Question

True or False for Computer networking

1) Suppose in Go-back-N, the sender cycles through sequence number of 0, 1, 2, 3, 4. In addition, the sender chooses the window size N=5 packets (i.e., 5 packets can be in the flight from the sender to the receiver). In this case, reliable data transfer can be achieved from the sender to the receiver

2) At a TCP sender, triple duplicated ACKs are always handled by resending the missing segment.

3) In Go-Back-N, a sender sends a window of 5 segments. The first and third are lost, while the rest of the segments are received successfully by the receiver. Then the sender will only need to retransmit the first, second, and third segments.

4)

Assume a TCP sender always has data to send, and the TCP sending rate is controlled as follows:

LastByteSent - LastByteAcked <= min(cwnd, rwnd).

When rwnd becomes 0, i.e., the receive buffer is full, the TCP sender will stop sending data.

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Answer 1

1.

True.

The transmission is reliable since if packet is lost, sender will resend all the lost frames and also sender makes sure all segment is received by receiver.

2.

False

In case of triple duplicate acknowledgement, sender simply reduces it's window size to half.

3.

False.

In Go Back N, if even one packet of a window is lost, all the entire segment of window size has to be sent.

4.

True.

If receiver window size is 0, sender will stop sending frames and receiver will reject frames if sent.

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