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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