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软考数据库系统工程师上午试卷

发布时间:2006-06-28 02:14     点击:
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  ●以太网100BASE-TX标准规定的传输介质是_(61)_ 。

  (61)A.3类UTP    B.5类UTP   C.单模光纤   D.多模光纤

  ●许多网络通信需要进行组播,以下选项中不采用组播协议的应用是 _(62)_。在IPv4中把_(63)_类地址作为组播地址。

  (62)A.VOD      B.Netmeeting C.CSCW     D.FTP

  (63)A.A       B.B      C.D       D.E

  ●将双绞线制作成交叉线(一端按EIA/TIA 568A线序,另一端按EIA/TIA 568B线序),该双绞线连接的两个设备可为_(64)_。

  (64)A.网卡与网卡         B.网卡与交换机

    C.网卡与集线器        D.交换机的以太口与下一级交换机的UPLINK口

  ●以下不属于中间件技术的是 _(65)_ 。

  (65)A.javaRMI    B.CORBA   C.DCOM      D.JavaApplet

  ●Networks can be interconnected by different devices in the physical layer networks can be connected by _(66)_ or hubs .which just move the bits from one network to an identical network. One layer up we find bridges and switches which operate at data link layer. They can accept _(67)_ examine the MAC address and forward the frames to a different network while doing minor protocol translation in the process in me network layer ,we have routers that can connect two networks, If two networks have _(68)_ network layer, the router may be able to translate between the packer formats. In the transport layer we find transport gateway, which can interface between two transport connections Finally, in the application layer, application gateways translate message _(69)_ .As an example, gateways between Internet e-mail and X.400 e-mail must _(70)_ the e-mail message and change various header fields.

  (66)A.reapers   B.relays    C.packages   D.modems

  (67)A.frimes              B.packets  C.packages   D.cells
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