최신CWAP Certified Wireless Analysis Professional - PW0-270무료샘플문제

A. 2.4 GHz ISM band interference from sources such as wireless video cameras and analog phones

B. High multipath conditions due to an RF environment with highly reflective materials

C. Two access points with overlapping coverage on a single channel

D. Dynamic Rate Switching algorithms that decrease data rates for latency-sensitive applications

E. Co-located DCF and EDCA access points that are using non-overlapping 2.4 GHz channels

F. High collision rates due to dense population of voice stations and no admission control

A. MAC Service Data Unit field

B. QoS Control field

C. Sequence Control field

D. Data Control field

E. Frame Control field

F. Protocol Order field

A. The DCF Interframe space (DIFS) is nominally 50 (us), but typically varies by as much as 10 (us), which causes delays in Beacons.

B. This trace shows an HT network where HR/DSSS nodes are active on the network. The access point is changing slot times from short to long as needed.

C. The access point must arbitrate to gain access to the RF medium in order to transmit a Beacon.

D. Beacon frames vary in size, and therefore some take slightly longer to send than others.

A. QoS Action

B. Reassociation

C. CTS

D. PS-Poll

E. QoS Null

F. QoS Data

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 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.

C. 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.

D. 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.

A. Use of RTS/CTS requires more overhead than CTS-to-Self due to a higher number of frames transmitted onto the wireless medium.

B. Aside from the Subtype subfield of the Frame Control field, the generic MAC header format of RTS and CTS frames are identical.

C. RTS and CTS frames use Short Interframe Spaces (SIFS), and CTS-to-Self frames use PCF Interframe Spaces (PIFS).

D. 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.

E. RTS and CTS frames are relayed through the access point, whereas the CTS-to-Self frames are not.

F. A CTS-to-Self frame sent by a client station may reach fewer nodes than the RTS/CTS frame exchange.