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

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

相似考题

1.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．smallB．highC．lowD．long

2.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．continuousB．highC．lowD．discrete

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

4.Which POWER6 virtualization technology is the minimum to enable multiple shared processor pool functionality?()A.PowerHA Standard EditionB.PowerVM Standard EditionC.Power6 Management EditionD.Power6 Virtualization Edition

更多“Which spread spectrum technology does the 802.11b standard d”相关问题

  • 第1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2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3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4题：

    Which statement describes the call behavior of the Cisco Unified Wireless IP Phone 7921G when it roams from 802.11b to 802.11a?（）

    • A、The phone does a directed call hangup on 802.11b，then does an auto-redial on 802.11a，creating a  new call.
    • B、The phone does a directed call hangup on 802.11b， then the user does a redial on 802.11a，creating a  new call.
    • C、The phone does a disassociation on 802.11b and an association on 802.11a，and call remains up if the  subnet has not changed.
    • D、The phone does not roam from 802.11b to 802.11a when on an active call.
    • E、The phone must switch network profiles to roam from 802.11b to 802.11a.

    正确答案:C

  • 第5题：

    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

    正确答案:A,B,C

  • 第6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

    正确答案:B

  • 第7题：

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

    对

    B

    错


    正确答案： 错
    解析： 暂无解析

  • 第8题：

    多选题
    In which three frequency bands does the Cisco Spectrum Expert Wi-Fi tool perform spectrumanalysis？ （）
    A

    ISM 2.4 GHz

    B

    ISM 900 MHz

    C

    ISM 5 GHz

    D

    public safety 4.9 GHz

    E

    GSM 1.9 GHz


    正确答案： B,E
    解析： 暂无解析

  • 第9题：

    单选题
    Your customer has converted from traditional servers to BladeCenter technology and has a requirement for an RSA adapter on a new BladeCenter server.  Which of the following options would you use？ （）
    A

    Remote Supervisor Adapter II （RSA II Slimline）

    B

    Management Module， which comes standard on the BladeCenter

    C

    Acoustic Attenuation Module

    D

    Ethernet NICs


    正确答案： B
    解析： 暂无解析

  • 第10题：

    单选题
    What does a broad-spectrum interferer lower？（）
    A

    SNR

    B

    noise floor

    C

    level of interference

    D

    Received Signal Strength Indicator


    正确答案： C
    解析： 暂无解析

  • 第11题：

    多选题
    Servers in your environment run Windows Server 2003. You plan to configure a highly available file server. You need to choose the appropriate high-availability technology and the minimum Windows Server 2003 edition for this server.  Which technology and edition should you choose？（）
    A

    failover clustering

    B

    Network Load Balancing

    C

    Windows Server 2003， Standard Edition

    D

    Windows Server 2003， Enterprise Edition


    正确答案： D,B
    解析： 暂无解析

  • 第12题：

    名词解释题
    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。
    解析： 暂无解析

  • 第13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14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15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

  • 第16题：

    In which three frequency bands does the Cisco Spectrum Expert Wi-Fi tool perform spectrumanalysis？ （）

    • A、ISM 2.4 GHz
    • B、ISM 900 MHz
    • C、ISM 5 GHz
    • D、public safety 4.9 GHz
    • E、GSM 1.9 GHz

    正确答案:A,C,D

  • 第17题：

    A System p administrator has just installed a new technology level， but "oslevel -r" does not show the expected technology level.  Which of the following commands would determine which filesets are downlevel（）

    • A、lppchk
    • B、instfix
    • C、oslevel
    • D、installp

    正确答案:B

  • 第18题：

    Which technology does WebLogic Server use to look up a WebLogic JMS resource?（）

    • A、HTTP
    • B、JNI
    • C、JNDI
    • D、T3
    • E、LDAP

    正确答案:C

  • 第19题：

    单选题
    Which of the following does the author mention as a possible disadvantage of telecommuting ?
    A

    Small children cannot understand the boundaries of work and play.

    B

    Computer technology is never advanced enough to accommodate the needs of every situation.

    C

    Electrical malfunctions can destroy a project.

    D

    The worker often does not have all the needed resources at home.


    正确答案： C
    解析：

  • 第20题：

    单选题
    Which technology does WebLogic Server use to look up a WebLogic JMS resource?（）
    A

    HTTP

    B

    JNI

    C

    JNDI

    D

    T3

    E

    LDAP


    正确答案： A
    解析： 暂无解析

  • 第21题：

    单选题
    Cisco Small Business products address which installation requirement more effectively than standard Cisco products?（）
    A

    wireless technology integration

    B

    use of advanced reporting functions

    C

    VPN technology integration

    D

    minimal technical complexity


    正确答案： A
    解析： 暂无解析

  • 第22题：

    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


    正确答案： E
    解析： 暂无解析

  • 第23题：

    单选题
    According to the passage, Asian civilizations, which were ahead of Europe’s, fell behind because ______.
    A

    Asian languages were more difficult to learn

    B

    European languages had simple alphabets

    C

    they didn’t have the technology to spread ideas

    D

    people’s communication skills were not good enough


    正确答案： B
    解析：
    第三段第二句指出“One reason why Asia’s civilizations, in 1000 far ahead of Europe’s, then fell behind was that they lacked the technology to reproduce and diffuse ideas”，由此可知曾经领先于欧洲的亚洲文明落后的原因是他们缺乏传播思想的技术，因此选项C符合文意。reproduce复制；再生。diffuse扩散；传播。

  • 第24题：

    单选题
    Which statement describes the call behavior of the Cisco Unified Wireless IP Phone 7921G when it roams from 802.11b to 802.11a?（）
    A

    The phone does a directed call hangup on 802.11b，then does an auto-redial on 802.11a，creating a  new call.

    B

    The phone does a directed call hangup on 802.11b， then the user does a redial on 802.11a，creating a  new call.

    C

    The phone does a disassociation on 802.11b and an association on 802.11a，and call remains up if the  subnet has not changed.

    D

    The phone does not roam from 802.11b to 802.11a when on an active call.

    E

    The phone must switch network profiles to roam from 802.11b to 802.11a.


    正确答案： D
    解析： 暂无解析

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