Hey, ever wonder where your computer clock gets the time or date? How about your cell phone? Well, usually this is from a network time server on the network. It might even be from a couple of time servers on the network. So, in this video we will chat about the network time protocol and take a look at some network time packets.
From RFC 5905:
The Network Time Protocol (NTP) is widely used to synchronize computer clocks in the Internet. This document describes NTP version 4 (NTPv4), which is backwards compatible with NTP version 3 (NTPv3), described in RFC 1305, as well as previous versions of the protocol.
NTPv4 includes a modified protocol header to accommodate the Internet Protocol version 6 address family. NTPv4 includes fundamental improvements in the mitigation and discipline algorithms that extend the potential accuracy to the tens of microseconds with modern workstations and fast LANs.
So, add this ubiquitous protocol to your toolbox and check those clocks!
Books and other products for networkers
Packet Guide to Core Network Protocols:
Packet Guide to Routing and Switching:
Packet Guide to Voice over IP:
Network Engineering Fundamentals:
Advanced Network Engineering:
Virtualization, Networking, and Storage:
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