For each blank, choose the best answer from the four choices and write down on the answer sheet. In 66 the strength of the carrier signal is varied to represent binary 1 or 0. 67 is a system that can map a name to an address and conversely an address to an name. 68 is a three -way handshaking authentication protocol that it's packets are encapsulated in the point - to -point protocol. 69 is an approach that enables an ATM Switch to behave like a LAN switch. 70 is an guided media which is made of glass or plastic and transmits signals in the form of light.
66.
A.FDM
B.DSK
C.FCK
D.ASK
A B C D
A
[解析] 此处ASK的意思与题目中的表述一致。
67.
A.AAT
B.NCP
C.DNS
D.DDN
A B C D
D
[解析] 在此DDN表示数字数据服务,符合题目描述。
68.
A.PPP
B.PAP
C.CHAP
D.LCAP
A B C D
C
[解析] 与上题的解题思路相似,利用定义理解。
69.
A.VLAN
B.LANE
C.VPN
D.IPOA
A B C D
B
[解析] 解释同上,此处只有B选项意思最符合题意。
70.
A.Optical fiber
B.Coaxial cable
C.Shielded Twisted-pair Cable
D.Unshielded Twisted-pair Cable
A B C D
B
[解析] 这里解释光纤的概念,所以只能选B。
In the following essay, each blank has four choices. Choose the best answer and write down on the answer sheet. A Web browser is simply a terminal emulator, designed to display text on a screen. The two essential differences between an ordinary terminal emulator and a Web browser are that the browser knows how to deal with 71 , and that it has a mechanism for 72 graphical files. Display text, display graphics, and 73 hyperlinks ——there's 99 percent of the 74 value. That's not to say that the manufacturers didn't go all - out to attach a hyperactive efflorescence of useless capabilities onto their browsers. Remember when media channels in the browser were a big deal, instead of the clutter you can't wait to delete from your favorites of bookmarks menu? Remember when client -side Java applets were supposed to become the preferred 75 , for application development? Remember frames and all their nasty side effects?