Which statements are true regarding Beacons from an AP in an HT infrastructure BSS that is configured with multiple WLAN profiles? (Choose 3)
A. Beacons can be disabled for security purposes.
B. The BSSID and Source Address are always the same.
C. The Destination Address is always FF:FF:FF:FF:FF:FF.
D. The Receiver address and the BSSID are always the same.
E. When the SSID is "hidden," the ESS subfield of the Capability Information field distinguishes one BSS from another.
F. All Beacons generated by APs contain a TIM information element.
G. The Beacon interval must be the same for all WLANs (SSIDs) supported by a single AP
In the frame decode shown, there are two sets of supported data rates. 1, 2, 5.5, and 11 Mbps are all shown as "basic" data rates, and 6, 9, 12, 18, 24, 36, 48, and 54 Mbps are shown simply as supported data rates.
What is true of "basic" data rates in this context?
A. The AP requires all client stations to support Basic rates in order to associate to its BSS.
B. The highest data rate set to Basic is automatically used to send broadcast traffic such as Beacon frames.
C. Basic rates are optional data rates for the BSS, often used for assuring connectivity for legacy stations.
D. Basic rates are only used for multicast traffic, and do not affect unicast traffic.
E. Basic rates are defined in an AP's service set to specify mandatory data rates for all retry frames.
According to the IEEE 802.11 standard, what is one structural difference between a MAC Protocol Data Unit (MPDU) and a MAC Management Protocol Data Unit (MMPDU)?
A. The MPDU frame's FCS field is 4 bytes, while the MMPDU frame's FCS field is 8 bytes.
B. The MMPDU frame body is limited to 300 bytes, whereas the MPDU frame body can carry up to 2304 bytes.
C. The MPDU header always places the BSSID in the first address field, but in the MMPDU the BSSID can be found in any of the address fields.
D. An MMPDU header may only contain three address fields, but an MPDU may have four address fields.
E. Both the MPDU and MMPDU have a QoS Control (QC) field, but all bits of the MMPDU's QC field are always 0.
Which statements are true regarding wireless network discovery and scanning processes for an HT network? (Choose 2)
A. Client stations may continually send Probe Request frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner, regardless of their association state.
B. Access points send Beacon frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner including the channel for which the access point is configured.
C. Client stations send Probe Request frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner until they associate with an access point. After associating to an access point, they no longer transmit Probe Request frames.
D. Access points send Beacon frames only on the HT channel in the 2.4 GHz ISM band for which the access point is configured, and only after scanning that channel to discover existing BSSs.
E. Client stations send Probe Request frames on all HT channels in the 2.4 GHz ISM band in a consecutive manner until they receive at least 3 Probe Response frames.
To effect Preauthentication, a STA's supplicant sends an IEEE 802.1X/EAPoL Start message. How is the EAPoL Start message addressed?
A. DA = MAC of default gateway; RA = BSSID of the AP to which the STA is associated
B. DA = BSSID of targeted AP; RA = BSSID of the AP to which the STA is associated
C. DA = MAC of the default gateway; RA = Ethernet MAC of the targeted AP
D. DA = BSSID of the targeted AP; RA = Ethernet MAC of the targeted AP
IEEE 802.11-2007 specifies two ERP protection mechanisms: RTS/CTS and CTS-to-Self. Which statement is true regarding these two protection mechanisms? (Choose 2)
A. RTS and CTS frames use Short Interframe Spaces (SIFS), and CTS-to-Self frames use PCF Interframe Spaces (PIFS).
B. Use of RTS/CTS requires more overhead than CTS-to-Self due to a higher number of frames transmitted onto the wireless medium.
C. RTS and CTS frames are relayed through the access point, whereas the CTS-to-Self frames are not.
D. A CTS-to-Self frame sent by a client station may reach fewer nodes than the RTS/CTS frame exchange.
E. By definition, all associated client stations in a BSS can hear RTS, CTS, and CTS-to-Self frames, so RTS/CTS and CTS-to-Self mechanisms have equal effectiveness.
F. Aside from the Subtype subfield of the Frame Control field, the generic MAC header format of RTS and CTS frames are identical.
As it pertains to HT L-SIG TXOP Protection, what statement is true?
A. Support for L-SIG TXOP Protection is indicated by HT stations in the L-SIG field of the PLCP header of HT-mixed format frames.
B. Support for L-SIG TXOP Protection is indicated in the HT Capabilities Info field of (re)association request frames sent by ERP, OFDM, and HT-OFDM stations.
C. An L-SIG TXOP protected frame exchange sequence always begins with an RTS/CTS or a CTS-to- Self.
D. L-SIG TXOP Protection is specified for the purpose of protecting OFDM (802.11a/g) and HT- OFDM (802.11n) transmissions from HR/DSSS stations.
With what access category's parameters are WLAN multicast video frames transmitted when the EDCAF is in use by the transmitting station?
A. AC_VI
B. AC_VO
C. AC_BE
D. AC_BK
ABC Company's WLAN administrator is getting complaints from one user that his WLAN throughput is sluggish compared to other users in his area. The administrator takes his diagnostics laptop, which has a wireless protocol analyzer installed, to the area where the complaining user works. The administrator uses the PING utility to test connectivity from the complaining user's wireless client station to another wireless client station across the closest access point, while capturing the wireless frames. The administrator sees what is displayed in this screenshot.
From this screenshot, which statements can you conclude to be TRUE that are related to the complaining user's throughput problem? (Choose 2)
A. The complaining user's WLAN client utilities are configured with a small fragmentation threshold.
B. The complaining user's station is retransmitting fragments many times likely due to nearby RF interference.
C. The access point and other stations are using ERP-OFDM modulation, and the complaining user's wireless client station is using HR/DSSS modulation.
D. The complaining user's wireless client station should be using RTS/CTS as a protection mechanism, but it is not.
E. The access point is not signaling for protection (Protection = no) in the Beacons, but it should be.
When 802.11 standard compliant AES-CCMP security is being used with IPSec/ESP for layered security, what will a WLAN protocol analyzer see as the security mechanism in use when a user browses to an HTTPS secured web page?
A. AES-CCMP
B. IPSec/ESP
C. SSLv3
D. AES-CCMP and IPSec/ESP
E. AES-CCMP, IPSec/ESP, AND SSLv3
