- Similarities and differences of carrier sense multiple access with collision detection (CSMS/CD) and the carrier sense multiple access with collision avoidance (CSMA C/A) network control
- Networks are a shared system.
- When there is sharing, there is interaction.
- Interaction in networking is the sending of information.
- When this information is sent at the same time, on the same line, by different people it can cause problems.(lets call them collisions of data on the same wired/wireless network)
- These problems need to be solved by a protocol to prevent these collisions, hence CSMA/CD and CSMA/CA
- Both use a system of sending and receiving data packets (information)
- Both use Carrier Sensing ie Is there a carrier
- Both use Multiple Access ie others users around
- CSMA/CD is for wired or ethernet networks.
- CSMA/CD it provides a listen, then transmit system
- CSMA/CD, if there is a collision, it waits a random time .5-10 secs, then sends again.
- CSMA/CD, each computer waits a different random time, then sends again.
- Eg 1, computer 1 in computer lab 1 wants to send data to the internet, eg a google search
- Eg 1, computer 2 in computer lab 1 also wants to send data to the internet, eg a goodle search
- Eg1, there could be a collision down the ethernet cable if they both click search at the same time.
Differences CSMA /CA
- CSMA/CA is for wireless networks.
- CSMA/CA uses the Wireless Access Point to control who sends and when they are clear to send.
- Eg 2, iPad 1 in room 1 wants to send data to the internet, eg a google search
- Eg 1, iPad 2 in room 1 also wants to send data to the internet, eg a goodle search
- The WAP will get a ready to send from iPad1 and iPad2 at the same time.
- The WAP will give the 'clear to send' to iPad1
- The WAP will then give the 'clear to send' to iPad 2.
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