After executing the display interface Ethernet 1/0/2 command on the switch SWA, the output information is as follows:

After executing the display interface Ethernet 1/0/2 command on the switch SWA, the output information is as follows:

[SWA]display interface Ethernet 1/0/2

Ethernet1/0/2 current state: UP

PVID: 10

Mdi type: auto

Link delay is 0(sec)

Port link-type: trunk

VLAN passing: 1 (default vlan), 10

VLAN permitted: 1 (default vlan), 2-4094

Trunk port encapsulation: IEEE 802.1q

Port priority: 0

It can be judged from the above output
A . Port Ethernet1/0/2 only allows data from VLAN 1 and VLAN 10 to pass through
B . The only VLANs existing on the switch are VLAN1 and VLAN10
C . Data frames with VLAN1 tags will not be stripped off when they leave port Ethernet1/0/2
D . Data frames with VLAN20 tags will be discarded when they enter port Ethernet1/0/2