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RHCSA 8 - CH25
Configuring Time Services
8
Computer Science
Undergraduate 3
01/01/2022

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Term
epoch time
Definition
In Linux, the number of seconds that have passed since epoch (corresponds to midnight on January 1, 1970). Some utilities write epoch time instead of real clock time.
Term
hardware time
Definition
The time that is provided by computer hardware, typically the BIOS clock.
Term
network time
Definition
Time that is provided on the network.
Term
real-time clock (RTC)
Definition
The hardware clock that is installed on the computer motherboard.
Term
stratum
Definition
In time synchronization, used to indicate the distance between a server and an authoritative Internet time source.
Term
system time
Definition
The time that is maintained by the operating system.
Term
time synchronization
Definition
A system that ensures that multiple servers are using the exact same time.
Term
Coordinated Universal Time (UTC)
Definition
A time standard that is globally the same, no matter which specific time zone a user is in. Roughly corresponds to Greenwich Mean Time (GMT).
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