超星 - Unit 11 Text A: How WiFi Works

单选题

What is the purpose of using wireless network ( ).

A. Connect mobile device
B. Need for urban development
C. Need for political
D. Need by residents

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单选题

Which one is not the advantage of Wi-Fi ( ).

A. Low cost
B. Easy to set up
C. Unobtrusive
D. Speed limitless

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单选题

What is the notable difference between Wi-Fi radio and other radios? ( ).

A. They transmit at frequencies of 2.4 GHz or 5 GHz.
B. They use 802.11 networking standards.
C. The spectrum that Wi-Fi used is not the same with other radio.
D. Wi-Fi radios can transmit on any of two frequency bands.

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单选题

Which one is one of the 802.11 networking standard? ( ) .

A. 802.11q
B. 802.11g
C. 802.11k
D. 802.11z

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单选题

What is the characteristic of 802.11a ( ).

A. Transmits at 2.4 GHz
B. Transmits at 5 GHz
C. Is the slowest and least expensive standard
D. Is the most widely available of the standards

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单选题

What is the characteristic of 802.11b ( ).

A. Is backward compatible with predecessors
B. Transmits at 5 GHz
C. Is the slowest and least expensive standard
D. Is the most widely available of the standards

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单选题

What is the characteristic of 802.11g? ( ).

A. Uses Orthogonal Frequency-Division Multiplexing coding technique
B. Transmits at 5 GHz
Can achieve speeds as high as 140 megabits per second
D. Can transmit up to four streams of data

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单选题

Which one could be recognized as Wi-Fi hotspot in definition. ( )

A. Wireless network in home with personal username and password
B. Wire network which connect by CAT-6 cable.
Cellular network
D. Wireless network in public area

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单选题

Which one is the element which is included in the unit of a wireless network ( ).

A. Router
B. Firewall
C. Browser
D. A port to connect to cable or DSL modem

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单选题

Which one is not the method that could be used for keeping network private? ( )

A. WPA2
B. WEP
C. MAC address filtering
D. VHT

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