Q4. Compare and contrast a random access protocol with a controlled access
protocol.
Ans-
Random Access Protocol
Controlled Access Protocol
There is no control over which station
holds the link, any station can randomly
use the link, which may even cause
collision.
There is a primary station that controls
the link, and decides which station gets
the link at a given time, thus reducing
chances of collision.
All stations have same superiority that
is no station has more priority than
another station. Any station can send
data depending on medium’s state.
The stations seek information from one
another to find which station has the
right to send. It allows only one node to
send at a time, to avoid collision of
messages on shared medium.
One or more stations cannot depend on
another station nor any station control
another station. All the station has the
equal priority to send the data over a
channel.
Each station interacts and decides to send
a data frame by a particular station
approved by all other stations. It means
that a single station cannot send the data
frames unless all other stations are not
approved.
The methods are:-
ALOHA
CSMA
CSMA/CD
CSMA/CA
The methods are:-
Reservation
Polling
Token Passing
