(63) A．跳線
B．調制解調器
C．跳接器
D．光纜
(64) A．商標
B．形狀
C．長度
D．標號
●下列拓撲結構中，全屬于廣播式網絡的拓撲結構的是 (65) 。
①星型②網狀型③環型④總線型
⑤衛星通信型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 Email is by far the most common Internet activity.You can (71) with anyone in the world who has an Internet address or Email (72) with a system connection to the Internet.All you need is (73) the Internet and an Email program.Two of the most widely used Email programs are Microsoft's (74) and Netscape's Navigator.A typical Email message has three basic (75) : header, message, and signature.
(71) A．connect
B．exchange
C．communicate
D．game
(72) A．account
B．No.
C．user
D．administrator
(73) A．attach with
B．grasp
C．possess
D．access to
(74) A．Yahoo
B．Explorer
C．Foxmail
D．Outlook Express
(75) A．packets
B．elements
C．frames
D．cells
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