A properly managed network provides a reliable time source that can be used by all the nodes. Sharing the same time makes meaningful comparisons of log files of different hosts possible because the timestamps correspond between them. This becomes important in an attack against a network and allows a thorough investigation of the causes and activities.
The Network Time Protocol (NTP) is a widely deployed solution that you can use to synchronize time over a network. Almost every operating system features an NTP client in the default installation and even a large number of blackbox devices are capable of querying an NTP server. On Linux you can use either the NTP package, which contains ntpdate and ntpd, or OpenNTPD, which is a more lightweight solution.
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