As shown in the figure, data traffic is forwarded in tunnel mode along the path of STA - > HAP - > HAC - > upper-layer network before roaming. What is the flow direction of data traffic after Layer 3 roaming?
A.
STA - > FAP - > FAC - > HAC - > HAP - > HAC - > Upper-layer network
B.
STA - > FAP - > FAC - > HAC - > Upper-layer network
C.
STA - > FAP - > FAC - > Upper-layer network
D.
STA - > FAP - > FAC - > HAC - > HAP - > Upper-layer network
After Layer 3 roaming, the STA’s traffic is forwarded from the Foreign AP (FAP) to the Foreign AC (FAC), and then to the Home AC (HAC) before reaching the upper-layer network. This ensures that the STA remains on the same subnet without breaking existing sessions .
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