Given: 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 implementations?
A. Client devices ignore the TIM field and automatically send PS-Poll frames after every beacon.
B. After each beacon, the AP attempts to empty its frame buffer by sending Wake-on-WLAN frames to wake each dozing client.
C. Request-to-Send and Clear-to-Send frame exchanges are used to trigger the delivery of buffered data.
D. The Beacon interval is changed from the default 100 time units to 10 or less time units.
E. Clients send null data frames to the AP and switch the power management bit from 1 to 0 to receive queued data.
F. 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.
Given: ABC Company has hired you to perform an initial site survey of their facility. During an interview, the network manager informs you that the new wireless network must use 5 GHz bands and OFDM, and VoWiFi handsets will be used extensively over the wireless network.
What items do you need to include in the RF site survey report? (Choose 2)
A. A heat map demonstrating signal quality in areas where VoWiFi is supported.
B. Codec types and sampling rates for each VoWiFi phone
C. Security parameters and configuration steps for VoWiFi handsets.
D. Test results from an active survey with a VoWiFi handset
E. Results of DFS compliance tests for each AP
Which unit of measurement is a relative unit that is used to quantify power level changes?
A. dBm
B. dBW
C. dB
D. mW
E. VSWR
Given: Return Loss is the decrease of forward energy in a system when some of the power is being reflected back toward the transmitter.
What causes high return loss in an RF transmission system?
A. A Voltage Standing Wave Ratio (VSWR) of 1:1
B. An impedance mismatch between devices in the RF system
C. Cross-polarization of the RF signal as it passes through the RF system
D. The use of different connector types in the RF system (e.g. N-type and SMA-type)
E. Low output power at the transmitter and use of a high-gain antenna
The OSI model is a 7-layer model for understanding the functions of a communication system. What OSI sublayers are specifically addressed by the IEEE 802.11-2007 standard? (Choose 2)
A. MSDU
B. PPDU
C. PLCP
D. MAC
E. IP
F. 802.1X
The 802.11 protocol specifies a fundamental channel access method that is required for all stations and is
used in all IBSS and BSS networks.
What is this fundamental channel access method called?
A. DCF
B. PCF
C. HCF
D. EDCAF
E. HCCA
F. PCF/CA
What factor is NOT taken into account when calculating the Link Budget of a point-to-point outdoor WLAN bridge link?
A. Operating frequency
B. Transmit antenna gain
C. Transmit power
D. Antenna height
E. Receive sensitivity
F. Distance
ABC Company is planning a point-to-multipoint outdoor bridge deployment with standalone (autonomous)
802.11 bridge units. 802.1X/EAP will be used for bridge authentication. What device in the bridge implementation acts as the 802.1X Authenticator?
A. The RADIUS server
B. All non-root bridges
C. A designated non-root bridge
D. The root bridge
E. The Ethernet switch
The IEEE 802.11a/n physical layer technologies utilize the 5 GHz frequency band. What is true of the two lower bands (UNII-1 and UNII-2) in this frequency spectrum? (Choose two)
A. The frequency range of these bands is 5000 MHz - 5200 MHz
B. Each of these two bands contain five 20 MHz channels.
C. Regulatory domains worldwide require DFS and TPC in these bands.
D. These bands have a total combined bandwidth of 200 MHz.
E. 20 MHz in each of these bands is reserved as a guard band.
Given: Two co-located 802.11b/g/n APs can interfere with one another and cause contention and collisions, even when the two APs are operating on non-overlapping channels (e.g. 1 and 6).
What deployment flaw could cause this problem? (Choose two)
A. The access points are mounted too closely to one another.
B. Reflective objects in the area are causing significant multipath.
C. A client station is using active scanning to probe for access points on multiple channels.
D. The output power on the access points is too high.
E. A client station authenticates to both access points, but does not associate.
F. The access points are not synchronized to the same NTP server.
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