You manage your company enterprises network using EX series switches. Your company wants to
use Q-in-Q tunneling to connect remote customer sites together. Which statement is correct about
the scenario?
A.
You must enable L2PT to tunnel Layer 2 protocol traffic.
B.
The outside Layer 2 frame is popped by the penultimate switch.
C.
Customer traffic is tunneled through the network using the C VLAN ID.
D.
The default Ethernet value is 0x9100.
Could anyone explain why A is correct? I am not clear the relationship between L2PT and QinQ. Thanks
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I think the correct answer is C according to https://en.wikipedia.org/wiki/IEEE_802.1ad
– The inner tag is the tag which is closest to the payload portion of the frame; it is officially called C-TAG (Customer tag, with ethertype 0x8100).
– The outer tag is the one closer/closest to the Ethernet header; its name is S-TAG (Service tag, ethertype 0x88a8)
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The c-vlan id is part of frame, therefore c-vlan tag is part of customer trafic. Customer traffic is tunneled through the network using the S-VLAN ID.
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