Name: TCP 與 UDP | 網絡要點 (TCP vs UDP | Network Essentials)
Uploaded: 2025-10-14T07:53:48.000Z
Duration: 3 min 25 s

Welcome back to the Network Essentials series.

歡迎回到 Network Essentials 系列。

Today, let's talk about the two members of TCP IP family, protocols TCP and udp Both TCP and UDP are transport layer protocols responsible for managing bidirectional data transmission between devices on a network, with TCP emphasizing reliability and UDP prioritizing speed.

今天我們要來聊聊 TCP IP 這個大家族裡的兩位成員，也就是 TCP 和 UDP 這兩個協定。TCP 和 UDP 都是傳輸層協定，負責管理計算裝置之間的雙向資料傳輸，其中 TCP 強調可靠性，而 UDP 則優先考慮速度。

TCP stands for Transmission Control Protocol, which is a communication standard that enables applications, application programs, and

TCP 的全名是 Transmission Control Protocol，它是一個通訊標準，讓應用程式、應用程式程式和

computing devices to exchange messages over a network.

計算裝置能夠在網路上交換訊息。

TCP is a slower communication protocol than udp, but

TCP 是一個比 UDP 慢的通訊協定，但

also a more reliable one due to features such as sequencing, flow control, and

錯誤檢查等功能，它也更可靠。

Since every received packet of information is confirmed by the server, it makes it practically impossible for information to go missing.

因為伺服器會確認收到的每一個封包的資料，這使得資料幾乎不可能遺失。

You might have seen this example in instant messaging apps like WhatsApp or Messenger.

你可能在 WhatsApp 或 Messenger 這類的即時通訊應用程式裡看過這個例子。

Any discrepancy in texting between a sender and a receiver isn't tolerated.

在傳送者和接收者之間的文字訊息傳遞上，任何的差異都不被允許。

Hence, the TCP protocol is used in text communication to receive full piece of information without any part missing.

是以，TCP 協定在文字通訊中用來接收完整的資料，不會遺漏任何部分。

For instance, a sender device gives the first packet of information to a server.

舉例來說，傳送裝置會將第一份資料封包傳給伺服器。

When the server receives it, it provides a confirmation of that packet's reception to the sender.

當伺服器收到後，會向傳送者確認收到該封包。

When the sender receives the confirmation from the server, it sends the second packet of information.

當傳送者收到伺服器確認後，便會傳送第二份資料封包。

It goes on and on until all packets of information are delivered successfully.

這個過程會一直持續，直到所有資料封包都成功傳送為止。

Now, let's say there was a network error and the second packet traveling from the sender wasn't delivered to the server.

現在，假設發生了網路錯誤，第二個從傳送者傳送的封包沒有送到伺服器。

In this case, the server still sends the response saying that it only received and acknowledged the first packet.

這種情況下，伺服器仍然會回覆說它只收到了第一個封包並已確認。

The device understands that it failed to send the second packet and resends it.

裝置會明白它未能傳送第二個封包，並會重新傳送。

It's important to note that TCP doesn't always send the parts chronologically.

需要注意的是，TCP 並非總是按照時間順序傳送這些部分。

It can be mixed up, but the receiver reassembles the given data in correct order.

它們可能會被打亂，但接收者會將收到的資料重新組合成正確的順序。

It stands for user, which is a communication protocol for time sensitive tasks like online gaming, media streaming, or performing security camera lookups.

它代表使用者，是一種用於時間敏感任務的通訊協定，例如線上遊戲、媒體串流或執行安全攝影機查詢。

UDP results in a speedier communication because it doesn't spend time forming a firm connection with the server before transferring the data.

UDP 能夠實現更快的通訊，因為它在傳輸資料之前，不會花時間與伺服器建立穩固的連線。

A good example of how the UDP protocol works is online video games.

UDP 協定如何運作的一個好例子就是線上遊戲。

Since high latency isn't welcome in online gaming, UDP is the preferred protocol for data transmission to the server.

由於線上遊戲不歡迎高延遲，UDP 是資料傳輸到伺服器的首選協定。

UDP doesn't retransmit the lost data data and is a connectionless protocol making data packets travel much faster.

UDP 不會重新傳輸遺失的資料，而且是一種無連線協定，能讓資料封包傳送得更快。

So UDP simply sends data to the server without waiting for acknowledgment.

所以 UDP 會直接將資料傳送給伺服器，而無需等待確認。

Essentially, TCP is a more reliable communication protocol as it works closely with the server, despite being slower.

基本上，TCP 是一個更可靠的通訊協定，因為它與伺服器緊密合作，儘管速度較慢。

In contrast, UDP continuously sends data to the server, resulting in faster data transmission, but

相比之下，UDP 會持續將資料傳送給伺服器，從而實現更快的資料傳輸，但

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TCP 與 UDP | 網絡要點 (TCP vs UDP | Network Essentials)

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