Which of the following statements is TRUE about CSMA/CDa)IEEE 802.11 w...
Efficiency of CSMA/CD = 1/(1+6.44(Tp/Tt))
Tp = propagation time
Tp = transmission time
Hence if propagation time increases efficiency will rapidly decrease.
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Which of the following statements is TRUE about CSMA/CDa)IEEE 802.11 w...
CSMA/CD protocol and its applications
CSMA/CD (Carrier Sense Multiple Access with Collision Detection) is a protocol used in Ethernet networks to avoid collisions between multiple devices trying to access the same network at the same time. It works by sensing the carrier signal on the network before transmitting data and detecting collisions if they occur.
True statement about CSMA/CD
The correct answer is option C: CSMA/CD is not suitable for a high propagation delay network like the satellite network. This statement is true because CSMA/CD relies on detecting collisions and retransmitting data if a collision occurs. However, in a network with high propagation delay, it takes a long time for the signals to travel back and forth between devices, which means that collisions may not be detected in time. As a result, CSMA/CD is not suitable for satellite networks, which have a high propagation delay due to the long distances involved.
Other statements about CSMA/CD
The other statements are false:
- IEEE 802.11 wireless LAN runs CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance) protocol, which is a variation of CSMA/CD that uses different mechanisms to avoid collisions.
- Ethernet is based on CSMA/CD protocol, which is used to manage access to the shared medium.
- There is contention in a CSMA/CD network, as multiple devices may try to access the network at the same time and collide with each other. CSMA/CD is used to manage this contention and avoid collisions.