Which one does the roaming of terminals in different VLANs belong to?

Question

Options

• ASeamless AP roaming
• BLayer 2 Roaming
• CLayer 3 Roaming
• DLayer 4 Roaming

• A
  11% (4)
• B
  3% (1)
• C
  80% (28)
• D
  6% (2)

Explanation

Layer 3 Roaming (C) is correct because roaming between different VLANs means the terminal is crossing subnet boundaries. VLANs map to different IP subnets, so when a device moves from one VLAN to another, it must obtain a new IP address - a Layer 3 (network layer) operation.

Layer 2 Roaming (B) is wrong because it describes movement between access points within the same VLAN and subnet, where the IP address stays the same and only the Layer 2 association changes. Seamless AP roaming (A) is a broader concept referring to smooth, uninterrupted handoffs between access points, but it does not specifically describe cross-VLAN movement. Layer 4 Roaming (D) does not exist as a defined standard; Layer 4 (TCP/UDP) has no roaming mechanism.

Memory tip: Match the layer to what changes. Same VLAN, different AP = Layer 2 roaming (MAC-level handoff). Different VLAN = different subnet = IP address must change = Layer 3 roaming.

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