What differentiates beacon frames from probe request frames in 802.11 networks?

What differentiates beacon frames from probe request frames in 802.11 networks?

• A. Beacons are client-initiated to discover networks; Probe requests are periodical AP announcements
• B. Beacons are periodical AP announcements; Probe requests are client-initiated to discover networks
• C. Beacons are error frames; Probe requests are control frames
• D. Beacons are unencrypted; Probe requests are encrypted

Answer: (B)

Beacons and probe requests are about how devices discover wireless networks, but they operate in opposite directions and for different purposes. An access point periodically sends beacon frames to advertise its presence and capabilities, broadcasting information like the network name (SSID), supported data rates, security options, and timing. This creates a steady, beaconed map of nearby networks that any listening client can use to decide which networks to join or explore. Probe requests are frames created by clients to actively search for networks. When a device wants to find out what’s available, it sends a probe request to nearby APs, and those APs respond with probe responses that provide similar network information. This is a client-initiated way to discover networks, often used in active scanning, whereas beacons are the ongoing AP-driven announcements that make passive discovery possible. So the correct statement reflects that beacons are periodic AP announcements and that probe requests are initiated by clients to discover networks. The other choices mix up which device sends beacons, what beacons or probe requests are, or the role of encryption, which is not what distinguishes these frame types.

Beacons and probe requests are about how devices discover wireless networks, but they operate in opposite directions and for different purposes. An access point periodically sends beacon frames to advertise its presence and capabilities, broadcasting information like the network name (SSID), supported data rates, security options, and timing. This creates a steady, beaconed map of nearby networks that any listening client can use to decide which networks to join or explore.

Probe requests are frames created by clients to actively search for networks. When a device wants to find out what’s available, it sends a probe request to nearby APs, and those APs respond with probe responses that provide similar network information. This is a client-initiated way to discover networks, often used in active scanning, whereas beacons are the ongoing AP-driven announcements that make passive discovery possible.

So the correct statement reflects that beacons are periodic AP announcements and that probe requests are initiated by clients to discover networks. The other choices mix up which device sends beacons, what beacons or probe requests are, or the role of encryption, which is not what distinguishes these frame types.