Types of MAC Protocols Quiz

Trivially simple

Collisions can and will occur

Assume a Poisson arrival process to describe packet transmissions; infinite number of stations, all behave identically, independently; time between two attempts is exponentially distributed, independent for any pairs of events; all packets are of unit time length

<p>It must not collide with any other packet</p> Signup and view all the answers

<p>Use of satellite networks</p> Signup and view all the answers

<p>1985 by Abrahmson et al., University of Hawaii</p> Signup and view all the answers

<p>Guaranteed collisions when more than one station wants to transmit</p> Signup and view all the answers

<p>Better efficiency despite guaranteed collisions</p> Signup and view all the answers

<p>Sense the carrier to check if it is idle</p> Signup and view all the answers

<p>How to behave when the carrier is busy</p> Signup and view all the answers

<p>Wait until the carrier is idle before transmitting</p> Signup and view all the answers

<p>A CSMA scheme suffers from a principal complication related to propagation delay because if two stations become ready to send at nearly the same time, the second station may not detect the already started transmission of the first station due to the delay, leading to collisions.</p> Signup and view all the answers

<p>The purpose of Collision Detection in CSMA/CD is to detect collisions immediately so that transmissions can be aborted, saving time and allowing for a new transmission attempt.</p> Signup and view all the answers

<p>In wired networks like Ethernet under CSMA/CD, collisions can be detected by the sender comparing the signal current/power it sends with the signal current/power it receives. If the received power is higher than the sent power, a collision is declared.</p> Signup and view all the answers

<p>The collision detection method using signal power does not work for wireless networks because in wireless setups, the sender cannot listen and receive at the same time due to the half-duplex constraint.</p> Signup and view all the answers

<p>In CSMA schemes, a larger propagation delay leads to less synchronicity between stations, increasing the likelihood of collisions.</p> Signup and view all the answers

<p>The lack of synchronicity between stations due to propagation delay in CSMA schemes increases the probability of collisions, especially when stations become ready to send at nearly the same time.</p> Signup and view all the answers