If roaming is implemented between two APs, which of the following conditions must be met? (Multiple choice)

Question

Options

• ASame security policy
• BSame SSID
• CThe same data forwarding mode
• DThe same service VLAN

• A
  75% (27)
• D
  25% (9)

Explanation

For roaming to work between two APs, the client must be able to find, authenticate to, and exchange data through both APs using the same fundamental parameters. Same SSID (B) is required because clients identify and discover networks by their SSID -- different SSIDs appear as entirely separate networks, so no automatic roaming would occur. Same security policy (A) is required because mismatched authentication or encryption methods (for example, WPA2-PSK on one AP and WPA2-Enterprise on the other) would prevent the client from re-authenticating during the roam. Same data forwarding mode (C) is required in enterprise WLAN architectures (such as Huawei's AC/AP model) because mixing tunnel forwarding and direct forwarding between APs breaks the continuity of the data path.

Option D is incorrect because the service VLAN does not have to match -- roaming can function across APs assigned to different VLANs, though the client may receive a new IP address in such cases, which is handled at a higher layer and is not a roaming prerequisite at the wireless level.

Memory tip: Remember "SSF" -- Same SSID, Same Security, Same Forwarding. Those three align the discovery, authentication, and data path that roaming depends on.

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