推 Kunimitsu:趕謝R大說明 ^^ 06/28 15:10
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※ 引述《Kunimitsu (#########)》之銘言：
: Multiple-Choice Questions (10%)
: (1) The digital signature method does not provide _____
: (a) Privacy
: (b) Authentication
: (c) Integrity
: (d) Non-repudiation.
這是說數位簽章吧...
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
雖然ABC都是讓I/O device跟memory傳輸資料，但要直接的話就只有C了
至於那個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(中繼/放大機)應該只負責把變弱的訊號加強
http://en.wikipedia.org/wiki/Network_bridge
http://en.wikipedia.org/wiki/Protocol_bridge
看樣子Bridge就是答案之一
http://en.wikipedia.org/wiki/Router
Router有可能是答案之一...我非常不確定
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."
看樣子Gateway是答案之一，也間接指出Router也是答案之一
所以答案是BCD...應該吧
: (4) Defining the users, needs, requirements, and methods is part of the
: ____phase.
: (a) Analysis
: (b) Design
: (c) Implementation
: (d) Testing.
這好像是考程式設計流程吧...答案應該是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沒錯，向量圖是點跟線的組合...奇怪沒提到點就是了
: (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無損壓縮
B是有損壓縮，解壓後得不到原始資料
CD是惡搞選項= =
: (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...應該
注意這個條目
http://en.wikipedia.org/wiki/OSI_model
"Description of OSI layers"項目右邊的表格顯示
physical layer 的資料單位是bit，data-link layer則是Frame
而且只有physical layer負責medium之間的資料傳遞
所以應該只有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)
之前那個條目繼續用
"Gateways, also called protocol converters, can operate at any layer of the
OSI model."
雖然只要答D就可以了...但複選題ABC不選不知道可不可以= =
: (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
顯示他只負責到layer 2...答案就是B了(也可以把A加進去)
但是
http://en.wikipedia.org/wiki/Protocol_bridge
這個條目跟上一題一起看得結果好像變成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沒錯
順便提一下，UDP也是屬於transport layer
: 我的答案是:
: (1) a
: (2) a,b
: (3) a,b,c,d
: (4) a,b
: (5) a
: 麻煩各位了 <(_ _)>
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※ 編輯: RJking 來自: 122.117.92.133 (06/28 04:44)