四川大学期末SSD2考试试题C卷四川大学期末考试试题（闭卷）（2008-2009学年第1学期）课程号：311016040 课序号：课程名称：计算机系统导论（C 卷）任课教师：张磊尹皓吴琼适用专业年级：软件工程2008级学生人数：印题份数：学号：姓名：考试须知四川大学学生参加由学校组织或由学校承办的各级各类考试，必须严格执行《四川大学考试工作管理办法》和《四川大学考场规则》。
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题号一二三四五六七八九十得分阅卷教师阅卷时间总成绩期末卷面% 期中卷面% 实验成绩% 考勤成绩% 一、单项选择题（本大题共40小题，每小题1分，共40分）在每小题列出的四个备选项中只有一个是符合题目要求的，请将其代码填写在题后的括号内。
错选、多选或未选均无分单项选择题。
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 401. Of the following, which best describes the difference between bits and bytes?(a) A bit is the smallest unit of information in a computer. A byte is a collection of bits.(b) A byte is the smallest unit of information in a computer.A bit is a collection of bytes.(c) There is no difference between bits and bytes. The terms are used interchangeably.(d) A byte represents the values 0 and 1, while a bit represents a range of values from 0 to 255.2. What is the binary equivalent of the decimal number 123?(a) 1111111 (b) 1111011 (c) 1101110 (d) 11111013. A(n) _____ technician participates in the construction of computer chips, circuit boards, system units, or peripheral devices.(a) manufacturing (b) database (c) software engineering (d) system4. Which of the following kinds of projects typically requiresa special type of CPU that would not be found in a desktop or mainframe computer?(a)Monitoring the operation of an automobile engine(b)Performing business calculations for a financial report(c)Looking up and storing information on customer accounts(d)Processing requests to send and receive email5. Computer output devices include which of the following?I. Projector II. Microphone III. Printer(a) I, II, and III (b) II and III only (c) I and II only (d) I and III only6. Of the following types of storage, which provides the fastest access to data?(a) RAM (b) CD-ROM (c) hard disk (d) cache7. The speed of a computer bus is measured in _____, whereas the transfer rate is measured in _____.(a) bits, channels (b) channels, bits (c) hertz, Bps (d) Bps, hertz8. Why is it important to have large amounts of RAM in a computer system?(a)Programs cannot access files unless the entire file is first loaded into RAM.(b)RAM continues to be less expensive than hard disk memory.(c)You cannot load and execute a program unless there is sufficient RAM to hold all of a program's CPU instructions.(d)Multitasking and large programs run slowly if there is insufficient RAM.9. Which of the following is a reason for degradation in computer system performance due to insufficient RAM?(a)It takes a longer time to transfer data from the hard disk to the cache.(b)It takes a longer time to transfer data from the peripheral devices to the chipset.(c)Instructions have to be loaded frequently from the hard disk.(d)The processor performance will be less than optimal.10. Which of the following statements is (are) true?I. CD-ROM drives use laser technology.II. CD-ROM drives typically cannot be used to write data onto disks.(a) II only (b) None (c) I only (d) I and II11. In a typical computer, when saving data to the hard disk, the chipset sends the data to the disk controller via the(a) AGP bus (b) parallel ports (c) serial ports (d) PCI bus12. In a typical computer, data from storage devices is passed to the chipset through the(a) disk controller (b) PCI expansion slots (c) AGP expansionslots (d) PS-2 ports13. Computers that operate in essentially the same way are said to be(a) Integrated (b) user-friendly (c) compound (d) compatible14. Which of the following software layer sequences correctly represents the task of saving a file with a text editor?(a) application, operating system, device driver, hardware(b) operating system, application, hardware, device driver(c) application, operating system, hardware, device driver(d) operating system, device driver, application, hardware15. Which of the following is an example of an interrupt?(a) The CPU stops the operating system due to an internal error.(b) An application informs the operating system that it has finished executing.(c) A device indicates to the operating system that it has received input.(d) Betty, a user, indicates to the operating system that she wants to stop an application.16. Which of the following is (are) true regarding the cluster size of a disk drive?I. A cluster is the smallest amount of space that a file can occupy in a disk.II. The cluster size will decrease as the size of the disk increases.(a) I and II (b) II only (c) None (d) I only17. Applications that are designed to work together to create complex documents containing different types of data are referred to as(a)groupware (b) consolidated (c) utilities (d) an office suite18. Within Windows, where can a user find applications for changing the operating system configuration?(a) Online help (b) Control panel (c) File manager (d) Resource manager19. File management software adapts to different files because of a concept called data(a) indexing (b) independence (c) input (d) sorting20. Which of the following is (are) true of a database?I. A database can contain a variety of different record formats.II. Each database can have only one record format.III. A database consolidates flat files into a single collection of diverse information.(a) II and III only (b) I and III only (c) I only (d) II only21. Who of the following focuses on the software component of an information system, including software design, programming, and testing?(a) Systems analyst (b) Software engineer (c) Database administrator (d) Systems administrator22. Which of the following is(are) limitations of Object Linking and Encoding (OLE)?I. It is not supported by all applications.II. The application program used to create the embedded data must be installed on the user's computer for editing.III. There may be loss of information when embedding data.(a) I, II, and III (b) I and II only (c) I only (d) II and III only23. Virtual memory involves temporarily moving unneeded instructions or data from RAM to(a) cache memory (b) a computer on the network (c) a hard disk (d) the CPU24. Under Windows, what extension is used for files that contain a sequence of predefined commands to the operating system?(a) .exe (b) .com (c) .txt (d) .bat25. In the software development process, which of the following methods are used to assist programmers in finding "bugs" in their software?I. DebuggingII. TestingIII. Code Reviews(a) I and III only (b) I and II only (c) I, II, and III (d) II and III only26. Device drivers facilitate communication between which layers of the system?(a) The operating system and applications using hardware devices(b) The operating system and hardware devices(c) Applications and hardware devices(d) Different hardware devices27. Which of the following are programs containing software instructions to be executed by the CPU?I. BIOSII. Device driverIII. Operating system(a) I and III only (b) I and II only (c) II and III only (d) I, II, and III28. Networks typically use _____ cable.(a) NIC (b) coaxial (c) twisted pair (d) wireless29. Which of the following components are required for an email system?I. Email server softwareII. Post office softwareIII. Email client software(a) II and III only (b) I, II, and III (c) I and III only (d) I and II only30. Which of the following connections uses shared bandwidth, resulting in reduced speeds when a large number of users are online?(a) Cable modems (b) ISDN (c) T1 (d) Telephone modem31. Which of the following are tasks performed by a Web browser?I. Sending a request for a specific file to a serverII. Formatting and displaying a file received from a serverIII. Sending additional requests to the server to retrieve any graphics elements such as icons or images for a requested file(a) I, II, and III (b) II and III only (c) I and II only (d) I and III only32. Which of the following symbols is used to separate directory paths in a URL?(a) . (b) // (c) / (d) :33. Which encryption method uses a pair of digital keys?(a) S-HTTP(b) Public key encryption(c) SSL(d) Active-X34. Which of the following must be included on a digital certificate?I. The name of the entity and the expiration dateII. The number of times the certificate has been viewedIII. The digital signature of the certificate authority(a) I, and III (b) II and III only (c) I and II only (d) I, II, and III35. A full backup was performed on Monday and incremental backups were performed on each of the next two days. What is the correct search order for finding the most recent version of a backed-up file?(a) The first incremental backup, the last incremental backup, the full backup(b) The full backup, the first incremental backup, the last incremental backup(c) The last incremental backup, the first incremental backup, the full backup(d) The full backup, the last incremental backup, the first incremental backup36. One of the most common applications of encryption is transmitting data securely over the Web via(a) a simple substitution code (b) a Trojan horse (c) e-mail (d) the Secure Socket Layer (SSL)37. A conventional phone line is capable of transmitting which of the following?(a) Voice only (b) Data in analog form (c) Audio data only (d) Optical data38. The FTP protocol(a) is only used on intranet servers(b) allows communication with computers that are not running a Web server(c) ensures encryption of files being transferred(d) is a much newer technology than HTTP39. When connecting to an ISP using a standard phone line, which of the following is (are) required?I. A phone number to access the ISP's Internet servercomputerII. Account name and passwordIII. An internal or external modem(a) I and III only (b) I and II only (c) II and III only (d) I, II, and III40. Which of the following correctly characterizes the part of the email address after the @ (the "at" sign)?(a) The email server name on which the recipient has an account(b) The Web server of the recipient(c) The computer name of the recipient's computer(d) The IP address of the recipient's computer二、问答题（6道题，共60分）1． Component Identification（10分）Choose among the following components to label the image: MotherboardPower supplyBIOS ROM ChipCooling fanExpansion slotRAM chipExpansion cardDisk drivesChipsetIDE cableEthernet cablePCI busLabel A is _____.Label B is _____.Label C is _____.Label D is _____.Label E is _____.Label F is _____.Label G is _____.Describe the functionality of each of the following components (in 2 sentences or less):Microprocessor:RAM:Bus:Expansion card:2. Boot Process （10分）a. What are two functions of the boot process?b. Describe the steps involved in a POST (include the information BIOS displays at the end of POST).c. Fill in the following chart by arranging the steps of the boot process below in order.* Copy BIOS to RAM* Execute BIOS program* Identify peripheral devices* Load device drivers* POST* Search for Master Boot Record and load the operating systemSteps in the Boot Process Power On ? ? ? ? ? ? Operating System Operational3．Cryptography（10分）In this section, you will encode/decode simple messages using different cryptography methods.a. Consider the alphabet shift cipher. Complete the following table:Plaintext Encryption Technique Ciphertext Software Shift right by 4 characters ? ? Shift right by 3 characters Vbvwhpv b. What is the maximum number of ways you can replace a character using the above alphabet shift cipher? What is the size of the key space? What is a weakness of the alphabet shift cipher above?c. How does using a secret passphrase as the encryption key compare to using the alphabet shift cipher? Let us try using a passphrase to encrypt the message "Meet at noon." with a larger key space. The key is "CBA". In this case, only encrypt alphabet letters.d. What is the encrypted message?4. Data Representations in a Computer System（10分）The Extended ASCII chart below shows characters and their binary representations. Use the chart below and a calculator to answer the following questions:Figure 1 ASCII codeYou can obtain the binary representation of a word by concatenating the ASCII values of each letter. For example, “SSD2” in binary representatio n is 01010011 01010011 01000100 00110010.a. “Fun” in binary representation is __ _.b. “Play” in binary representation is __ _, which is equivalent to __ _ in decimal representation.c. 01100011 01100001 01110010 01100101 01100101 01110010 01110011 is the binary representation of the ASCII string__ _.d. 0x7374617274 is a hexadecimal representation of the ASCII string __ _.e. 1751478885 is the decimal representation of the ASCII string __ _.5. Batch File Creation（10分）In this section, you will interface with the operating system using DOS commands.For each of the following tasks, list the correct DOScommand. Note: While it is not necessary to perform these tasks on a computer, the assignment is structured for each task to be completed in sequence; that is to say, a task may depend on the state created by previous tasks.a. Name the batch file EXDIR.BAT.b. Include your name as a remark in EXDIR.BAT.c. Include the creation date as a remark in EXDIR.BAT.d. Include the function of EXDIR.BAT as a remark in EXDIR.BAT- redirects the output of “dir C:\” to a file named by the user.e. The filename provided by the user is the first argument.f. A valid switch for the command dir is the optional second argument.g. If the file named by the user already exists, EXDIR.BAT immediately generates an error message and then exits without executing dir.h. The error message generated by EXDIR.BAT must display, "filename already exists, aborting EXDIR."Write down your batch file code.6. XML and HTML （10分）a. What does the term “XML” stand for? What is the function of XML tags, and how does the function of XML tags differ from the function of HTML tags?b. Contrast the flexibility of using XML tags and HTML tags.c. What is one reason why storing data in XML may be preferred to enable multiple systems to exchange data?d. If there are two files：Movies100EX.xml and display.html on your Desktop. Open display.html using Notepad.exe to see the content of the HTML file. Note that the references used to embed the xml file are highlighted in bold font below:Generate another HTML file that displays additional data fields from the XML file, listing Movie_id, Title, Year, Score, and Votes.课程名称：信息系统任课教师：学号：姓名：本题12页，本页为第2页教务处试题编号：注：试题字迹务必清晰，书写工整。
