From the course: Cisco Networking Foundations: Wireless Networks, Services, Security, and Virtualization

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Network Time Protocol (NTP) theory

Network Time Protocol (NTP) theory

From the course: Cisco Networking Foundations: Wireless Networks, Services, Security, and Virtualization

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Network Time Protocol (NTP) theory

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- [Instructor] One of my favorite sayings about time is that a person with one watch always knows what time it is. A person with two watches is never quite sure. Well, in the network we want to have one watch, one authoritative time source, so all network devices agree on the time, and we can do that using a protocol called NTP, the Network Time Protocol. That's going to allow all of our network devices running NTP to synchronize their clocks. Why is that valuable? Well, as one example, if I'm trying to interpret log files as I'm doing troubleshooting, I can see that a certain event happened at this time on this router, and then about one second later on this server this other event happened, maybe they're related, maybe we can do some event correlation. And I also want you to know that NTP uses UDP Port 123 and in an earlier course I gave you a memory aid for that you might recall. It reminds me of the old Jackson 5 song…

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