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全國計算機等級考試四級筆試試題六(下)
(51) 計算機網絡共享的計算機資源主要指計算機硬件、軟件與_____。A) 物理網絡 B) 路由器 C) 數據 D) 服務器
(52) 分布式計算機系統與計算機網絡不同之處在于:分布式計算機系統存著一個能夠以全局方式自動管理資源的_____。
A) 網絡協議 B) 網絡操作系統 C) 路由器 D) 體系結構
(53) 計算機網絡從組網設備的功能上,可以分為通信子網與_____。
A) 服務器 B) 局域網 C) 數據通信網 D) 資源子網
(54) 網絡拓撲反映出網絡中各實體之間的結構關系,它影響著網絡的性能、系統可靠性與_____。
A) 網絡應用軟件 B) 體系結構 C) 網絡協議 D) 通信費用
(55) 計算機網絡從網絡覆蓋范圍上,可以分為局域網、廣域網與_____。
A) 物理網 B) 城域網 C) 分組交換網 D) 高速網
(56) 在有隨機熱噪聲的通信信道上傳輸數據信號時,信道的最大數據傳輸速率決定于信 道帶寬與_____。
A) 信號強度 B) 噪聲強度
C) 信號噪聲功率比 D) 信號波形
(57) 如果調制解調器的調制速率為4800baud,采用8相調制,那么該調制解調器的數據 傳輸速率為_____。
A) 14400bps B) 2400bps C) 28800bps D) 600bps
(58) 與傳統Ethernet采用相同的介質訪問控制方法與幀結構,而只是將它的每個比特 的發送時間降低到10ns,這種局域網叫做_____。 (2分)
A) ATM B) Fast Ethernet
C) Gigabit Ethernet D) Switched Ethernet
(59) 如果互連的局域網高層分別采用SPX/IPX 協議與TCP/IP 協議,那么我們可以選擇 的互連設備應該是_____。 (2分)
A) 中繼器 B) 透明網橋
C) 自適應網卡 D) 多協議路由器
(60) 局域網交換機增加帶寬的方法是在交換機的多個端口之間建立_____。 (2分)
A) 全連接 B) 并發連接 C) 會話連接 D) 數據連接
(61) The range of an 8bit fixed point integer numbert(no signs) is_____.
A) 0-127 B) 0-128 C) 0-256 D) 0-255
(62) Which set is a proper subset of E? _____.(2 points)
E= {0,1,2,3}
A) {x|x is a real number and x2=9}
B) { x|x is a real number and x+3=0}
C) { x|x is a real number and x2+5x+6=0}
D) { x|x is a real number and x2=-9}
(63) If p and q are statements,which of the following formulas is tautological?_____.
A) ((p→q)∧p)→q B) (q∧(p→q))→p
C) (p∨q)→p∧q D) ┐(p→q)∧q
(64) What is the number of nonisomorphic spanning trees in the following graph? _____.
A) 2 B) 3 C) 4 D) 5
(65) A sequence d=(d1, d.2,….,dn) is graphic if there is a simple nondirected graph with d as its degree sequence.Which of the following sequences is graphic?_____.
A) (2,3,3,4,4,5) B) (2,3,4,4,5)
C) (2,3,3,4,4) D) (1,3,3,3)
(66) Suppose a given binary tree has 10 leaf nodes, then the number of nodes with degree of 2 is_____.
A) 12 B) 11 C) 9 D) Indeterminable
(67) Suppose two dimensional array A[0..8, 0..9] (with element length o f 2 bytes) is stored using row major order, and the base address is 400.Then the address of element A[8, 5] is _____.(2 points)
A) 570 B) 506 C) 410 D) 482
(68) In the following kinds of graphs,which one#39;s adjacency matrix is symmetric?_____. (2 points)
A) Directed graph B) Undirected graph
c) AOV network D) AOE network
(69) To control and manage processes,which of the following data structures should be set up?_____.
A) PCT B) PCB C) PCM D) PCL
(70) In a tree directory of a file system, relative path nam can be used to find files for improving directory retrieval. To do this,which directory of the followings should be set up?_____. (2 points)
A) parent directory B) child directory
C) working directory D) home directory
(71) Which of the following commands is not one for communication among users_____. (2 points)
A) mail B) write C) telnet D) nice
(72) Of the items listed below,which one(s) should be saved into the process control block?_____. (2 Points)
Ⅰ.Process name and process number
Ⅱ.Process running information
Ⅲ.Current opened file information
A) Ⅰ and Ⅱ B) Ⅰ and Ⅲ C) Ⅱ and Ⅲ D) Ⅰ,Ⅱ and Ⅲ
(73) The DOS command which reads and changes properties of a file is_____.
A) ATTRIB B) COMP C) SYS D) XCOPY
(74) In the following statements about functional dependency, which one is incorrect?_____. (2 Points)
A) If X→Y and Y→Z, then X→Z.
B) If X→Y and Y#39;ìY, then X→Y#39;.
C) If X→Y and X#39;ìX, then X#39;→Y.
D) If X#39;ìX, then X→X#39;.
(75) Which of the following is not responsibility of DBA(Data Base Administrator)?
_____. A) Database management system design
B) Database schema definition
C) Database schema modification
D) Integrity constraint specification
(76) Which of the following is not among the basic features of a relational database?
_____. A) It does not matter what order the rows are in.
B) It does not matter what order the columns are in.
C) Different columns should have different column names.
D) Different columns should have different data types.
(77) Which of the following statements about ORACLE is (are) correct?_____.
Ⅰ. ORACLE follows SQL standard
Ⅱ. ORACLE database defines two logical types: table and view
A) Ⅰ only B) Ⅱ only C) Ⅰ and Ⅱ D) none of the above
(78) The task of the general design stage in structured life circle method is, to build what kind of software system structure?_____.
A) program structure B) general structure
C) module structure D) function structure
(79) The software structure is an expression of the relationship among software modules. In the following phrases, which are not the relation among software modules? _____.(2 Points)
Ⅰ. calling relation
Ⅱ. belonging relation
Ⅲ. Execution relation
Ⅳ. process relation
A) Ⅰ and Ⅱ B) Ⅱ and Ⅲ C) Ⅲ and Ⅳ D) none
(80) N-S diagram can used to substitute conventional program flow chart. In the following phrases, which does not belong to the basic control structures that contain?_____.
A) sequence structure B) condition structure
C) selection structure D) execution structure
(81) M.Jackson suggested the data structure oriented software design method. Which of the following structure can be introduced by using input/data structure?_____. (2 points)
A) algorithm structure B) procedure structure
C) code structure D) program structure
(82) Software testing is acomplicated procedure.In the following testing method,which is the basic test lf software testing?_____.
A) system testing B) effective testing
C) element testing D) integrated testing
(83) Typical MISD (multiple-instruction single-datastream) computing mode is_____.
A) Pentium Ⅱ B) Alpha C) Systolic D) Staran
(84) Local bus can reduce the occupation time of CPU. For the PCI local bus, commonly the time can be reduced to_____.
A) 46% B) 26% C) 16% D) 6%
(85) There are many page replacement algorithms in page management.The most frequently used algorithm is_____.
A) FIFO B) LRU C) OPT D) PPT
(86) The technology for carrying out multiple processing by means of multiple pipeline is called _____.(2 points)
A) Superscalar B) Superpipeline
C) Multiple pipeline D) Very long instruction word
(87) In most WANs ,the network contains numerous cables or telephone lines, each one connecting a pair of_____.
A) hosts B) routers C) servers D) networks
(88) Three concepts are central to the OSI model:Service,Interface and_____.
A) Iayers B) Applications C) Protocols D) Networks
(89) The underlying technology that makes B-ISDN is called_____.
A) ATM B) Frame relay
C) SDMS D) X.25 Networks
(90) URLs have three parts: the DNS name of machine on which the page is located,then a local name uniquely indicating the specific page and_____. (2 points)
A) protocol B) IP address
C) Network name D) Server namehttp://m.shddsc.com/
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