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TCP Vs. UDP

TCP and UDP have many differences. TCP is reliable, but UDP is unreliable. TCP focuses on connection-oriented communications using the three-way handshake, while UDP is connectionless. TCP uses windowing, discussed in more detail later, to control the amount of data sent at a given time based on changing network speeds, but UDP simply transmits everything once with no windowing. TCP also supports segment sequencing; UDP just hopes it gets to the destination in the right order. Finally, TCP waits for acknowledgements, but UDP just hopes it got there. To simplify it, TCP is an assured and reliable communication method, UDP is just a best-effort model.

TCP和UDP有很多區別。 TCP是可靠的，但UDP是不可靠的。 TCP專注於使用三向握手的面向連接的通信，而UDP是無連接的。 TCP使用開窗（稍後將更詳細地討論）來基於不斷變化的網絡速度來控制在給定時間發送的數據量，但是UDP僅傳輸所有信息一次而沒有開窗。 TCP還支持段排序； UDP只是希望它以正確的順序到達目的地。最後，TCP等待確認，但是UDP只是希望它到達目的地。為簡化起見，TCP是一種有保證且可靠的通信方法，UDP只是一種盡力而為的模型。

True or False: UDP is slower than TCP because UDP transmits everything at once with no windowing.

是非題：UDP比TCP慢，因為UDP一次無窗口傳輸所有內容。

TrueFalse

True or False: TCP is more reliable than UDP.

是非題：TCP比UDP更可靠。

TrueFalse

Golda needs to stream large amounts of video quickly. Which protocol would best meet Golda’s needs?

Golda需要快速流式傳輸大量視頻。哪種協議最能滿足Golda的需求？

TCPUDPADPNone of the above.

Correct. UDP is best suited for video streaming because it transmits data all at once. By transmitting data all at once, UDP can transmit large amounts of data quickly. Because there is so much data in a video, any loss of small data packets in transmission will likely not be noticeable to the end user.

正確。 UDP最適合視頻流，因為它可以一次傳輸所有數據。通過一次全部傳輸數據，UDP可以快速傳輸大量數據。由於視頻中的數據太多，因此最終用戶可能不會注意到傳輸中丟失的小數據包。

Using the dropdown menus, select the protocol that best fits the description.

使用下拉菜單，選擇最適合描述的協議。

Connection oriented:

Connectionless:

No windowing or retransmission:

No sequencing:

Acknowledge segments:

Segment sequencing:

Segment retransmission and flow control through windowing:

No acknowledgements:

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