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Which of the following operates in the 2.4GHz range and has

题目
单选题
Which of the following operates in the 2.4GHz range and has a MAXIMUM distance of 10 meters (33 feet)?（）
A

x-10

B

Bluetooth

C

802.11a

D

802.11b

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相似问题和答案

第1题：

Which of the following operates in the 2.4GHz range and has a MAXIMUM distance of 10 meters (33 feet)?()

A.x-10

B.Bluetooth

C.802.11a

D.802.11b


参考答案：B

第2题：

Which of the following wireless standards can be used to avoid the 2.4GHz range?() (Select TWO).

A.802.11g

B.802.1X

C.802.11b

D.802.1n

E.802.11a


参考答案：D, E

第3题：

When you compare the differences between half-duplex and full-duplex Ethernet, which of the following characteristics are exclusive to half-duplex? (Select two answer choices)

A．Half-duplex Ethernet operates in a shared collision domain.

B．Half-duplex Ethernet operates in an exclusive broadcast domain.

C．Half-duplex Ethernet has efficient throughput.

D．Half-duplex Ethernet has lower effective throughput.

E．Half-duplex Ethernet operates in an exclusive collision domain.


正确答案：AD
解析：Explanation:
A single device could not be sending a frame. and receiving a frame. at the same time because it would mean that a collision was occurring. So, devices simply chose not to send a frame. while receiving a frame. That logic is called half-duplex logic.

Ethernet switches allow multiple frames to be sent over different ports at the same time. Additionally, if only one device is connected to a switch port, there is never a possibility that a collision could occur. So, LAN switches with only one device cabled to each port of the switch allow the use of full-duplex operation. Full duplex means that an Ethernet card can send and receive concurrently.

Incorrect Answers:
B. Full duplex effectively doubles the throughput of half-duplex operation, because data can be both sent and received at the full 10/100 speed.

C, E. In half duplex operation, the network is shared between all devices in the collision domain.

第4题：

Which of the following network devices operates on Layer 1 of the OSI model？（）

  • A、Hub
  • B、Switch
  • C、Router
  • D、Bridge

正确答案:A

第5题：

Which of the following is (are)an advantage of a dry chemical extinguisher over a carbon dioxide extinguisher？The dry chemical extinguisher：Ⅰ．Has a greater range．Ⅱ．Provides a heat shield for the operator．

A.Ⅰonly

B.Ⅱonly

C.Both Ⅰand Ⅱ

D.Neither Ⅰ nor Ⅱ


正确答案：C

第6题：

Which of the following is the full range of address block 192.16876.0／23?()

A.192.168.76.0-192.168.77.255

B.192.168.76.0-192.168.76.255

C.192.168.76.0-192.168.76.23

D.192.168.76.0-192.168.780


参考答案：A

第7题：

According to the text, which of the following statements is TRUE? （ ）

[A] Wal-Mart was forced to withdraw its investment from Germany.

[B] Wal-Mart operates very well in South Korea.

[C] Wal-Mart has wholly-owned operations in China and Canada.

[D] Wal-Mart made its new company logo known in 2009.


正确答案：A

第8题：

Which of the following wireless technologies can support the GREATEST distance on either 2.4GHz or 5GHz frequencies?()

A.802.11a

B.802.11b

C.802.11g

D.802.11n


参考答案：D

第9题：

A user reports that when the phone rings in their house the wireless on their laptops becomes disconnected. Which of the following BEST describes the issue?（）

  • A、The cordless phones are plugged into same outlet as the router
  • B、The cordless phones are 5.8Ghz which interferes with wireless
  • C、The cordless phones are 2.4Ghz which interferes with wireless
  • D、The cordless phones are plugged into the RJ-11 jack

正确答案:C

第10题：

All users within an office are wirelessly connected to a network, except one user that has a valid connection on a leased IP address in a different range. Which of the following is a possible cause of the user having a different IP address range?（）

  • A、The wireless access point is using MAC address filtering
  • B、The user has connected to a nearby wireless access point from another office
  • C、The user has configured the wireless settings with the wrong encryption type
  • D、The wireless access point has SSID broadcast disabled

正确答案:B

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