I want to know why do not have MAC address on loopback interface on Router or Switch??
If I see on useing #show int loopback 0
There is no MAC address.
If these are not support the MAC address then it's only depend on IP even on WAN area??
Please your helpful reply require..
Encapsulation is how you build a header for a particular physical media. Since there is no physical media associated with a loopback interface there is no encapsulation associated with a loopback interface.
Yes, the ping is via the IP addresses and IP routing. There is no
encapsulation required for that.
Let us start the explanation by reviewing a fundamental concept about MAC address. The purpose of a MAC address is to distinguish individual devices on the media (it is a link local layer 2 address).
Since the loopback interface is by definition not connected on any physical media there is no purpose in a link local address and MAC addresses are not supported on loopback interfaces.