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WorksheetsDATA LINK LAYER CONTROL
Total questions: 20
Worksheet time: 10mins
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
Which of the following is the multiple access protocol for channel access control?
CSMA/CD
CSMA/CA
Both CSMA/CD & CSMA/CA
HDLC
_______ control refers to a set of procedures used to restrict the amount of data that the sender can send before waiting for acknowledgment.
Flow
Error
Transmission
none of the above
The Simplest Protocol and the Stop-and-Wait Protocol are for ______ channels.
noiseless
noisy
either (a) or (b)
neither (a) nor (b)
In the _____ Protocol, the sender sends its frames one after another with no regard to the receiver.
Simplest
Selective-Repeat ARQ
Stop-and-Wait
Go-Back-N ARQ
In the _____ Protocol, the sender sends one frame, stops until it receives confirmation from the receiver, and then sends the next frame.
Simplest
Stop-and-Wait
Selective-Repeat ARQ
Go-Back-N ARQ
The Carrier Sense Multiple Access/Collision Detection (CSMA/CD) is used to avoid the
errors
multiple access
point to point access
collision
------------tells the sender how much data to send
Error Control
Flow control
Medium Access
Multiple Access
In CSMA/CD , CD means...........................
Collision Detection
Collision Deadock
Collision Deterioration
Collision Deletion
CSMA/CD is an extension of ----------------------method
CDMA
CSMA
CAMS
CMAS
In CSMA/CD after the occurrence of collision, station waits for some random ---------------- and then retransmits.
back time
backoff time
back out time
back in time
