I am just wondering why we can;t just do with "switchport mode trunk" but need to
put "switchport trunk encapsulation dot1q" first before can do trunking on the port.
Command rejected: An interface whose trunk encapsulation is "Auto" can not be configured to "trunk" mode.
I thought dot1q is only meant for trunking between router LAN and switch?
Hope to get enlightenment again..:)
No, you don't. Your laptop should be able to communicate to other devices on the same Vlan, by default -and- devices at other Vlan by using the distribution switch Layer3 interface as the default gateway.
The distribution switch and the access switch must have the same Vlan information, specially the Vlan where you laptop resides.
The ip default-gateway information is useful for telneting into the switch and perform remote management tasks.