If the VLAN IDs of the two subnets before and after the user roams are the same, then the user's roaming between the two subnets is considered Layer 2 roaming.

Question

Options

• ATrue
• BFalse

• A
  15% (8)
• B
  85% (45)

Explanation

Option B is correct because Layer 2 roaming is defined by whether the user remains within the same IP subnet, not by whether the VLAN IDs match. VLAN IDs are a Layer 2 construct, but the same VLAN ID can be configured across different physical or logical network segments that map to entirely different IP subnets - meaning a matching VLAN ID alone is insufficient evidence of Layer 2 roaming.

Option A (True) is wrong because it conflates VLAN ID identity with subnet continuity. In enterprise wireless networks, VLAN IDs can be reused across different network domains; a client crossing into a different subnet triggers Layer 3 roaming regardless of VLAN numbering. The question itself even specifies "two subnets," which by definition implies different IP networks - making the roaming Layer 3.

Memory tip: Think of the layer number as telling you where the boundary is - Layer 2 roaming = no IP change (same subnet stays, MAC-level handoff), Layer 3 roaming = IP changes (subnet crossed). VLAN IDs describe broadcast domains, not roaming type - don't let matching numbers fool you.

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