
NCUTCSIE-GBN & SR
Authored by Chun-Jung Lin
Computers
University
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6 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在回溯 N (GBN) 協定中,傳送端可在未收到確認的情況下同時傳輸多份封包,但其上限由哪一個參數決定?
往返時間(RTT)
視窗大小 N
接收端快取容量
重傳逾時(RTO)
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
在回溯 N(GBN)協定中,接收端對於「順序不正確」的封包會採取哪一種處理方式?
暫存起來等待缺失封包
立即丟棄,不予暫存
轉交上層再回補
回傳NAK並保留封包
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列何者是 GBN 在高錯誤率通道上的主要限制,促使需要 SR?
無法使用確認機制
會因單一錯誤而重送大量其實已被正確收到的封包
只能傳送固定大小的封包
不支援計時器
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
當 SR 傳送端視窗因 ACK 推進而使得有尚未傳輸的封包之序號進入視窗時,應採取的動作為何?
將其標記為丟棄
立即傳輸這些封包
等到下次逾時才傳
等待連續 ACK 後再送
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
序號的主要目的為何?
提供加密能力
讓接收端能夠偵測遺失與重複封包
減少封包大小
決定視窗大小
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
下列哪個配對最正確地描述機制與其用途?
檢查和-決定何時重送
序號-提供位元錯誤偵測
確認訊息-告知已正確收到並指明被確認的序號
視窗-保證零遺失
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