Role selective repeat ARQ Protocol and how it helps

The process of transmitting data over a communication network is prone to packet losses and errors. Selective Repeat ARQ (Automatic Repeat Request) protocol is an effective method to ensure the reliable delivery of data packets in data communication networks. This protocol helps to ensure efficient use of network resources and reduction in retransmission time, leading to faster delivery of data packets.

Selective Repeat ARQ (Automatic Repeat Request) is a protocol used in data communication networks to ensure the reliable delivery of data packets. It is a variation of the traditional ARQ protocol that allows for selective retransmission of lost or corrupted packets, rather than retransmitting all packets, which can lead to unnecessary network congestion.

In Selective Repeat ARQ, both the sender and the receiver maintain a buffer of the transmitted packets. The sender sends a block of data packets, and the receiver acknowledges the receipt of the packets using an acknowledgement (ACK) message. If the sender receives an ACK message from the receiver, it removes the acknowledged packets from its buffer and sends the next block of packets. However, if the receiver detects a lost or corrupted packet, it sends a negative acknowledgement (NAK) message, indicating which packets were lost or corrupted. The sender then retransmits only the lost or corrupted packets, rather than resending the entire block of packets.

The Selective Repeat ARQ protocol helps in several ways:

1. Efficient use of network bandwidth: By selectively retransmitting only the lost or corrupted packets, Selective Repeat ARQ reduces the amount of unnecessary traffic on the network, leading to more efficient use of available bandwidth.

2. Faster delivery of data: By retransmitting only the lost or corrupted packets, Selective Repeat ARQ ensures that the data is delivered to the receiver faster than other ARQ protocols with syntax-directed translation.

3. Improved reliability: Selective Repeat ARQ improves the reliability of data transfer by ensuring that only the lost or corrupted packets are retransmitted, rather than resending the entire block of data.

4. Better handling of network errors: Selective Repeat ARQ is capable of handling multiple packet losses and errors in a single block, making it more resilient to network errors and packet losses.

Overall, Selective Repeat ARQ is a more efficient and reliable protocol for data communication networks, particularly in situations where bandwidth is limited and packet losses are common. By selectively retransmitting lost or corrupted packets, it reduces network congestion, improves data transfer speed, and ensures reliable delivery of data packets.

Selective Repeat ARQ (Automatic Repeat Request) is a data link layer protocol used in communication networks to ensure the reliable delivery of data packets. It is a variation of the traditional ARQ protocol that allows for selective retransmission of lost or corrupted packets, rather than retransmitting all packets, which can lead to unnecessary network congestion.

In Selective Repeat ARQ, both the sender and the receiver maintain a buffer of the transmitted packets. The sender sends a block of data packets, and the receiver acknowledges the receipt of the packets using an acknowledgement (ACK) message. If the sender receives an ACK message from the receiver, it removes the acknowledged packets from its buffer and sends the next block of packets. However, if the receiver detects a lost or corrupted packet, it sends a negative acknowledgement (NAK) message, indicating which packets were lost or corrupted. The sender then retransmits only the lost or corrupted packets, rather than resending the entire block of packets.

The major advantages of the Selective Repeat ARQ (Automatic Repeat Request) protocol are as follows:

• Efficient use of network resources: Selective Repeat ARQ helps in the efficient use of network resources as it only retransmits the lost or corrupted packets, instead of retransmitting the entire block of data. This reduces the amount of unnecessary traffic on the network, leading to more efficient use of available bandwidth.

• Faster delivery of data: Selective Repeat ARQ ensures faster delivery of data as it retransmits only the lost or corrupted packets, leading to a reduction in retransmission time and improved throughput.

• Improved reliability: Selective Repeat ARQ improves the reliability of data transfer by ensuring that only the lost or corrupted packets are retransmitted, reducing the probability of further errors in the transmission.

• Resilience to network errors: Selective Repeat ARQ is capable of handling multiple packet losses and errors in a single block, making it more resilient to network errors and packet losses.

• Reduced network congestion: Selective Repeat ARQ helps in reducing network congestion as it only retransmits the lost or corrupted packets, leading to less unnecessary traffic on the network.

• Improved Quality of Service (QoS): Selective Repeat ARQ ensures a better Quality of Service (QoS) by improving the efficiency and reliability of data transfer, which is particularly important in real-time applications such as video conferencing and online gaming.

Selective Repeat ARQ is considered more efficient than other ARQ protocols because it only retransmits the lost or corrupted packets, leading to a reduction in retransmission time and improved throughput. It is particularly useful in situations where bandwidth is limited and packet losses are common, as it helps in the efficient use of network resources, reduces network congestion, and ensures reliable delivery of data packets.

Overall, Selective Repeat ARQ is a reliable and efficient protocol for data communication networks, especially in situations where packet losses and network errors are common. It improves the reliability and efficiency of data transfer, reduces network congestion, and ensures faster delivery of data packets.

In summary, the Selective Repeat ARQ protocol has several advantages over other ARQ protocols, including efficient use of network resources, faster delivery of data, improved reliability, resilience to network errors, reduced network congestion, and improved Quality of Service (QoS).

Selective Repeat ARQ protocol is an effective method to ensure the reliable delivery of data packets in data communication networks. The protocol reduces network congestion, ensures efficient use of available network bandwidth, and improves the reliability and efficiency of data transfer. The protocol is particularly useful in situations where bandwidth is limited, and packet losses are common. Overall, the Selective Repeat ARQ protocol plays a significant role in ensuring efficient and reliable data transmission over communication networks.