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全国计算机等级考试四级笔试试题二(下)(二)
(发布时间:2007-6-27 20:41:00 来自:模考网)

  Ⅲ.网费计算                       Ⅳ.网络系统的安全性服务
  A) Ⅰ和Ⅱ       B) Ⅰ、Ⅱ和Ⅲ        C) Ⅰ、Ⅱ和Ⅳ      D) 全部

  (54) 源路选网桥由发送帧的源结点负责路由选择。源结点在发送帧时需要将详细的路由信息放在____。
  A) 网络层地址    B) 帧的校验字段  C) IP地址        D) 帧的首部

  (55) 一台Internet主机至少有一个IP地址,而这个IP地址是全网唯一的。如果一台Internet主机有两个或多个IP地址,则该主机属于两个或多个____。
  A) 逻辑网络  B) 浏览器/服务器结构  C) 通信子网      D) 操作系统

  (56) In a computer,if a logical left shift of the operand occurs,its lowest bit is____.
  A) 1    B) unchanged            C) 0     D) random

  (57) The CPU is composed of two components,which are____.
  A)arithmetic logic unit and controller 
  B)memory and controller
  C)arithmetic logic unit and memory
  D)controller and storage

Items 58 and 59 are based one the following hash table.
Hash function is:  h(key) = key mod 13
Collisions are solved by using open addressing, linear probing.
  (58) Load factor α of the hash table is approximately____.
  A) 0.28        B) 0.35         C) 0.54          D) 0.71

  (59) How many key comparisons are needed in searching for key value 38?____.

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