單項選擇題Which antenna generally has the narrowest first Fresnel zone in both the horizontal and verticalplanes?()

A.omnidirectional
B.patch
C.Yagi
D.sector
E.parabolic dish


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1.多項選擇題Which two methods can be used to prevent or reduce RFI from colocated directional antennas()

A.Alternate polarization between colocated antennas
B.Cross-polarize antennas between endpoints
C.Install an RF-shielded box around the antennas
D.Increase the distance between the antennas

5.多項選擇題Which three device types are identified by Cisco Spectrum Expert Wi-Fi finding an Avg PulseDuration parameter?()

A.Bluetooth
B.frequency hopping
C.microwave oven
D.802.11b client card
E.802.11b access point

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