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Wireless Standards And Protocols Test For Beginners!

This beginner-level test on Wireless Standards and Protocols assesses knowledge of WLAN troubleshooting, power save behaviors, and IEEE 802.11 standards. It is designed to enhance understanding of beacon frame behaviors, power...

Questions: 180 | Attempts: 414 | Last updated: Mar 21, 2023

Sample Question 1
As XYZ Company’s wireless specialist, you have been asked to troubleshoot some unexpected frame patterns in a wireless protocol capture. Your peers explain that the network’s beacon frames are inconsistent. That is, the BSSID is the same for all beacons, but the source address varies between three different addresses. What network configuration would cause this beacon frame behavior?

A single AP supports multiple BSSs with different SSIDs

The beacons are from an IBSS instead of a BSS

A virtual cell single channel network has been implemente

Three APs still share the same default configuration.

Sample Question 2
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?

VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.

Legacy Power Save mode was removed in the 802.11ac amendment

VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.

VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.

Sample Question 3
As defined in the 802.11 specification, legacy Power Save requires an inefficient back-and-forth frame exchange process. Due to this inefficiency, many WLAN device implementations use a variation of 802.11 Power Save to accomplish the same function. What non-standard power save behavior is used by most Wi-Fi devices in actual legacy Power Save implementations?

Client devices ignore the TIM field and automatically send PS-Poll frames after every beacon

Clients send null data frames to the AP and switch the power management bit from 1 to 0 to receive queued data.

After each beacon, the AP attempts to empty its frame buffer by sending Wake-on-WLAN frames to wake each dozing client

Request-to-Send and Clear-to-Send frame exchanges are used to trigger the delivery of buffered data.

The Beacon interval is changed from the default 100 time units to 10 or less time units.

Stations send a CTS-to-self frame to the AP with a very long duration period so they can receive all of their buffered data at once.