Which of the following options is correct? (Multiple choice)

Question

Options

• ASSID technology can divide a wireless local area network into several sub-networks that require
• BBSSID is actually the MAC address of the AP, which is used to identify the BSS managed by the
• CUsers can roam under different SSIDs.
• DThe SSID in an ESS is the same, but the BSSID corresponding to each AP in the ESS is different.

• A
  72% (21)
• C
  28% (8)

Explanation

A is correct because SSIDs segment a WLAN into distinct sub-networks - each SSID can enforce its own authentication policy (e.g., a guest SSID vs. a corporate SSID on the same physical infrastructure). B is correct because the BSSID is literally the MAC address of the AP's radio interface, serving as the unique identifier for each Basic Service Set (BSS) it manages. D is correct because an Extended Service Set (ESS) is defined by multiple APs broadcasting the same SSID to enable seamless roaming, yet each AP retains its own unique BSSID (its own MAC address).

Option C is wrong because roaming only works within the same SSID. Switching to a different SSID means joining a different network entirely, which requires a fresh authentication and association - that is not roaming, it's reconnecting.

Memory tip: Think of SSID as the network's name (shared across an ESS) and BSSID as the AP's fingerprint (unique per device). Roaming = same name, different fingerprint. Different names = different networks, no roaming.

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