Please answer the questions clearly and explain only the solution. Please do not copy and paste from the solutions in the site as the majority of answers are not precise.

$418$

I$)$ In the OSI $7-$layer model, what tasks are allocated to the medium access

$($MAC$)$ sub layer?

II$)$ Briefly explain the operation of an Aloha network. In what applications is

Aloha used and why?

$417$

III$)$ Is the token ring protocol appropriate for a wireless network? Briefly

explain

$316$

IV$)$ Briefly explain the operation of a token$-$ring network. Are collisions

possible in token ring? Explain.

V$)$ Why is an Aloha protocol appropriate than CSMA$-$CD for schemes where

propagation time is very long, e$.$g$.$ in satellite communication?

$515$

VI$)$ Why is an Aloha network much less efficient than CSMA$/$CD$?$ In what

application is Aloha more appropriate than CSMA$/$CD$?$

Please answer the questions clearly and explain only the solution. Please do not copy and paste from the solutions in the site as the majority of answers are not precise.