Which one is wrong about the WLAN Layer 2 and Layer 3 networking methods? (Multiple choice)

Question

Options

• AThe Layer 2 networking method is simple in networking and management, and is suitable for
• BIn the networking mode, the AP needs to discover the AC through unicast
• CThe three-layer network is flexible and easy to expand, and it is compatible with the complex and
• DIn the three-layer networking mode, the AP can discover the AC through broadcasting

• A
  19% (13)
• B
  71% (50)
• C
  10% (7)

Explanation

Options B and D are the wrong statements because they swap the discovery methods between Layer 2 and Layer 3 networking:

• B is wrong because in a Layer 2 (same-subnet) networking setup, the AP discovers the AC through broadcasting - not unicast. Since the AP and AC share the same broadcast domain, a broadcast reaches the AC directly without needing a known IP address.

• D is wrong because in a Layer 3 (three-layer, cross-subnet) networking setup, broadcasts cannot cross router boundaries. The AP must discover the AC via unicast (e.g., using DHCP Option 43, DNS, or a pre-configured AC IP address).

A and C are correct statements (and therefore not the answer): Layer 2 networking is indeed simple and suitable for smaller, flatter networks, while Layer 3 is flexible, scalable, and suited for large or complex enterprise environments.

Memory tip: Associate the letters with the rule - L2 = Broadcast (same LAN), L3 = Unicast (crosses routers). If a question claims the opposite pairing, it's wrong. Think: "Layer 2 broadcasts, Layer 3 goes 3-step unicast."

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