it has a frame to send.

• slotted ALOHA

• pure ALOHA

• both (a) and (b)

• neither (a) nor (b)

Which of the following tasks is not done by data link layer?

• framing

• error control

• flow control

• channel coding