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![Chapter 8] 8.13 Network Time Protocol (NTP)](https://docstore.mik.ua/orelly/networking/firewall/figs/fire0819.gif "Chapter 8] 8.13 Network Time Protocol (NTP)")
Chapter 8] 8.13 Network Time Protocol (NTP)
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Network Time Protocol — Wikipédia
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Network Time Security: new NTP authentication mechanism | APNIC Blog
