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L○監視

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ネットワーク監視の用語。L4とかL7とか。
OSI参照モデルのレイヤに基づいて決まる。

L3ならネットワーク層なので、IPでの確認になりpingコマンドを使う。
L4はトランスポート層でTCPでリクエストを送って確認する。
L7はアプリケーション層なのでHTTPリクエストになる。

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