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building a cheap stratum 1 gps ntp timeserver – markus' self teaching
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ネットワーク・タイム・プロトコル (NTP)
350-401Jトレーリングサンプル質問53：信頼できるタイムソースに直接接続されているサーバーのNTP層レベルは何ですか？
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Raspberry Pi 3 で NTP Stratum-1 Server を作る(Raspbian stretch) [tosihisa's public notebook]
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TCP/IP - NTPとは
