Computer Networks Lecture 8: Principles of Reliable Data Transfer

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What is the primary goal of reliable data transfer?

Ensuring no data loss or bit errors (correct)

Maximizing throughput

Optimizing network bandwidth

Minimizing latency

What is the function assumed for achieving reliable data transfer?

Efficient data transfer (edt)

Secure data transfer (sdt)

Reliable data transfer (rdt) (correct)

Fast data transfer (fdt)

How is reliable data transfer protocol developed incrementally?

Using finite state machines (FSM) (correct)

Using asynchronous communication

Using abstract data types

Using algorithmic complexity

What is the role of finite state machines (FSM) in specifying sender and receiver sides of reliable data transfer protocol?

Specifying state transitions based on events Signup and view all the answers

According to the lecture, what defines the next state in reliable data transfer protocol?

The next event and current state Signup and view all the answers

What feature characterizes reliability in data transfer, as per the lecture?

No data loss and no bit errors Signup and view all the answers

In the context of the reliable data transfer protocol, what is the purpose of acknowledgements (ACKs)?

To notify the sender that the packet was received without errors Signup and view all the answers

What is the function of negative acknowledgements (NAKs) in the context of reliable data transfer?

To request the sender to retransmit the packet Signup and view all the answers

What is the purpose of adding a sequence number to each packet in the reliable data transfer protocol?

To ensure that the receiver doesn't deliver duplicate packets Signup and view all the answers

What happens if an ACK/NAK is not received in the reliable data transfer protocol?

The sender waits for a timeout period before resending the packet Signup and view all the answers

What is one of the major differences between rdt1.0 and rdt2.0 in terms of error handling?

rdt2.0 uses negative acknowledgements (NAKs) while rdt1.0 does not Signup and view all the answers

What is used to detect bit errors in packets in the context of reliable data transfer?

Checksums Signup and view all the answers

Why does rdt2.0 use both acknowledgements (ACKs) and negative acknowledgements (NAKs)?

To prevent potential duplicate packets from being delivered to the receiver Signup and view all the answers

What is the consequence if ACK/NAK is not received in reliable data transfer protocol?

The sender waits for a certain time before retransmitting the packet Signup and view all the answers

In what way does rdt2.0 improve upon rdt1.0?

By introducing acknowledgements (ACKs) and negative acknowledgements (NAKs) Signup and view all the answers

What does rdt2.0 do with an NAK if it receives one?

Requests the immediate retransmission of the packet by sending a NAK to the sender Signup and view all the answers

What is one potential drawback of rdt2.0 if an ACK/NAK is not received?

The sender may never receive feedback on successful receipt of sent packets Signup and view all the answers

What step does rdt2.0 take when it detects bit errors in a received packet?

It immediately requests retransmission of the packet by sending an NAK to the sender Signup and view all the answers

Computer Networks Lecture 8: Principles of Reliable Data Transfer

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