When the AC has only one interface connected to the aggregation layer switch, and user traffic goes out of the public network directly through the aggregation layer switch and does not flow through…

Question

Options

• ABypass mode + tunnel forwarding
• BBypass mode + direct forwarding
• CDirect connection mode + tunnel forwarding
• DDirect connection mode + direct forwarding

• A
  3% (1)
• B
  80% (24)
• C
  10% (3)
• D
  7% (2)

Explanation

Option B is correct because bypass mode describes the topology where the AC connects to the network through a single interface on the aggregation switch, placing it outside the main data path. Direct forwarding (also called local forwarding) means user traffic is switched locally by the aggregation switch and never sent up through the AC, which matches the scenario exactly.

Option A is wrong because tunnel forwarding encapsulates all user traffic and sends it to the AC for processing, which would force traffic through the AC - directly contradicting the stated requirement. Option C is wrong because direct connection mode means the AC sits inline with two interfaces (one upstream, one downstream), making it a mandatory transit point for traffic, which is the opposite of the described topology. Option D fails for the same topological reason as C: direct connection mode places the AC in-path regardless of the forwarding method used.

Memory tip: Pair the two halves logically. If traffic bypasses the AC physically (bypass mode, one interface), it must also bypass it in the data plane (direct forwarding). Whenever you see "traffic does not flow through the AC," both the mode and the forwarding type must reflect that absence - bypass + direct.

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