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https://gongquiz.com/main/pages/OSI+%EA%B3%84%EC%B8%B5%EA%B5%AC%EC%A1%B0%EC%99%80+%EA%B3%84%EC%B8%B5%EB%B3%84%EB%A1%9C+%EC%82%AC%EC%9A%A9%EB%90%98%EB%8A%94+%EB%B3%B4%EC%95%88+%ED%94%84%EB%A1%9C%ED%86%A0%EC%BD%9C%EC%9D%98+%EC%97%B0%EA%B2%B0%EC%9D%B4+%EC%98%B3%EC%A7%80+%EC%95%8A%EC%9D%80+%EA%B2%83%EC%9D%80%3F.quiz??mode=practice&quizNo=706335&historyNo=reset
[]
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practice
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