###Network Time Protocol Daemon###
Features:
1. Time synchronization
2. multiple sources
3. Support symmetric keys for time sync with other, controlled(trusted), servers
4. Multiple strate are supported in a hierarchy
a. Strate range: 1(most accurate)- 16(least accurate)
Note: Most accurate means that the stratum level 1 sever has access to an external clock (GPS, radio, etc.)
5. NTP will NOT set your system's clock if it is skewed (off) by 1000 or more seconds
6. If '-g' invocation option is ued, '1000s' skew is overridden
7. NTP is dynamic in it's calculations; alway adjusting the values surrounding target NTP services
Tasks:
1. Explore configuration
a. '/etc/ntpd.conf' - primary config file
2. Start service
a. 'service ntpd start'
3. Query NTPD
a. 'ntpq -np'
Note: Clocks labeled at: stratum 16 are considered unreliable
Note: NTP uses: UDP:123 for source and destination ports
4. Sync Cisco Router
a. 'sh ntp ass'
b. 'ntp server 192.168.75.21'
5. Sync Windows Server
a. 'rdesktop -a 16 -f 192.168.0.75.105'
6. Sync Debian Server with RedHat Server
Note: Configure NTP to sync with 3 or more clocks
linuxcbt-ntpd
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