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 send

题目

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

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第1题

An IP ( ) is a unique number the computer uses to identify itself, and to be identified over a network.A.addressB.deviceC.pointD.data

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第2题

Which spread spectrum technology does the 802.11b standard define for operation()。A.IRB.DSSSC.FHSSD.DSSS and FHSSE.IR, FHSS, and DSSS

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第3题

The（）approach to language is to see it in terms of the bits and pieces by means of which it is put together.

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第4题

Which statement is true about a worm attack？（）A、Human interaction is required to facilitate the spread.B、The worm executes arbitrary code and installs copies of itself in the memory of the infected computer.C、Extremely large volumes of requests are sent over a network or over the Internet.D、Data or commands are injected into an existing stream of data. That stream is passed between a client and server application.

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第5题

Which value is NOT supported by Cisco Spectrum Expert， when checking for RF coverage？（）A、Access point received-signal strength levelB、Spectrum utilizationC、Client data rateD、In-band radio frequency interference

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第6题

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

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第7题

Which two statements correctly describe the relation between a data file and the logical databasestructures（）A、An extent cannot spread across data files.B、A segment cannot spread across data files.C、A data file can belong to only one tablespace.D、A data file can have only one segment created in it.E、A data block can spread across multiple data files as it can consist of multiple operating system （OS） blocks.

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Spread spectrum simply means that data is sent in small pieces Over a number of the(46)fre

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