全國(guó)計(jì)算機(jī)等級(jí)考試四級(jí)筆試試題(參考版)
2025-03-27 07:36本頁(yè)面
【正文】 (15分)F)。調(diào)用參數(shù)a分別表示發(fā)送消息的內(nèi)存區(qū)首地址 或接收進(jìn)程的內(nèi)存消息區(qū)首地址。 (3) 消息緩沖通信機(jī)制中提供發(fā)送消息原語(yǔ)。 (10分) (1) 試敘述高級(jí)通信機(jī)制與低級(jí)通信機(jī)制P、V原語(yǔ)操作的主要區(qū)別。 消息緩沖通信技術(shù)是一種高級(jí)通信機(jī)制,由Hansen首先提出。系統(tǒng)中各進(jìn)程異步執(zhí)行,但有些進(jìn)程之間必須保持一定的聯(lián)系,以便協(xié)調(diào)一致地完成指定任務(wù)。 (1) 請(qǐng)用Ethernet發(fā)送與接收流程框圖說(shuō)明CSMA/CD介質(zhì)訪問(wèn)控制方法的基本工作原理。今后的網(wǎng)絡(luò)應(yīng)該是傳統(tǒng)Ethernet、 FastEthernet LAN與ATM共存的結(jié)構(gòu)。隨著網(wǎng)絡(luò)應(yīng)用的發(fā)展,以及大型信息系統(tǒng)與多媒體技術(shù)的應(yīng)用,人們對(duì)局域網(wǎng)性能提出了越來(lái)越高的要求,出現(xiàn)了符合 100BASET標(biāo)準(zhǔn)的Fast Ethernet、交換局域網(wǎng)Switching LAN與ATM等高速局域網(wǎng)產(chǎn)品。 二、論述題(兩個(gè)論述題可任選其一,并只選其一,多選無(wú)效,滿(mǎn)分30分。 A) 111101 B) 00011 C) 11010011 D) 1101001 (90) According to the principle of CRC calculation, given a framebit series M =11100111 and the multipleterm formula, framebit series generated by the CRC G =110011, then the CRC is ____.(2分) A) Neither B) Ⅰ only C) Ⅱ only D) Ⅰ and Ⅱ II. All host names must be registered with an Internetwide central registry. A) cell exchange (85) When an amount of memory is requested that is less than the size of a page, but a full page is allocated, the r A) storein B) writeback C) copyback D) writethrough A) Neither II. Portability is guaranteed across all machines that have the same instruction set and operating system. (2分) across the range of machines that support the language. I. Using a highlevel language that conforms to an ISO standardguarantees portability (82) Which of the following is (are) true about software portability? ____. C) system testing D) acceptance testing B) beta testing D) (80) Which of the following statements about testing software with data is (are) true?____. Two other important ponents are specifications of the____. design constraints. functional requirements, and user interface, information flow, p。 (79) Specifications for software should containamp。 C) C) high cohesion with low coupling D) high cohesion with high coupling A) low cohesion with low corpling B) low cohesion with high coupling (78) In the design phase of software engineering, deposition of the program into modules should follow the principles of ____. D) A superclass includes the attributes and methods of all its subclasses. C) A subclass can inherit the attributes and methods of all its superclasses. B) Encapsulation and inheritance are two important features of object oriented databases. A) Each object has a unique object identity in the system. (77) Which of the following statements about object oriented databases is NOT correct? ____. (2分) A) batches B) procedures C) triggers D) transactions to all SQL statements in order to distinguish SQL statements from the host language statements is____. (75) When embedding SQL in a C language program, the prefix that should be added A) Union B) Difference C) Intersection D) Division {tuple│tuple∈R?tuple∈\ S} (73) A) 100KB B) 190KB C) 330KB D) 410KB If there is a request for 40KB of memory and the bestfit algorithm is used, then the beginning address of memory that is allocated in response to the request is ____. (72) Consider the following figure, where the shaded parts represent already assigned blocks of memory, D) A) |Neither B) Ⅰ only C) Ⅱ only D) Ⅰ and Ⅱ Questions 65 66 refer to the space requirements of different methods of storing graphs. The choices for these questions are binations of the following statements. ?、? The space required depends on the number of vertices. ?、? The space required depends on the number of edges. (65) When the adjacency matrix method is used to store a graph, which of the statements is (are) true? ____． A) None B) Ⅰ only C) Ⅱ
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