一起答
单选

以下关于VoIP的描述不正确的是(60)。

  • A.VoIP系统一般由IP电话终端、网关(Gateway)、网(关)守(Gatekeeper)、网管系统、计费系统等几部分组成
  • B.在实现方式上,VoIP有电话机到PC、PC到电话机和PC到PC等三种方式
  • C.VoIP的关键技术包括信令技术、编码技术、实时传输技术、服务质量(QoS)保证技术以及网络传输技术等
  • D.VoIP的核心与关键设备是IP电话网关
试题出自试卷《软件水平考试(中级)网络工程师上午(基础知识)试题模拟试卷20》
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