●The presentation layer is concerned with the (71) and semantics of the informat
●The presentation layer is concerned with the (71) and semantics of the informationexchanged between two systems． The processes in two systems are usually exchanginginformation in the form. of character (72),numbers, and so on． The information should be changed to bit (73) before ．being transmitted． Because different computers use different encoding systems, the presentation layer is responsible for (74) between these different encoding methods． The presentation layer at the sender changes the information from its sender-dependent format into a common format． The presentation layer at the receiving machine changes the common format into its (75) dependent format．
(71)A．frequency B．syntax C．dialog D．format
(72)A．numbers B．functions C．strings D． codes
(73)A．systems B．characters C．layers D． streams
(74)A．capability B．interoperability C．reliability D．dependability
(75)A．receiver B．user C．server D． customer
正確答案：B,C,D,B,A參考譯文表示層關系到兩個系統之間交換的信息的語法和語義。兩個系統中的進程通常以字符串、數字等形式交換信息。信息在傳輸前首先必須被變換成比特流。由于不同的計算機使用了不同的編碼系統，所以表示層的任務就是保持這些不同編碼方法之間的互操作性。發送方表示層把信息從發送方相關的格式變換為一種通用格式。接收機中的表示層則把通用格式變換為接收方相關的格式。參考答案(71)B(72)C(73)D(74)B(75)A
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