What component of the 802.11 standard allows stations to reserve access to the RF medium for a specified period of time?

A. Long slot times

B. DTIM Interval

C. Listen Interval

D. Probe Request frames

E. RTS or CTS frames

As a consultant, you've been hired by XYZ Company to provide recommendations about client device selection, operation, and interoperability. What information should be considered to help them choose the right WLAN client devices?

A. 802.11n OFDM is more susceptible to high-power, narrowband interference than 802.11a OFDM.

B. In order to earn Wi-Fi Alliance certification, 802.11n clients stations are required to support both 2.4 and 5 GHz frequencies

C. 802.11a/g devices may support WMM, but all 802.11n devices are required to support WMM.

D. An 802.11g/n AP that is configured to support only OFDM data rates will allow HR/DSSS devices to associate.

E. When HR/DSSS devices are present, HT MCS rates are disabled for the entire BSS.

The client devices that connect to your network include a mix of dual-band 802.11n, single-band 802.11b/ g, and some 802.11a/g. Your access points are configured with the same SSID on both the 2.4 and 5 GHz bands. The APs are also configured to prioritize client connectivity to 5 GHz. How does an AP perform band steering to encourage clients to use 5 GHz?

A. When the client sends a probe request in the 2.4 GHz band, the AP may reply with information about the 5 GHz BSS.

B. The AP may ignore the initial probe requests or 802.11 authentication requests sent in the 2.4 GHz band by dual-band clients

C. The AP may allow an 802.11 association with the client in the 2.4 GHz band, then send unicast channel switch announcements to the client announcing the 5 GHz channel as the new channel.

D. After receiving probe request frames from the same client in both bands, the AP may send an association request frame to the client in the 5 GHz band.

E. The AP may allow an 802.11 association with the client in the 2.4 GHz band, then the AP may perform a transparent client handoff by transferring the client's MAC address to the 5 GHz radio.

What can cause an excessively high VSWR (Voltage Standing Wave Ratio) in a WLAN RF transmission line?

A. An impedance mismatch in the RF cables and connectors

B. Reflected direct current (DC) voltage on the main RF signal line

C. Attenuation of the RF signal as it travels along the main signal path

D. Crosstalk (inductance) between adjacent RF conductors

What three cipher suites are specified by the IEEE 802.11-2007 standard? (Choose three)

A. Counter Mode with CBC-MAC Protocol

B. Wi-Fi Protected Access v1 and v2

C. Internet Protocol Security

D. Extensible Authentication Protocol

E. Internet Key Exchange v2

F. Wired Equivalent Privacy

G. Temporal Key Integrity Protocol