What are the methods used for reliable data transfer?

Reliable Data Transfer Protocol (RDT/RDP)

• 3.1 Acknowledgment (ACK)
• 3.2 Timeouts.
• 3.3 Congestion Control.
• 3.4 Sequence Numbers (SEQ)
• 3.5 Pipelining.

How TCP provides a reliable data transfer service?

TCP ensures that data is not damaged, lost, duplicated, or delivered out of order to a receiving process. TCP achieves this reliability by assigning a sequence number to each octet it transmits and requiring a positive acknowledgment (ACK) from the receiving TCP.

Why is IP said to be an unreliable service and if so how would TCP provide reliable data transfer on top of IP?

The IP layer provides an unreliable, connectionless delivery system. The reason why it is unreliable stem from the fact the protocol does not provide any functionality for error recovering for datagrams that are either duplicated, lost or arrive to the remote host in another order than they are send.

Which mechanism is required for reliable data transfer upon corrupted packets?

The Transmission Control Protocol (TCP) is a transport protocol that is used on top of IP to ensure reliable transmission of packets. TCP includes mechanisms to solve many of the problems that arise from packet-based messaging, such as lost packets, out of order packets, duplicate packets, and corrupted packets.

What does mean of unreliable data transfer?

Unreliable protocols make no effort to set up a connection, they don’t check to see if the data was received and usually don’t make any provisions for recovering from errors or lost data. Unreliable protocols work best over physical medium with low loss and low error rates.

Is TCP reliable or unreliable?

Transmission Control Protocol (TCP), the main protocol used on the Internet, is a reliable unicast protocol. UDP is an unreliable protocol and is often used in computer games, streaming media or in other situations where speed is an issue and some data loss may be tolerated because of the transitory nature of the data.

What is pipelined reliable data transfer?

In a pipelined reliable data transfer protocol, the sender can start sending a second data packet before the sender receives the acknowledgment for the first data packet. Thus, if the sender needs to send several packets, then the time until the last of the packets is sent will be shorter with a pipelined protocol.

Why is receiver feedback needed in reliable data transfer?

Feedback involves information sent by the receiver back to the sender about reception of sent packets. This is essential for recovery of missing packets. The feedback takes the form of acknowledgments (ACKs) with one of three forms: Negative acknowledgment – “I did not receive the packet with sequence number sn .”

What is the problem with RDT reliable data transfer 2.0 protocol?

RDT 2.0 may look as if it works but it has some has some flaws. It is difficult to understand that the bits to ACK/NAK packets are actually corrupted or not, if the packet is corrupted how protocol will recover from this errors in ACK or NAK packets.