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- ● 如果子网172.6.32.0/20被划分为子网172.6.32.0/26，则下面的结论中正确的是（70）。 （70）A．被划分为62个子网
- B．每个子网有64个主机地址
- C．被划分为31个子网
- D．每个子网有62个主机地址
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- ● At a basic level, cloud computing is simply a means of delivering IT resources as（71）．Almost all IT resources can be delivered as a cloud service: applications, compute power, storage capacity, networking, Programming tools, even communication services
- Cloud computing began as large-scale Internet service providers such as Google, Amazon, and others built out their infrastructure. An architecture emerged: massively scaled, （73）distributed system resources, abstracted as virtual IT services and managed a
- Both clouds and grids are built to scale horizontally very efficiently. Both are built to withstand failures of （75） elements or nodes. Both are charged on a per-use basis. But while grids typically process batch jobs, with a defined start and end point,
- B. computers
- C. services
- D. software （72） A. computers
- B. disks
- C. machines
- D. tools （73） A. horizontally
- B. vertically
- ● 网络的可用性是指（68）。 （68）A．网络通信能力的大小
- B．用户用于网络维修的时间
- C．网络的可靠性
- D.用户可利用网络时间的百分比
- ● SMTP传输的邮件报文采用（67）格式表示。 （67）A. ASCII
- B. ZIP
- C. PNP
- D. HTML
- ● 以下关于网络中各种交换设备的叙述中，错误的是（66）。 （66）A．以太网交换机根据MAC地址进行交换
- B．帧中继交换机只能根据虚电路号DLCI进行交换
- C．三层交换机只能根据第三层协议进行交换
- D. ATM交换机根据虚电路标识进行信元交换
- ● 若n<SUB>2</SUB>、n<SUB>1</SUB>、n<SUB>0</SUB>分别表示一个二叉树中度为2、度为1和叶子结点的数目（结点的度定义为结点的子树数目），则对于任何一个非空的二叉树，（59） 。 （59）A．n<SUB>2</SUB>一定大于n<SUB>1</SUB>
- B．n<SUB>1</SUB>一定大于n<SUB>0</SUB>
- C．n<SUB>2</SUB>一定大于n<SUB>0</SUB>
- D. n<SUB>0</SUB>一定大于n<SUB>2</SUB>
