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QUESTION NO: 1
What HT PPDU format is shown in the exhibit?
A. HT-mixed format
B. HT-greenfield format
C. Non-HT format
D. Non-HT duplicate format
E. Dual Training Field format
F. ERP-OFDM format
Answer: A
QUESTION NO: 2
What is the purpose of a PHY preamble?
A. It provides the receiver(s) with an opportunity for RF channel synchronization prior to the start of the PLCP header.
B. It communicates important information about the PSDU’s length, rate, and upper layer protocol- related parameters.
C. It provides a cyclic redundancy check (CRC) for the receiving station to validate that the PLCP header was received correctly.
D. It indicates to the PHY the modulation that shall be used for transmission (and reception) of the PSDU.
Answer: A
QUESTION NO: 3
When a 5 GHz HT station in a 40 MHz BSS desires to protect a 40 MHz transmission from an OFDM station using an RTS/CTS or CTS-to-Self exchange, what frame format is used for the RTS and/or CTS frames?
A. HT-mixed format
B. HT-greenfield format
C. Dual-CTS
D. Non-HT Duplicate
E. Phased Coexistence PPDU
Answer: D
QUESTION NO: 4
What IEEE 802.11 technology is illustrated by the exhibit?
A. Fragmentation
B. TCP Fragment Bursting
C. A-MSDU
D. A-MPDU
E. U-APSD
F. Jumbo frames Answer: C
QUESTION NO: 5
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
Answer: B,C,F
QUESTION NO: 6
Using the exhibit as a reference, answer the following.
STA1 sent a data frame to Mesh AP2 destined for a local file server on the same subnet with MAC address 00:11:22:33:44:55. Mesh AP2’s mesh forwarding algorithm determined that the frame should be forwarded through Mesh AP1.
In the frame sent from Mesh AP2 to Mesh AP1, what is true of the contents of the MAC header? (Choose 3)
A. SA = Mesh AP2’s MAC Address
B. RA = Mesh AP1’s MAC Address
C. TA = STA1’s MAC Address
D. DA = 00:11:22:33:44:55
E. To DS = 0
F. From DS = 1
Answer: B,D,F
QUESTION NO: 7
According to 802.11-2007, in what frame type(s) might you find the PMK Count and PMKID List fields?
A. All frames that include the RSN IE
B. Only (Re)Association Request frames
C. Beacon and Probe Response frames
D. EAPoL 4-Way Handshake frames
E. Authentication and Association Request and Response frames
Answer: B
QUESTION NO: 8
Which statement is true regarding the Association Identifier (AID) used in IEEE 802.11 WLANs?
A. The AID has a maximum value of 2048, and is used to uniquely identify a wireless client station associated with an access point.
B. The AID has a maximum value of 2007, and resides in the duration/ID field of a PS-Poll frame.
C. The client station is assigned an AID value in the 802.11 authentication response frame.
D. The AID field is present only in Beacons frames.
E. The AID is used by the access point in EDCA mode to reduce duplicate transmissions when sending multicasts.
Answer: B
QUESTION NO: 9
In which 802.11 frames is the SSID present, provided the SSID is not removed through proprietary software configuration by an administrator? (Choose 3)
A. Association Request
B. Reassociation Request
C. Probe Response
D. Disassociation
E. Authentication
F. Association Response
Answer: A,B,C
QUESTION NO: 10
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.
Answer: A
QUESTION NO: 11
Given the frame capture and the decode shown,
after which Beacons in the list shown (as indicated by the frame number in the leftmost column) would multicast traffic have been sent in this infrastructure BSS if multicast traffic had been queued for transmission at the access point? (Choose 2)
A. Framenumber 49
B. frame number 50
C. frame number 51
D. frame number 53
E. frame number 54
F. frame number 55
G. frame number 57
Answer: C,F
QUESTION NO: 12
The Retry subfield is found in which IEEE 802.11 frame field?
A. Sequence Control field
B. Protocol Order field
C. Data Control field
D. Frame Control field
E. MAC Service Data Unit field
F. QoS Control field
Answer: D
QUESTION NO: 13
Which information elements (IE) are contained in an IEEE 802.11 Probe Request frame? (Choose 2)
A. RSN IE
B. SSID
C. Status code
D. Association ID
E. Supported rates
Answer: B,E
QUESTION NO: 14
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.
Answer: D QUESTION NO: 15
Which parameters accurately describe the Beacon Interval field in the Beacon frame? (Choose 2)
A. Value can range from 0 to 2007
B. 4-octet length
C. Indicates the exact time interval between Beacon transmissions
D. Indicates the desired time interval between TBTTs
E. Measured in time units of 1024 μs
Answer: D,E
QUESTION NO: 16
The IEEE 802.11 Dynamic Frequency Selection (DFS) service is capable of performing what functions? (Choose 2)
A. Establishing an interference baseline on all 2.4 GHz channels
B. Using modulation switching techniques to avoid interfering with radar systems
C. Testing channels for radar before using a channel and while operating in a channel
D. Suspending operations on a channel with high IEEE 802.11 co-channel interference
E. Requesting and reporting of measurements in the current and other channels
Answer: C,E
QUESTION NO: 17
Which statements regarding an IEEE 802.11 Channel Switch Announcement frame are true? (Choose 2)
A. Channel Switch Announcement frames use the Action frame body format.
B. Channel Switch Announcement frames are the only place where the Channel Switch Announcement element is found.
C. Channel Switch Announcement frames are transmitted and retransmitted on a channel until all associated STAs successfully move to the new channel.
D. Channel Switch Announcement elements may be carried in Beacon management frames.
E. In an infrastructure BSS, Channel Switch Announcement frames may be transmitted by either the AP or an associated STA.
Answer: A,D
QUESTION NO: 18
An HT STA does not receive an ACK for a first-attempt data frame that it transmitted. Assuming this STA is not using BlockAcks in this case, what happens to the HT STA’s EDCA contention window?
A. The slot time within the contention window decreases by 50%.
B. It varies because the backoff algorithm is random.
C. The contention window approximately doubles in size.
D. The contention window is not affected by failed Data frame delivery.
E. The contention window is immediately closed, and the frame is retransmitted.
Answer: C
QUESTION NO: 19
What two IEEE 802.11 entities may be used to separate successful transmissions within an EDCA TXOP? (Choose 2)
A. SIFS
B. AIFS
C. ACK
D. CAP
E. PIFS
F. EIFS
G. RIFS
Answer: A,G
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