January 2018
Intermediate to advanced
856 pages
17h 17m
Chinese
Content preview from Python 技術手冊 第三版
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第 17 章 網路基礎
點）」。這一層接著會使用
連結
（
link
）或
子網路
（
subnetwork
）層在來源
（source）到目的地（destination）路上的個別系統之間傳遞資料包。
要傳送資料，應用程式會將一整塊的資料傳到傳輸層，而這接著會將資料
切成資料段大小的組塊傳到網路層，然後它會依據它對區域網路結構的了
解來判斷要用哪個連結將資料送往第一個轉送點，以及要用何種資料包大
小來分割資料段。使用適當的驅動程式，網路層會以選定的連結將資料包
當成封包（packets）傳送出去。中介的每個系統都會解開連結層的封包，
取出網路層的資料包，並以下一個轉送點的連結層協定包裹它們，依據路
由送往下一個系統。最後，資料包抵達其最終目的地，在那裡網路層會將
它往上送到傳輸層，該層會重組資料框，最後將所產生的訊息遞送其目的
的應用程式行程。
本章涵蓋網路原理、
socket
模組，以及
ssl
模組的核心功能子集：這就足
以讓你撰寫一些簡單的網路客戶端和伺服器，更重要的是，讓你在較高的
抽象層正確使用涵蓋於第 19 章的網路模組，以及涵蓋於第 18 章的非同步
架構（asynchronous architectures）。
網路原理
連線導向
（
connection-oriented
）的協定就像是打電話一樣。你請求對某
個特定
網路端點
（
network endpoint
，這等同於撥打某人的電話號碼）的連
線，然後對方選擇接或不接。如果他們接受，你就可以開始說話，並聽到
他們的回答（必要的話，可以是同時的），所以你知道什麼都不會遺失。 ...
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