题目内容

从逻辑角度看，大型网络可分为核心层、汇聚层和接入层，以下描述正确的是 (56) 。

A. 核心层负责数据包的复杂计算
B. 核心交换机之间可进行Port Trunking
C. 接入层实现网络的访问策略控制
D. 汇聚层完成MAC层过滤和网段微分

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使用netstat-an命令可显示所测试网络的 (42) 。

A. IP、ICMP、TCP、UDP协议的统计信息
B. 以太网统计信息
C. 以数字格式显示所有连接、地址及端口
D. 显示与每个连接相关所属进程ID

______ (既然这事情非常紧急)，we dealt with it immediately．

耕地占补平衡，实行占用耕地的建设用地项目与补充耕地的土地开发整理项目挂钩制度。( )

A. 对
B. 错

Bluetooth is a universal radio interface in the (71) frequency hand that enables portable electronic devices to connect and communicate wirelessly via short-range, ad hoc networks. Each unit can simultaneously communicate with up to (72) other units per piconet. Moreover, each unit can simultaneously (73) to several piconets. Eliminates the need for wires, cables and connectors for and between cordless or mobile phones, modems, headsets, PDAs, Computers, printers, projectors, local area networks, and so on, and paves the way for new and completely different devices and applications. Technology Characteristics (74) symbol rate exploits maximum available (75) bandwidth。

A. server
B. firewall
C. clinet
D. router