In the WLAN networking shown in the figure, STA roams between WACs. The data forwarding mode of the two WACs in the figure is tunnel forwarding. The gateways of the service VLAN are both located on…

Question

Exhibit

Options

• ASTA->AP2->WAC2->WAC1->Switch1->AR1>Internet
• BSTA->AP2->WAC2->Switch1->AR1->Internet
• CSTA->AP2->WAC2->WAC1->AP1->Switch1->AR1->Internet
• DSTA->AP2->WAC2->WAC1->AP1->WAC1->Switch1->AR1->Internet

• A
  3% (1)
• B
  84% (32)
• C
  8% (3)
• D
  5% (2)

Explanation

Option B is correct because with tunnel forwarding and the default home agent configuration in Huawei WLAN, the foreign WAC (WAC2) does not establish a tunnel back to the home WAC (WAC1) after inter-WAC roaming. Instead, WAC2 decapsulates the CAPWAP-tunneled traffic from AP2 and forwards it directly to the service VLAN gateway on Switch1, then onward to AR1 and the Internet.

Option A is wrong because WAC2→WAC1 routing only occurs when the home agent function is explicitly enabled on WAC1 - the default configuration does not activate this inter-WAC tunnel, so traffic never detours through WAC1.

Options C and D are wrong because once the STA roams to AP2, AP1 (under WAC1's domain) is completely out of the data path - AP1 has no role in forwarding traffic for a STA it is no longer serving.

Memory tip: Think "default = direct." When the home agent is at its default (off/inactive), the foreign WAC takes the shortest path straight to the gateway - no U-turn back to the home WAC required.

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