The following is true about a personal basic service set (PBSS) WLAN topology:

	a.	A PBSS can be established only between 802.11ad client stations that supports directional multi-gigabit (DMG) radios operating at the 60 GHz frequency band.
	b.	A PBSS can be established only between 802.11ac client stations that supports directional multi-gigabit (DMG) radios operating at the 60 GHz frequency band.
	c.	A PBSS can be established only between 802.11ad client stations that supports directional multi-gigabit (DMG) radios operating at the 5 GHz frequency band.
	d.	A PBSS can be established only between 802.11ac client stations that supports directional multi-gigabit (DMG) radios operating at the 5 GHz frequency band.
	e.	Non of the given selections is true.

During the discovery and connectivity process, client and AP stations exchange information about their supported data rates. After the association, how do the client and AP stations select the supported data rate that will be used to send an 802.11 data frame?

	a.	During the association, the client and AP agree to use the same transmit rate, but either station can request a change at any time after the association.
	b.	The client and AP each choose the optimal data rate to use independently of one another, based on their measurements related to the RF link.
	c.	The client and AP may use different transmit rates, but the transmit rate is determined by the peer station, based on the peer's experience of the RF link.
	d.	The client and AP may use different transmit rates, but the AP determines the data rate that will be used by each client station in the BSS.
	e.	The client and AP may use different transmit rates, but the client determines the data rate that it will use and the data rate that the AP will use when communicating to the client.

The following specifications are true about the IEEE802.11n WiFi mode:

	a.	2.4/5 GHz operation bands, supports up to 600 Mbps data rates, uses ERP-OFDM spread spectrum technology, uses MIMO radios, and is backward compatible with the b and g WiFi amendments.
	b.	2.4/5 GHz operation bands, supports up to 600 Mbps data rates, uses HT-OFDM spread spectrum technology, uses MIMO radios, and is backward compatible with the a, b, and g WiFi amendments.
	c.	2.4/5 GHz operation bands, supports up to 600 Mbps data rates, uses HT-OFDM spread spectrum technology, uses SISO radios, and is backward compatible with the a, b, and g WiFi amendments.
	d.	2.4 GHz operation band, supports 1 and 2 Mbps data rates, uses OFDM spread spectrum technology, uses SISO radios, and is not backward compatible with the previous WiFi amendments.
	e.	5 GHz operation band, supports up to 6.93 Gbps data rates, uses VHT-OFDM spread spectrum technology, uses MIMO radios, and is backward compatible with all previous WiFi amendments.

An industrial vendor has recently introduced a brand new device for wireless telecommunications providing access to the Internet. The following organization has tested the device and provided certification of interoperability approval:

	a.	The Internet Engineering Task Force (IETF)
	b.	The Institute of Electrical and Electronics Engineers (IEEE)
	c.	The International Telecommunication Union Radiocommunication Sector (ITU-R)
	d.	Inter-American Telecommunication Commission (CITEL)
	e.	The Wi-Fi Alliance

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?

	a.	The Beacon interval is changed from the default 100-time units to 10 or less than 10-time units.
	b.	Request-to-Send and Clear-to-Send frame exchanges are used to trigger the delivery of buffered data.
	c.	After each beacon, the AP attempts to empty its frame buffer by sending Wake-on WLAN frames to wake each dozing client.
	d.	Clients send null data frames to the AP and switch the power management bit from 1 to 0 to receive queued data.
	e.	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.
	f.	Client devices ignore the TIM field and automatically send PS-Poll frames after every beacon.

An 802.11 WLAN transmitter that outputs a 40 mW signal is connected to a cable with 3 dB of loss. The cable is connected to an antenna with 15 dBi of gain. What is the EIRP power?

	a.	2.8 dBm
	b.	6310 mW
	c.	34 dBm
	d.	280 dBm
	e.	631 mW