a. What is the minimum frame size to ensure that node A can detect the collision before completing its frame transmission?
b. What will happen if the chosen minimum frame size is too small?
From the given information,
a. The minimum frame size required to ensure that node A can detect the collision before completing its frame transmission can be determined by considering the time it takes for the signal to propagate from node A to node B. In this case, the signal propagation speed on the cable is given as 200,000 km/sec, and the distance between node A and node B is 1,000 meters. To calculate the propagation time, we can use the formula: propagation time = distance / propagation speed. So, the propagation time is calculated as follows: propagation time = 1,000 meters / 200,000 km/sec. To ensure that node A can detect the collision before completing its frame transmission, node A needs to transmit for at least the time it takes for the signal to propagate to node B. This means that the minimum frame size should be such that it takes at least the propagation time for node A to transmit the frame.
b. If the chosen minimum frame size is too small, it means that node A would not have enough time to detect the collision before completing its frame transmission. In this case, both nodes A and B would continue transmitting their frames without realizing that a collision has occurred. As a result, the frames sent by both nodes would be corrupted and would need to be retransmitted. This would lead to a waste of network resources and decrease the overall efficiency of the network. Therefore, it is important to choose a minimum frame size that allows for sufficient time to detect collisions, ensuring reliable communication and efficient network operation.
Understanding Minimum Frame Size for Collision Detection in Ethernet Network
What is a Collision in Ethernet Network?
In an Ethernet network using CSMA/CD (Carrier Sense Multiple Access with Collision Detection), collisions can occur when two nodes transmit data simultaneously on the same network segment, leading to data corruption and inefficient communication. To prevent or detect collisions, certain mechanisms and specifications are put in place, including the minimum frame size.
Calculation of Minimum Frame Size
Propagation Time Calculation:
To determine the minimum frame size required for collision detection in the given scenario, we first need to calculate the propagation time for the signal to travel from node A to node B. The signal propagation speed on the cable is provided as 200,000 km/sec, and the distance between node A and node B is 1,000 meters. Using the formula propagation time = distance / propagation speed, we can calculate the propagation time.
Importance of Minimum Frame Size:
The minimum frame size is crucial in Ethernet networks to ensure that nodes have sufficient time to detect collisions before completing frame transmission. If the frame size is too small, nodes may not detect collisions in time, leading to data corruption and retransmissions, ultimately reducing network efficiency.
Impact of Small Minimum Frame Size:
If the chosen minimum frame size is too small, node A may not be able to detect the collision before completing its frame transmission. Consequently, both nodes A and B would continue transmitting their frames concurrently, resulting in corrupted data and network inefficiencies. This situation can waste network resources and increase packet loss due to retransmissions.
In conclusion, the minimum frame size plays a crucial role in ensuring collision detection and efficient communication in Ethernet networks. By choosing an appropriate frame size that allows sufficient propagation time for collision detection, network reliability and performance can be optimized.