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(63) A．跳線
    B．調(diào)制解調(diào)器
    C．跳接器
    D．光纜
(64) A．商標
    B．形狀
    C．長度
    D．標號
●下列拓撲結(jié)構(gòu)中，全屬于廣播式網(wǎng)絡的拓撲結(jié)構(gòu)的是  (65)  。
①星型②網(wǎng)狀型③環(huán)型④總線型
⑤衛(wèi)星通信型⑥樹型
(65) A．①②④⑥
    B．①③⑤⑥
    C．③④⑤⑥
    D．②④⑤⑥
●For each blank,choose the best answer from the four choices and write down on the answer sheet.
  (66)  is a one-way function that takes an arbitrarily long piece of plaintext and from itcomputes a fixed-length bit string.
  (67)   is a protocol that most USENET machines now use it to allow news articles to propagate from one machine to another over a reliable connection.
  (68)   is an approach preferred by cable TV providers.In this solution the fiber terminates at an optoelectrical converter and the final  segment is a shared coaxial cable.
  (69)   is a device used to connect two separate network that use different communicationprotocol.
  (70)   is a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
(66) A．MD
    B．RSA
    C．DES
    D．MIB
(67) A．RTP
    B．RTTP
    C．FTP
    D．NNTP
(68) A．ADSL
    B．FTTC
    C．HFC
    D．FTTH
(69) A．Router
    B．Gateway
    C．Bridge
    D．hub
(70) A．NNI
    B．NRZ
    C．NAK
    D．NVT
●In the following essay, each blank has four choices.Choose the best answer and write down on the answer sheet.
Communicating via E�瞞ail is by far the most common Internet activity.You can  (71)  with anyone in the world who has an Internet address or E�瞞ail  (72)  with a system connection to the Internet.All you need is  (73)  the Internet and an E�瞞ail program.Two of the most widely used E�瞞ail programs are Microsoft's  (74)  and Netscape's Navigator.A typical E�瞞ail message has three basic  (75)  : header, message, and signature.
(71) A．connect
    B．exchange
    C．communicate
    D．game
(72) A．a(chǎn)ccount
    B．No.
    C．user
    D．a(chǎn)dministrator
(73) A．a(chǎn)ttach with
    B．grasp
    C．possess
    D．a(chǎn)ccess to
(74) A．Yahoo
    B．Explorer
    C．Foxmail
    D．Outlook Express
(75) A．packets
    B．elements
    C．frames
    D．cells

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