PW0-270 試験問題を無料オンラインアクセス

What two IEEE 802.11 entities may be used to separate successful transmissions within an EDCA TXOP? (Choose 2)

• A.ACK
• B.PIFS
• C.RIFS
• D.SIFS
• E.EIFS
• F.CAP
• G.AIFS

As it pertains to HT L-SIG TXOP Protection, what statement is true?

• A.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.
• B.L-SIG TXOP Protection is specified for the purpose of protecting OFDM (802.11a/g) and HTOFDM (802.11n) transmissions from HR/DSSS stations.
• C.An L-SIG TXOP protected frame exchange sequence always begins with an RTS/CTS or a CTS-to-Self.
• D.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.

Your wireless network troubleshooting kit includes an antenna with the following specifications:
Gain: 5 dBi
Azimuth Beamwidth: 55 degrees
Elevation Beamwidth: 50 degrees
Frequency Range: 2.4 - 2.5 GHz and 4.9 - 5.9 GHz
Polarization: Linear
Impedance: 50 Ohms
For what aspect of network troubleshooting would this antenna be most useful?

• A.Identifying problems with Fresnel zone clearance in long range (10+ miles / 16+ km) point-topoint links
• B.Finding the physical location of an interfering transmitter to identify and remove the source
• C.Increasing resolution bandwidth (RBW) on a spectrum analyzer to improve signature identification features
• D.Matching transmit and receive capabilities for most client stations to reproduce client reception issues
• E.Capturing BSS-wide CRC error and retry statistics in most indoor WLAN environments

According to the 802.11n-2009 amendment, what security requirement is specified for HT BSSs?

• A.In an RSN, HT stations may not communicate with one another using TKIP.
• B.HT BSSs must mandatorily support 802.11r FT.
• C.All unicast traffic transmitted by an HT station and destined to an HT station must use AESCCMP.
• D.HT BSSs are prevented from supporting WEP.
• E.TKIP cannot be supported in an HT BSS.

While at a government-operated facility, you are attempting to troubleshoot a WLAN performance problem using a wireless protocol analyzer. When you start capturing frames, you see a proprietary layer 2 protocol running over the ERP network as shown in this screenshot. The facility's WLAN administrator confirms that this protocol is proprietary and used for both data encryption and compression.

How will this information affect the steps you take to troubleshoot performance problems on this WLAN?

• A.Troubleshooting will be somewhat limited because only part of the information needed for performance measurements by the analyzer is encrypted. Each Data frame's MAC header will be encrypted, but the PLCP header can still be decoded successfully.
• B.In order to troubleshoot performance problems on a network using proprietary encryption protocols like this one, you must use a wireless protocol analyzer that has integrated support for the protocol in use.
• C.The proprietary encryption protocol will have no effect on your troubleshooting steps because the wireless protocol analyzer can still decode the PLCP and MAC headers of Data frames. This situation is essentially no different than troubleshooting a WLAN that uses WPA2-Personal.
• D.As long as you load the proprietary software codec onto your analyzer computer, you will be able to see all of the Data frame information fully decoded. Loading the proprietary software codec will allow you to troubleshoot the WLAN as though no encryption were in use.