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 statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE
802.11 WLANs?
A. 802.11a and 11n use six (6) "pilot" subcarriers as a reference for the receiver to detect frequency and phase shifts of the signal.
B. 802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data rates from 1-600 Mbps.
C. With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon coding rates.
D. 802.11n HT-OFDM utilizes 256-QAM, which increases the data rate from 54 Mbps (with 64-QAM) up to 65 Mbps.
E. In 802.11a OFDM, forty-eight (48) subcarriers are used as parallel symbol transmission paths to carry data.
What distinguishes an independent basic service set (IBSS) from an infrastructure basic service set (BSS)?
A. An IBSS does not have a distribution system (DS), but a BSS does.
B. An IBSS does not require beacon frames, but a BSS does.
C. An IBSS does not support 802.11 authentication or association, but a BSS does.
D. An IBSS can only operate on a single channel, but a BSS can operate on multiple channels.
What term describes the effect of increasing the intensity of an RF wave with an antenna by focusing the energy in a specific direction?
A. Spatial Multiplexing
B. Active Amplification
C. Beam Compression
D. Passive Gain
E. Isotropic Radiation
When planning an access point deployment that utilizes Power over Ethernet (PoE) switches at the network edge, what design decision could adversely affect the operation of 802.3af APs?
A. All ports on the Ethernet switch will be supporting Class 3 PoE powered devices.
B. Some APs are connected to a PoE switch and are also receiving power from an AC outlet.
C. The Ethernet switch's uplink ports are not connected to an 802.3af-compliant core or distribution Ethernet switch.
D. A gigabit Ethernet switch port supporting an 802.11a/g AP auto-negotiates to 100 Mbps.
E. The installation team is not informed that PoE support will reduce the recommended maximum UTP cabling length from 100m to 50m.
Which IEEE 802.11 physical layer (PHY) specifications include support for and compatibility of both OFDM and HR/DSSS? (Choose 2)
A. HR/DSSS (802.11b)
B. OFDM (802.11a)
C. ERP (802.11g)
D. HT (802.11n)
E. CCK (802.11b)
F. PBCC (802.11g)
What problems may exist for a multiple channel architecture (MCA) WLAN when its APs are all operating at full power (typically 100mW)? (Choose two)
A. Wi-Fi enabled voice handsets with low transmit power can experience asynchronous downlink and uplink performance.
B. WLAN client stations can experience the hidden node problem when located near each other within the same cell.
C. The mismatched power between WLAN client stations and APs violates regulatory and IEEE signal quality requirements.
D. Cell size may be too large, causing co-channel interference to adjacent cells and reducing system capacity.
E. APs operating in the 2.4 GHz band would prevent microwave ovens and analog video cameras from functioning.
What problems may occur when there are hidden nodes in the BSS?
A. Increase in downlink (transmitted by AP) frame retries
B. High retransmission count for a subset of client stations
C. Use of frame fragmentation with fragment bursts
D. Excessive use of null data frames
E. Duration values vary widely in each data frame
How is throughput capacity scaled in a single channel architecture (SCA) WLAN system?
A. By increasing transmit power and placing APs that are on a single channel farther from one another.
B. By adding more SSIDs to existing APs to spread users across different contention domains.
C. By adding APs to increase the number of non-overlapping channel layers.
D. By using downlink data compression and uplink flow control at the AP.
E. By using a single 802.11n radio to transmit simultaneous downlink data streams to different users.
What phrase defines Equivalent Isotropically Radiated Power (EIRP)?
A. Radio transmitter output power minus attached cable and connector loss
B. Radio transmitter output power only
C. Power supplied to the transmit antenna input plus antenna gain
D. Reflected power due to an impedance mismatch in the signal path
E. Power supplied from the transmission line to the antenna's input
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