CWNP-Certified Wireless Analysis Professional (CWAP)

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CWNP-Certified Wireless Analysis Professional (CWAP)

Which set of statements about Spanning Tree Protocol default timers is true?

When frames collide within a QoS STA, data frames from lower priority ACs behave (as it relates to
contention) as if there were an external collision on the wireless medium. Collisions between contending EDCAFs within a QoS STA are resolved within the QoS STA When a frame transmission on the wireless medium fails, the transmitter may not transmit anotherframe from any AC or to any destination until the frame experiencing a failure is successfully transmitted
or the max retry count for that frame is reached. The WMM specification requires use of RTS/CTS as part of the EDCAF within each QoS STA to avoidinternal collisions between ACs. After frames collide within a QoS STA and the lower priority AC subsequently gains a TXOP, the retrybit in the MAC header must be set to 1 to indicate a retry.

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which statement is correct about RSTP port roles?

Its NAV must be equal to one. The STA must receive a BlockAck, resetting the NAV to zero. The appropriate interframe space must expire. The backoff timer for the AC must equal zero. Its CCA must report that the medium is idle.

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

How are STP timers and state transitions affected when a topology change occurs in an STP environment?

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. Access points send Beacon frames on all HT channels in the 2.4 GHz ISM band in a consecutivemanner including the channel for which the access point is configured. Client stations send Probe Request frames on all HT channels in the 2.4 GHz ISM band in aconsecutive manner until they associate with an access point. After associating to an access point, they no longer transmit Probe Request frames. Access points send Beacon frames only on the HT channel in the 2.4 GHz ISM band for which theaccess point is configured, and only after scanning that channel to discover existing BSSs. Client stations send Probe Request frames on all HT channels in the 2.4 GHz ISM band in aconsecutive manner until they receive at least 3 Probe Response frames.

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What is the result of entering the command spanning-tree loopguard default?

Following non-QoS Data frames with the More Fragments bit set to 1, the Duration/ID field of the ACK frame is set to a value equal to two SIFS plus the next Data fragment and its ACK. The RA field of ACK frames is always obtained from the Address 2 field in the corresponding framebeing acknowledged. Probe request acknowledgement (sending of a Probe Response frame) is configurable in the accesspoint and is always linked to SSID broadcast configuration in Beacons. In an EDCA BSS, encrypted Data frames are only acknowledged by client stations, never by accesspoints. Data frame fragments are acknowledged individually (with an ACK frame).

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Examine the diagram. A network administrator has recently installed the above switched network using 3550s and would like to control the selection of the root bridge. Which switch should the administrator configure as the root bridge and which configuration command must the administrator enter to accomplish this?

BlockAckSetupReq ✘ BlockAckReq ✘ ADDBA Request ✘ BlockAckPolicyReq ✔ ActionBAReq ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

What must be the same to make multiple switches part of the same Multiple Spanning Tree (MST)?

All frames within that block must be retransmitted by the originator. ✘ The last frame within that block must be retransmitted by the originator. ✘ The BlockAckReq must be retransmitted by the originator. ✘ Nothing. No ACK is expected in response to a Basic BlockAckReq. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which statement correctly describes the Cisco implementation of RSTP?

In an RSN, HT stations may not communicate with one another using TKIP. ✘ TKIP cannot be supported in an HT BSS. ✘ All unicast traffic transmitted by an HT station and destined to an HT station must use AES- CCMP. ✘ HT BSSs are prevented from supporting WEP. ✔ HT BSSs must mandatorily support 802.11r FT. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

The network administrator maps VLAN 10 through 20 to MST instance 2. How will this information be propagated to all appropriate switches?

RSN IE (Robust Security Network) FSR IE (Fast Secure Roaming) HT IE (High Throughput) MD IE (Mobility Domain) FT IE (Fast Transition)

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

Which MST configuration statement is correct?

DA = MAC of default gateway; RA = BSSID of the AP to which the STA is associated ✘ DA = BSSID of targeted AP; RA = BSSID of the AP to which the STA is associated ✘ DA = MAC of the default gateway; RA = Ethernet MAC of the targeted AP ✘ DA = BSSID of the targeted AP; RA = Ethernet MAC of the targeted AP ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

10.

While logged into a Company switch you issue the following command:
CompanySwitch(config-mst)#instance 10 vlan 11-12
What does this command accomplish?

Following a period of time in a low power state, client stations wake themselves and automatically poll
the access point for traffic using a PS-Poll frame. ✘ When the access point's buffer is full, the access point wakes all client stations using a PS-Poll frameso that they can receive the data. ✘ Upon receiving traffic for a dozing station, the access point wakes the client station using a PS- Pollframe so that the client station can receive the data. ✘ After waking from a low power state, client stations listen for the next Beacon to determine if sending aPS-Poll frame to the access point is necessary. ✔ After waking at a scheduled TBTT, client stations send Null Function frames to the access point with thePower Management bit set back to zero. ✔

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Answer & Solution

Answer: Option B

Solution:

It provides fallback for IE8.

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