What phrase defines Equivalent Isotropically Radiated Power (EIRP)?
A. Power supplied from the transmission line to the antenna input
B. The power output from the radio after cable losses
C. The power output from the radio into the RF cable
D. The highest RF signal strength that is transmitted from a given antenna
You administer a small WLAN with nine access points. As a small business, you do not run a RADIUS server and use WPA2-Personal for security. Recently, you changed the passphrase for WPA2-Personal in all APs and clients. Several users are now reporting the inability to connect to the network at times and it is constrained to one area of the building. When using a WLAN scanner, you see that the AP covering that area is online and has a strong signal. No other changes have been made to the environment and all access points are the same model. What is the likely problem?
A. The AP that covers the problem area requires a firmware update
B. The clients are improperly configured
C. The AP that covers the problem area has failed
D. The AP that covers the problem area is improperly configured
An RF signal sometimes bends as it passes through some material other than free space. What is the term that describes this behavior?
A. Refraction
B. Warping
C. Scattering
D. Reflection
Which directional antenna types are commonly used by indoor Wi-Fi devices in a MIMO multiple spatial stream implementation?
A. Dipole and yagi
B. Grid and sector
C. Patch and panel
D. Dish and grid
What factor is likely to cause the least impact on the application layer throughput of an 802.11n client station in a 2.4 GHz HT BSS?
A. Increasing or decreasing the number of spatial streams in use by the client station and AP
B. Implementing Fast BSS Transition (FT) for roaming
C. Implementation of several other clients in the same BSS using 802.11g radios
D. RF interference from more than 10 nearby Bluetooth transmitters
What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) modulation method in IEEE 802.11 WLANs?
A. OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
B. OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
C. OFDM modulation is used only in 5 GHz 802.11 transmissions.
D. OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
What ID is typically mapped to an AP's MAC address if a single BSS is implemented?
A. SSID
B. Device ID
C. VLAN ID
D. BSSID
You manage a WLAN with 100 802.11ac access points. All access points are configured to use 80 MHz channels. In a particular BSS, only 40 MHz communications are seen. What is the likely cause of this behavior?
A. All clients implement single spatial stream radios
B. The clients are all 802.11n STAs or lower
C. The AP is improperly configured to use only 40 MHz of the 80 MHz allocated bandwidth
D. The short guard interval is also enabled
When compared with legacy Power Save mode, how does VHT TXOP power save improve battery life for devices on a WLAN?
A. Legacy Power Save mode was removed in the 802.11ac amendment.
B. VHT TXOP power save allows the WLAN transceiver to disable more components when in a low power state.
C. VHT TXOP power save uses the partial AID in the preamble to allow clients to identify frames targeted for them.
D. VHT TXOP power save allows stations to enter sleep mode and legacy Power Save does not.
The requirements for a WLAN you are installing state that it must support unidirectional delays of less than 150 ms and the signal strength at all receivers can be no lower than -67 dBm. What application is likely used that demands these requirements?
A. VoIP
B. E-Mail
C. FTP
D. RTLS
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