050-733 – SUSE Certified Linux Administrator 12

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  The netdate command and the ntpd use the same port

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  The Network Time Protocol uses port 123, TCP

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  A Stratum 16 server is one that sets it's time by some external reference clock, such as an atomic clock.

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  NTP aims at correcting the system time without sudden bigger changes.

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  /etc/clock.conf is the NTP daemon configuration file.
  
  

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  systemctl disable sshd

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  systemdctl disable sshd

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  systemd-stop sshd

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  systemctl sshd - -status=disabled
  
  

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  -20

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  0

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  -19

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  99

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  19
  

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  20