A service provider has configured an HP 5406 zl switch to support QinQ in mixed mode. Port A1 is a member
of C-VLAN 100. Which usage is supported by this configuration?

A.
Port A1 is an uplink port that forwards the customer’s tunneled traffic to another switch in the service
provider’s network.

B.
Port A1 is connected to a customer’s switch, and the switch tunnels all VLAN traffic received on this port
through the service provider’s network.

C.
Port A1 is connected to a device in the service provider’s network and transmits traffic to and fromthat
device.

D.
Port A1 is connected to a customer’s switch, and the switch tunnels C-VLA.N 100 traffic received on this
port through the service provider’s network.

Explanation:
First, you have to know that when QinQ is enabled, A VLAN can only be classified as an S-VLAN or a C-VLAN
at the time its created. (Regular VLAN (C-VLAN) or a tunnel VLAN (S-VLAN).)
C-VLAN can have to perceptions:
1) A regular VLAN in Mix Mode: It is used as a normal VLAN to manage Service Provider Traffic.
2) A Customer VLAN that will be tunneled via the S-VLAN assigned to the Customer.