Vlan Tagging at Access Port in Switch

Hi all,

I'm Confused from the fact that Vlan tagging is done at access port and trunk port always gets tagged packets (untill its case of native vlan).But I still believe in other fact which says tagging happen only when a frame hit the trunk port which means trunk port gets untagged frame and tagging is not possible at access port.

Would like to know where actually this tagging happens ?

and also which command we can use to encapsulate 802.1q protocol to access port ?
The way we do at trunk port is

#switchport trunk encapsulation dot1q

Is the above command applicable for access mode also?

 

>Would like to know where actually this tagging happens ?

Tags are only inserted into frames that exit trunk ports.

>and also which command we can use to encapsulate 802.1q protocol to access port ?

On some switches, this requires two commands:

switchport trunk encap dot1q
switchport mode trunk

Just defining the encapsulation does not make a trunk. The "switchport mode trunk" command does that.