2010年软件水平考试网络工程师冲刺试题及答案（9）

2010年软件水平考试网络工程师冲刺试题及答案（9）

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　　1. In the following essay，each blank has fourchoices.Choose the best answer and write down on thean，swer sheet. #

　　Microwave communication uses(1)frequency radio waves that travel instraighdine sthroughthe air.Because the waves cannot(2)with the curvature of the earth，they can be (3)onlyover short distance.Thus，microwave is a good(4)for sending data between bulldingsin a city or on a large college campus.For longer distances，the waves must berelayed by means of“dishes”or (5).These can be installed on towers，highbuildings，and mountain tops. #

　　(1)A.high

　　B.10w #

　　C.1ong

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　　D.short

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　　(2)A.reflex #

　　B.distort

　　C.bend

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　　D.absorb #

　　(3)A.transmitted #

　　B.transformed #

　　C.converted

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　　D.delivered

　　(4)A.material

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　　B.equipment #

　　C.medium #

　　D.channel #

　　(5)A.repeaters #

　　B.radars #

　　C.telephones

　　D.antennas#p#副标题#e# #

　　2. (1)In the strength of the carrier signal is varied to represent binary1 or 0. #

　　(2)is a system that can map a name to an address and conversely an addressto an name.

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　　(3)is a three-way handshaking authentication protocol that it's packets areencapsulated inthe point-to-point protocol #

　　(4)is an approach that enables an ATM Switch to behave like a LAN switch. #

　　(5)is an guided media which is made of glass or plastic and trans mitssignals in the form of light. #

　　(1)A.ASK #

　　B.PSK

　　C.FSK

　　D.FDM

　　(2)A.NAT

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　　B.NCP #

　　C.DDN

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　　D.DNS

　　(3)A.PPP #

　　B.PAP

　　C.CHAP #

　　D.LCP

　　(4)A.VLAN

　　B.LANE #

　　C.VPN #

　　D.IPOA

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　　(5)A.Coaxial cable #

　　B.Optical fiber

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　　C.Unshielded Twisted-pair Cable

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　　D.Shielded Twisted-pair Cable
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