Hello Bikram
The set of commands you indicate here would do the following:
- A subinterface of G0/1.1 would be created on the G0/1 physical interface
- The subinterface uses dot1q encapsulation with a VLAN ID of 1
- The
native
keyword indicates that this VLAN will be the native VLAN
For more information about what a native VLAN is, take a look at this lesson.
I hope this has been helpful!
Laz