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OSI参照モデルL2〜L4層

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  • L2:データリンク層
    • 隣接するコンピュータ同士を接続
    • イーサネット(有線)・LAN(無線)で接続
    • ポイントは、L2はローカル通信であること
  • L3:ネットワーク層
    • IPを使用してコンピュータ同士を接続
    • ルータを使用し、隣接してない離れたコンピュータに接続できる
  • L4:トランスポート層
    • WebサーバとDBをつなぐ
    • 代表的なプロトコル2つ
      • TCP
        • 確実に情報届けるけど通信速度遅い
      • UDP
        • 確実ではないけどとりあえず届ける、その代わり通信速度早い
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