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Which spread spectrum technology does the 802.11b standard d

题目
单选题
Which spread spectrum technology does the 802.11b standard define for operation（）。
A

IR

B

DSSS

C

FHSS

D

DSSS and FHSS

E

IR, FHSS, and DSSS

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相似问题和答案

第1题：

Spread spectrum simply means that data is sent in small pieces Over a number of the(46)frequencies available for use at any time in the specified range. Devices using(47)spread spectrum (DSSS)communicate by(48)each byte of data into several parts and sending them concurrently on different(49). DSSS uses a lot of the available(50), about 22 megahertz (MHz).

A．continuous

B．high

C．low

D．discrete


正确答案：D

第2题：

Like no previous technology, mobile technology has spread______an unprecedented pace in the last few years.

A.at
B.in
C.on
D.with

答案：A
解析：
本题考查介词用法辨析。题目意为“与之前的技术不同，移动技术在过去几年中以前所未有的速度发展。”根据题干，at a pace为固定搭配，意为“以……的速度”，因此A选项正确。
　　

第3题：

In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet.

Spread spectrum simply means that data is sent in(66)pieces over a number of the discrete frequencies available for use at any time in the specified range. Devices using(67) spread spectrum (DSSS)communicate by splitting each(68)of data into several parts and sending them concurrently on different (69), DSSS uses a lot of the available(70), about 22 megahertz (MHz).

A．small

B．high

C．low

D．long


正确答案：A

第4题：

Spread Spectrum扩展频谱


正确答案: 用于避免干扰和达到较高吞吐率的传送技术。替代单一的载波频率，发送方和接收方协调使用一组频率，既可同时也可从一者改变到另一者。该技术对无线网特别重要。

第5题：

n a virtual port channel （vPC） configuration， VRRP exhibits which characteristic？ （）

  • A、 VRRP does not work with vPC due to industry standard requirements
  • B、 VRRP works with vPC in traditional active/standby modes
  • C、 VRRP works with vPC in an active/active mode
  • D、 VRRP work with vPC as long as vPC peer-gateway is configured to address non-standard replies to the physical MAC address

正确答案:C

第6题：

Which spread spectrum technology does the 802.11b standard define for operation()。

A.IR

B.DSSS

C.FHSS

D.DSSS and FHSS

E.IR, FHSS, and DSSS


参考答案：B

第7题：

Which three solutions does AirMagnet VoFi Pro Analyzer integrate?（）

  • A、Cisco Unified Communications Manager
  • B、Cisco Spectrum Expert
  • C、Vocera Server to display the username of the Vocera badge
  • D、Polycom SpectraLink syslog server
  • E、Cisco WCS VoWLAN readiness tool

正确答案:A,C,D

第8题：

Which POWER6 virtualization technology is the minimum to enable multiple shared processor pool functionality?()

A.PowerHA Standard Edition

B.PowerVM Standard Edition

C.Power6 Management Edition

D.Power6 Virtualization Edition


参考答案：B

第9题：

扩频（spread-spectrum）技术是使用ISM频带传输无线数据的基础。


正确答案:正确

第10题：

Which spread spectrum technology does the 802.11b standard define foroperation？（）

  • A、IR
  • B、DSSS
  • C、FHSS
  • D、DSSS and FHSS
  • E、IR，FHSS，and DSSS

正确答案:B

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