CISCO的網頁中，有段文字描述，覺得挺受用的，
OSI七層， 一言以敝之: "All People Seem To Need Data Processing"
All =====> Application layer
People ==> Presentation layer
Seem ===> Session layer
To =====> Transport layer
Need ===> Network layer
Data ====> Data link layer
Processing ==> Physical layer
背起來了嗎? ^_^
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