※ 引述《Kunimitsu (#########)》之铭言： : Multiple-Choice Questions (10%) : (1) The digital signature method does not provide _____ : (a) Privacy : (b) Authentication : (c) Integrity : (d) Non-repudiation. 这是说数位签章吧... http://en.wikipedia.org/wiki/Digital_signature 答案是A : (2) In the ____ method to synchronize the operation of the CPU with the I/O : device, a large block of data can be passed from an I/O device to memory : directly. : (a) Programmed I/O : (b) Interrupt-driven I/O : (c) DMA : (d) Isolated I/O. http://en.wikipedia.org/wiki/Direct_memory_access http://en.wikipedia.org/wiki/Programmed_input/output http://en.wikipedia.org/wiki/Interrupt 虽然ABC都是让I/O device跟memory传输资料，但要直接的话就只有C了 至於那个D是啥... : (3) A ____ is connecting device that acts as a protocol converter. : (a) Repeater : (b) Bridge : (c) Router : (d) Gateway. http://en.wikipedia.org/wiki/Protocol_converter Repeater(中继/放大机)应该只负责把变弱的讯号加强 http://en.wikipedia.org/wiki/Network_bridge http://en.wikipedia.org/wiki/Protocol_bridge 看样子Bridge就是答案之一 http://en.wikipedia.org/wiki/Router Router有可能是答案之一...我非常不确定 http://en.wikipedia.org/wiki/Gateway_(telecommunications) "In a communications network, a network node equipped for interfacing with another network that uses different protocols" "A gateway may contain devices such as protocol translators, impedance matching devices, rate converters, fault isolators, or signal translators as necessary to provide system interoperability." "Routers exemplify special cases of gateways." 看样子Gateway是答案之一，也间接指出Router也是答案之一 所以答案是BCD...应该吧 : (4) Defining the users, needs, requirements, and methods is part of the : ____phase. : (a) Analysis : (b) Design : (c) Implementation : (d) Testing. 这好像是考程式设计流程吧...答案应该是A或B : (5) In the ____ graphic method of representing an image in a computer, the : image is decomposed into a combination of curves and lines. : (a) Bitmap : (b) Vector : (c) Quantized : (d) Binary. 答案是B没错，向量图是点跟线的组合...奇怪没提到点就是了 : (1) In a ____ data compression method, the received data are an exact copy of : the original message. : (a) lossless : (b) lossy : (c) lessloss : (d) glossy 答案：A无损压缩 B是有损压缩，解压後得不到原始资料 CD是恶搞选项= = : (2) The ____ layer of the OSI model transmits a bit stream over a physical : medium. : (a) physical : (b) data-link : (c) network : (d) transport A而已...应该 注意这个条目 http://en.wikipedia.org/wiki/OSI_model "Description of OSI layers"项目右边的表格显示 physical layer 的资料单位是bit，data-link layer则是Frame 而且只有physical layer负责medium之间的资料传递 所以应该只有A : (3) A gateway operates at ____ of the OSI model. : (a) the first layer : (b) the first two layers : (c) the three layers : (d) all layers http://en.wikipedia.org/wiki/Gateway_(telecommunications) 之前那个条目继续用 "Gateways, also called protocol converters, can operate at any layer of the OSI model." 虽然只要答D就可以了...但复选题ABC不选不知道可不可以= = : (4) A bridge operates at ____ of the OSI model. : (a) the first layer : (b) the first two layers : (c) the three layers : (d) all layers http://en.wikipedia.org/wiki/Network_bridge 显示他只负责到layer 2...答案就是B了(也可以把A加进去) 但是 http://en.wikipedia.org/wiki/Protocol_bridge 这个条目跟上一题一起看得结果好像变成D... : (5) The transport layer protocol of TCP/IP is called ____ : (a) TCP : (b) UDP : (c) IP : (d) a and b 答案是A没错 顺便提一下，UDP也是属於transport layer : 我的答案是: : (1) a : (2) a,b : (3) a,b,c,d : (4) a,b : (5) a : 麻烦各位了 <(_ _)> --

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