CWS CWS Wi-Fi Service Sets 3 — Questions and Answers
Question 1: A single AP supports multiple SSIDs simultaneously. What is each additional SSID typically mapped to?
- A separate physical radio
- A separate VLAN on the wired network (Correct answer)
- A separate IP subnet per client
- A separate BSSID on a different channel
Correct answer: A separate VLAN on the wired network
Each SSID on a multi-SSID AP is typically mapped to a unique VLAN on the wired (DS) side to logically separate traffic.
Question 2: What happens to beacon frames when an administrator enables 'hidden SSID' (SSID suppression)?
- Beacons stop transmitting entirely
- Beacons are sent but the SSID field contains a null or empty value (Correct answer)
- Beacons are encrypted with WPA3
- Beacons are replaced by probe responses only
Correct answer: Beacons are sent but the SSID field contains a null or empty value
With hidden SSID enabled, the AP still sends beacons but the SSID element is set to zero-length (null), hiding the network name.
Question 3: In a mesh Wi-Fi deployment, what type of service set is formed between the mesh nodes themselves?
- BSS
- ESS
- IBSS
- MBSS (Correct answer)
Correct answer: MBSS
An MBSS (Mesh Basic Service Set) is the IEEE 802.11s service set formed among mesh nodes (MPs) for multi-hop wireless backhaul.
Question 4: Which frame type does a client use to actively discover SSIDs by broadcasting a request?
- Association request
- Probe request (Correct answer)
- Authentication request
- Beacon
Correct answer: Probe request
A probe request is sent by a client to actively scan for available SSIDs; APs respond with probe responses.
Question 5: An ESS is defined by multiple BSSes connected through which element?
- A common BSSID
- The Distribution System (DS) (Correct answer)
- A shared encryption key
- A common channel
Correct answer: The Distribution System (DS)
The Distribution System (DS) interconnects the BSSes, and the shared SSID ties them together into an ESS.
Question 6: What is the maximum number of SSIDs most enterprise APs support per radio, as a practical standard?
- 4
- 8
- 16 (Correct answer)
- 32
Correct answer: 16
Most enterprise-grade APs support up to 16 SSIDs per radio, though using many simultaneously degrades airtime efficiency.
Question 7: A client is associated to an AP in infrastructure mode. Which service set type describes this relationship?
- IBSS
- MBSS
- BSS (Correct answer)
- ESS
Correct answer: BSS
A single AP and its associated clients form a BSS (Basic Service Set) operating in infrastructure mode.
CWS CWS Wi-Fi Service Sets 3
A single AP supports multiple SSIDs simultaneously.
What is each additional SSID typically mapped to?