一起答
单选

以下各项中不属于集线器的功能的是(54)。

  • A.集线器提供了一个中央单元,从中可以向网络连接多个节点
  • B.集线器提供多协议服务
  • C.使得可以进行集中式网络管理
  • D.集线器可以放大模拟或数字信号
参考答案
查看试卷详情
相关试题
  1. (76)

    • A.hypertext
    • B.computation
    • C.expectation
    • D.bookmark
  2. (77)

    • A.habits signature
    • B.site
    • C.rages
    • D.address
  3. (75)

    • A.victimized
    • B.personate
    • C.identity
    • D.control
  4. (74)

    • A.connecting
    • B.binding
    • C.looking
    • D.contenttagging
  5. Pharming is a scamming practice in which malicious code is installed on a personal computer or server, misdirecting users to(71)fraudulent Web sites without their knowledge or consent. Pharming has been called "phishing without a lure".

     In phishing, the perpetrator sends out legitimate-(72)looking e-malls, appearing to come from some of the Web's most popular sites, in an effort to obtain personal and financial information from individual recipients. But in pharming, larger numbers of computer users can be(73)victimized because it is not necessary to target individuals one by one and no conscious action is required on the part of the victim. In one form. of pharming attack, code sent in an e-mail modifies local host files on a personal computer. The host files convert URLs into the number strings that the computer uses to access Web sites. A computer with a compromised host file will go to the fake Web site even if a user types in the correct Internet address or clicks on an affected(74)bookmark entry. Some spyware removal programs can correct the corruption, but it frequently recurs unless the user changes browsing.(75)habits.

    • A.few
    • B.fraudulent
    • C.normal
    • D.structured
  6. (72)

    • A.messages
    • B.packets
    • C.information
    • D.reengineering
  7. (71)

    • A.retrieval
    • B.route
    • C.path
    • D.save
  8. (70)

    • A.database
    • B.controller
    • C.lifecycle
    • D.center
  9. (69)

    • A.format
    • B.documents
    • C.text
    • D.network
  10. (67)

    • A.rat
    • B.velocity
    • C.rank
    • D.rates