PW0-270 試験問題を無料オンラインアクセス

Why is a high CRC error rate in L2 protocol analysis software NOT always a valid indicator of network performance? (Choose 3)

• A.Layer 2 protocol analysis can only collect and interpret data that is received properly at the MAC layer, and cannot quantify some PHY-layer problems.
• B.If the protocol analysis radio hardware is not located in the same area as intended client devices or APs, its data sampling may not be representative of actual traffic on the network.
• C.If protocol analysis software is not properly configured with frame decryption parameters, it can't accurately calculate a CRC, which includes the encrypted frame body contents.
• D.Radio and antenna hardware used for protocol analysis may not match the receive sensitivity, diversity, MIMO, or antenna gain capabilities of the network WLAN hardware.

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

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

When a client station operating under EDCA sends an RTS frame and NAV protection is desired for only the first or sole frame in the TXOP, the duration field will contain an amount of time, measured in microseconds, equal to which of the following?

• A.1 CTS, 1 ACK, 1 DATA, 3 SIFS
• B.1 RTS, 1 CTS, 2 ACK , 1 DATA, 4 SIFS
• C.The entire duration of the TXOP
• D.1 CTS, 2 ACK, 1 DATA, 2 SIFS
• E.1 RTS, 2 ACK, 1 DATA, 4 SIFS
• F.1 RTS, 1 ACK, 1 DATA, 2 SIFS, 1 DIFS

How long, in microseconds, is the required Slot Time that is announced by an AP in an HT BSS when HR/DSSS, ERP-OFDM, and HT-OFDM client stations are associated to the AP?

• A.10 (us)
• B.20 (us)
• C.2 (us)
• D.9 (us)
• E.4 (us)

Given: Shown are frames captured from an IEEE 802.1X/LEAP authentication. This WLAN is a Robust Security Network (RSN) using the CCMP cipher suite.

Using the information given in the screenshot, calculate how long it takes for only the frames that are part of the 4-Way handshake to complete.

• A.3.018 ms
• B.237.753 ms
• C.243.743 ms
• D.210.443 ms
• E.5.820 ms