Selective repeat

Dán dòng lệnh này vào terminal của bạn:

Mật khẩu để kết nối là

Câu hỏi 1: A selective repeat sender

You implement a Selective-repeat 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 three frames that you have sent, but one acknowledgement has been lost. No retransmission is needed.

The frames containing a and b have been received correctly. The third frame (containing c) has not been received.

The receiver has only received the first frame that you have sent. It has neither received the second nor the third frame. You plan to retransmit only the second frame.

Câu hỏi 2: A selective repeat receiver

You implement a selective repeat receiver and receive the following frames.

How do you respond to the reception of the frame D(3,b) ?

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

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

You place the frame in your buffer and respond with C(OK,1).

Tác giả	Olivier Bonaventure
Hạn chót	Không có hạn chót
Giới hạn nộp bài	Không có giới hạn
Các tag chuyên mục	reliable

Thông tin

Tags

Đăng nhập