What 802.11 WLAN type implements power management where stations send trigger frames to the AP after they awake from dozing?

What parameters make WMM-PS more efficient than legacy 802.11 Power Save mode? Choose 2

Given: John configures ten IEEE 802.11 dual-band ERP / OFDM laptops in a conference room for Ad Hoc wireless networking. One laptop is connected to the Ethernet network, and its Ethernet and WLAN interfaces are bridged. All ten laptops are now able to obtain an IP address from the organization’s DHCP server, resolve DNS queries, and reach web servers on the Internet. Is this WLAN an Independent Basic Service Set (IBSS) or an Infrastructure Basic Service Set (BSS)?

What statements about the Service Set Identifier (SSID) are true? Choose 2

What conditions can prevent an 802.11 client device from performing a fast BSS transition between two access points that are part of the same WLAN system? Choose 2

What steps are part of the 802.11 reassociation process? Choose 2

Which data rate is supported by 802.11 ERP-OFDM systems that is not supported by 802.11 OFDM systems?

Given: The 802.11-2007 standard often refers to Association and Reassociation frames as a set by saying, "(Re)Association."
What is one difference between these two frame types?

Devices compliant with the IEEE 802.11-2007 standard use which radio bands? Choose 3

What OSI model layers are specifically addressed by the IEEE 802.11-2007 standard? Choose 2