2017計算機等級考試四級筆試必備題

　　計算機等級證書(shū)是我們找工作的敲門(mén)磚，現在越來(lái)越多人重視計算機等級考試。以下是百分網(wǎng)小編整理的2017計算機等級考試四級筆試必備題，歡迎學(xué)習!

　　(1) 網(wǎng)絡(luò )中的計算機之間要做到有條不紊地交換數據就必須遵守網(wǎng)絡(luò )協(xié)議，一個(gè)網(wǎng)絡(luò )協(xié)議主要包括三個(gè)要素，即____。

　　A) 語(yǔ)法、原語(yǔ)與數據 B) 語(yǔ)義、數據與軟件

　　C) 層次、接口與原語(yǔ) D) 語(yǔ)法、語(yǔ)義與時(shí)序

　　(2) 當PCM用于數字化語(yǔ)音系統時(shí)，它將聲音分為128個(gè)量化級，每個(gè)量化級采用7位二進(jìn)制碼表示。由 于采樣速率為8000樣本/秒，因此，數據傳輸速率應該達到____。

　　A) 2880bps B) 56Kbps C) 144Kbps D) 1200bps

　　(3) 具有分時(shí)系統文件管理的全部功能，提供網(wǎng)絡(luò )用戶(hù)訪(fǎng)問(wèn)文件、目錄的并發(fā)控制與安全保密功能的局域網(wǎng)服務(wù)器叫做____。

　　A) 電子郵件服務(wù)器 B) WWW服務(wù)器

　　C) 文件服務(wù)器 D) FTP服務(wù)器

　　(4) 在網(wǎng)絡(luò )層實(shí)現多個(gè)局域網(wǎng)互連的設備是____。

　　A) 集線(xiàn)器 B) 網(wǎng)橋 C) 路由器 D) 網(wǎng)關(guān)

　　(5) 在WWW系統中，用戶(hù)可以根據需要自動(dòng)從一臺Web Server搜索到其他任何一臺Web Server，它所采用的是____。

　　A) 超文本(hypertext)技術(shù) B) 超鏈接(hyperlink)技術(shù)

　　C) 超媒體(hypermedia)技術(shù) D) 超文本標注語(yǔ)言HTML

　　(6) Give the logical variables X=Y=1, The value of X V Y(logical addition)

　　is____.

　　A) 1 B) 2 C) 10 D) 0

　　(7) The Programming Counter (PC) is normally used to point out____.

　　A) Programmed execution instruction

　　B) The address of last execution instruction

　　C) The address of current execution instruction

　　D) The address of next execution instruction

　　Items (58) and (59) are based on the following Pascal code.

　　FOR i:=1 TO n -1 do

　　BEGIN

　　k:=i:

　　FOR j:=i+1 TO n DO

　　IF A[j]br> THEN k:=j:

　　IF k<>i

　　THEN BEGIN

　　X:=A[k];

　　A[k]:=A[i];

　　A[i]:=x

　　END

　　END;

　　(8) The sorting method described by the code is called____.

　　A) Insertion sort B) Selection sort C) Radix sort D) Merge sort

　　(9) Suppose elements in array A are already sorted ascending order of their

　　values when the code begins to run, then execution time of the code will be____.

　　A) O(log2n) B) O(n) C) O(nlog2n) D) O(n2)

　　(10) Assume that N=2M and FIFO is used. If the string p1,p2,…,pN is repeated

　　three times, then the number of page faults is____.

　　A) N/2 B) N C) 2N D) 3N

　　(11) Chang, Tian and An are three users of the system. Chang and An are in

　　the same group. Tian is a Super User. Which of the following rights is inconsistent

　　with the given policies?____.

　　A) Tian has W(write) access to An's Mail files

　　B) Tian has E(execute) access to An's Mail files

　　C) Chian has R(read) access to An's text files

　　D) Tian has E(execute) access to Chang's Binary files

　　(12) Software Engineering Economy is an effective part of software engineering,

　　which of the fo llowing content is the research comtent of software engineering

　　economy?____.

　�、�.Estimation of software development cost

　�、�.Earn & Cost analysis of software development

　�、�.Adjustment of software development progress

　　A) Ⅲ only B) Ⅱ and Ⅲ C) Ⅰ and Ⅱ D) all

　　(13) Prototype method is one of the software engineering methods frequently

　　used, which of the following item is the necessary condition for implementing

　　prototype method?____.

　�、�.Can acquire the user requirement quickly

　�、�.Have the tools for building software fast

　�、�.Have a certain accumulation of prototype systems

　　A) Ⅰ only B) Ⅰand Ⅱ C) Ⅱ and Ⅲ D) all

　　(14) ORACLE RDBMS is a distributed DBMS. Which of the following techniques

　　adapted ensure atomicity of distributed transaction?____.

　　A) remote procedure call (RPC) B) Two _phases commit (2PC)

　　C) Snapshots D) triggers

　　(15) In order to get names of schoolboys(SEX='M')whose age=22, from a relation____.

　　S(SNO,SNAME,SEX,AGE),which of the following expressions is (are) correct?

　�、�.πsname(σsex='M'^age=22(S))

　�、�.σsex='M'^age=22(πsname(S))

　　A) Ⅰ only B) Ⅱ only C) Ⅰand Ⅱ D) neither

　　(16) In order to improve the performance of a network server, you need to select

　　bus or local bus. The appropriate local bus is____.

　　A) VESA B) PCI C) EISA D) ISA

　　(17) In terms of M.J.Flynn's taxonomy, the systolic array falls into____.

　　A) SISD B) MIMD C) SIMD D) MISD

　　(18) In the WAN, when a point-to-point subnet is used, an important design

　　issue is the roucer interconnection____.

　　A) topology B) computer C) service D) lines

　　(19) In the Ethernet LAN, an algorithm was chosen to dynarnically adapt to

　　the number of stations trying to send. It is called____.

　　A) backward learning B) binary exponential backoff

　　C) spanning tree D) CRC

　　(20) The typical firewall consists of two packet filters and a (an)____.

　　A) router B) bridge C) application D) server

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