The importance of time
All devices have an internal clock (routers, switches, your PC, etc).
In Cisco IOS, you can view the time with the show clock
command.
R1# show clock
*00:16:00.87 UTC Sat Dec 26 2020
If you use the show clock detail
command, you can see the time source.
R1# show clock detail
*00:19:49.411 UTC Sat Dec 2 2020
Time source is hardware calendar
The internal hardware clock of a device will drift over time, so it is not the ideal time source.
From a CCNA perspective, the most important reason to have accurate time on a device is to have accurate logs for troubleshooting.
Syslog, the protocol used to keep device logs, will be covered later.
Logs


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