What is the purpose of a loopback interface.

What is the statement below of a router configuration file mean..

ntp source Loopback0

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Use this command when you want to use a particular source IP address for all NTP (Network Time Protocol) packets. The address is taken from the named interface. This command is useful if the address on an interface cannot be used as the destination for reply packets.

This was first published in September 2002

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