CSMA/CD (Collision Detection) is that every host (device) has equal rights or access to the wire and is able to put data on the wire whenever it is free of traffic.  The host will sense the copper wire to see if traffic is present and if so it will wait till the wire is free and place the data on the copper medium.  Now if two hosts apply data at the same time it will cause a collision and both hosts’ data will be dropped.  At that time the hosts will wait a preset time before sending data again across the line to avoid a collision.

Token Ring Passing there isn’t a chance of a collision.  There is a token and the host will hold a token (blank packet) when passing data.  The token is circulating the network at a rapid speed and if any host want’s to send data they have to wait for the token once they receive the token they may fill it and send the data across the LAN.

The pitfalls of both in CSMA/CD you have a higher change of more collisions the more you increase the amount of hosts you have on the LAN.  That is also why we use managed switches on our network.  With token ring passing even though you have no collisions you must wait till the token is available before you can send your data.  The other pitfall of token ring is that it has much slower speeds then Ethernet and really it’s obsolete.


Work Referenced:

July 29 2016. OmniSecu.com. KB: Network Access Methods, CSMA/CD, CSMA/CA and Token Passing, Difference between CSMA/CD CSMA/CA and Token Passing. Referenced From: http://www.omnisecu.com/basic-networking/network-access-methods.php



Respond 150 words Minimum

CSMA is carrier sense multiple access with collision detectsion’s basic function is to try to communicate after the PC detects whether whose communication line is not in use. This method of transmitting data works when no one uses the PC. The carrier sense can detect whether if data has gone through the communication line or not. The carrier is like a signal on the line. Simple carrier sense multiple access does not care about after transmitting the data. If the two PC transmits data simultaneously at the same time, there will be a problems collide right? So you will need to check whether that data go well or collide. The collision detect can help you detect the process and is intended to confirm whether or not there is a conflict. If a collision happens after transmitting the data, it will wait a random time and attempt to transfer again. (Bryant, 2015)

The token ring system is mainly used in the ring-like topology. The carrier sense multiple access can transmit data by anyone but in a token ring system, you can transfer the data only on a PC that is equipped with an authority that data can send a token. The token transmit around the network in a certain direction. The PC that has data to transmit will wait for the token and send the data when the token is available. Then it passes the token to the next PC. Benefit in a token ring system is that collision does not occur, but the disadvantage is that data transmitting PC must wait until the token. (Omnisecu, 2016)


Bryant, C. (2015). How Ethernet CSMA/CD Works. Retrieved July 25, 2016, from MC MCSE Certification Resources: http://www.mcmcse.com/cisco/guides/csma.shtml

OmniSecu. Network Access Methods, CSMA/CD, CSMA/CA and Token Passing, Difference between CSMA/CD CSMA/CA and Token Passing. Retrieved from http://www.omnisecu.com/basic-networking/network-access-methods.php