Go-back-n

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Pytanie 1: Frames sent by a go-back-n sender

You implement a Go-back-n sender and observe the following frames that you send/receive. Assume that you use a window of three frames.

The receiver has correctly received the three frames that you have sent, but one acknowledgement has been lost.

The receiver has correctly received the first two frames. The third frame and the first acknowledgement have been lost.

The receiver has correctly received the second and the third frame that your have sent. The first frame has been lost and should be retransmitted.

Pytanie 2: A go-back-n sender

You implement a Go-back-n sender and observe the following frames that you send/receive. Assume that you use a window of three frames.

Which affirmation is correct among the ones below:

The receiver has correctly received the first and the third frame that your have sent. The second frame has been lost and should be retransmitted.

The receiver has correctly received the three frames that you have sent, but one acknowledgement has been lost.

The receiver has correctly received the first two frames. The third frame and the second acknowledgements have been lost.

Pytanie 3: A go-back-n sender

You implement a Go-back-n sender and observe the following sequence of frames. Assuming that you have a window of three segments.

Among the following affirmations, only one is correct. Which one ?

Since you never received C(OK,0), there was something wrong in the transmission of the first frame. You retransmit this frame immediately after having received C(OK,1).

After having received C(OK,1), you know that the first two frames have been received correctly. Since you never received an acknowledgement for the third frame, you will retransmit it after the expiration of the associated retransmission timer.

The first three frames have been received correctly. Upon reception of C(OK,1), you can immediately transmit the next data frame, i.e. D(3,d).

Pytanie 4: A go-back-n receiver

You implement a go-back-n receiver and receive the following frames.

How do you respond to the reception of the frame D(2,b) ?

You issue a Data.ind(b) to deliver the information to your user and respond with C(OK,2).

You ignore the out-of-sequence frame and respond with C(OK,0).

You ignore the out-of-sequence frame and respond with C(OK,1).

Autor(zy)	Olivier Bonaventure
Termin	Brak terminu
Limit zgłoszeń	Bez limitu
Znaczniki kategorii	reliable

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