20xx年计算机等级四级笔试试卷-考试学习(编辑修改稿)内容摘要:
( 53)符合 标准的 Ether 网物理地址采用连续编码方法,它使用的地址长度为 A) 8bit B) 16bit C) 48bit D) 64bit ( 54)网络环境中实现分布式进程通信必须解决哪 3个主要的问题。 Ⅰ. 进程命名与寻址方法 Ⅱ. 多重协议的识别 Ⅲ. 协议转换 Ⅳ. 进程间相互作用的模式 A) Ⅰ 、 Ⅱ 和 Ⅲ B ) Ⅰ 、 Ⅱ 和 Ⅳ C) Ⅱ 、 Ⅲ 和 Ⅳ D ) Ⅰ 、 Ⅲ 和 Ⅳ ( 55) 10Gbps Ether 与 10Mbps、 100Mbps 和1Gbps Ether 采用了完全相同的 Ⅰ. 帧格式 Ⅱ. 逻辑链路控制子层协议 Ⅲ. 物理层标准 Ⅳ. 数据编码方法 A) Ⅰ 和 Ⅱ B ) Ⅰ 、 Ⅱ 和 Ⅲ C) Ⅱ 和 Ⅳ D ) Ⅱ 、 Ⅲ 和 Ⅳ ( 56) What is the decimal value of the binary value 10010。 A) 16 B) 17 C) 18 D) 19 ( 57) In a puter, which of the following is the longest period。 A) Beat period B) Machine period C) Instruction period D) CPU period ( 58) Which of the following is not an AVL tree? ( 59) Traversing a binary tree in preorder is equivalent to A) Traversing the forest corresponding to the binary tree in rootfirst order. B) Traversing the forest corresponding to the binary tree in rootlast order. C) Traversing the forest corresponding to the binary tree in breadthfirst order. D) None of the above. ( 60) Which of the following methods is used to increase the number of processes sharing the CPU。 A) Interrupt B) Scheduler C) Swapping D) Working Set ( 61) Which of the following statements describe(s) the properties of a purely segmented memory system? Ⅰ . It divides memory into units of equal size Ⅱ . It permits implementation of virtual memory Ⅲ . It suffers from internal fragmentation A) Ⅰ only B ) Ⅱ only C) Ⅲ only D ) Ⅰand Ⅲ ( 62) As an important phase in software development, software design is the continuation of software requirement analysis phase. Ⅰ . software structure Ⅱ . software procedure Ⅲ . software module Ⅳ . software document which of the following should be included in software design phase? A) Ⅰand Ⅱ B ) Ⅱand Ⅲ C) Ⅰ,Ⅱ and Ⅲ D ) All ( 63) White box testing of software testing is a test for software structure. Which of the following item should not be included in the content of white box? A) boundary value analysis B) statement testing C) branch testing D) path testing ( 64) Consider a relation R ( A, B, C, D ) with the following dependencies: AB ? C, CD ? E, DE ? B. A candidate key of this relation is A) AB B) ABC C) ABD D) ABE ( 65) Let R and S be the following relations: A) 3 B) 4 C) 5 D) 6 ( 66) The Pentium includes hardware for both segmentation and paging. Both mechanisms can be disabled, allowing the user to choose from four distinct views of memory. Now the most frequently used view(such as Unix System V) is A) Unsegmented unpaged memory B) Unsegmented paged memory C) Segmented unpaged memory D) Segmented paged memory ( 67) ASCII is a 7bit code used to represent numeric, alphabetic, and special printable characters. It also includes codes for control characters, which are A) printable or displayable B) not printable or display。20xx年计算机等级四级笔试试卷-考试学习(编辑修改稿)
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