●关于OSPF协议相比RIP V2路由协议作的改进，下面的描述中不正确的是__(61)__。
（61）A．不存在跳数的限制
B．路线更新采用增量更新
C．协议本身可以防环
D．采用了组播方式

●802.11标准定义了3种物理层通信技术，这3种技术不包括__(62)__。
（62）A．直接序列扩频
B．跳频扩频
C．窄带微波
D．漫反射红外线

●关于Windows操作系统中DHCP服务器的租约，下列说法中错误的是__(63)__。
（63）A．默认租约期是8大
B．客户机一直使用DHCP服务器分配给它的IP地址，直至整个租约期结束才开始联系更新租约
C．当租约期过了一半时，客户机将与提供IP地址的DHCP服务器联系更新租约
D．在当前租约期过去87.5%时，如果客户机与提供IP地址的DHCP服务器联系不成功，则重新开始IP租用过程

●确定网络的层次结构及各层采用的协议是网络设计中__(64)__阶段的主要任务。
（64）A．网络需求分析
B．网络体系结构设计
C．网络设备选型
D．网络安全性设计
 

●在IPv4中，组播地址是__(65)__地址。
（65）A．A类
B．B类
C．C类
D．D类

●WLANs are increasingly popular because they enable cost-effective connections among people，applications and data that were not possible，or not cost-effective，in the past.For example，WLAN-based applications can enable fine-grained management of supply and distribution __(66)__ to improve their efficiency and reduce __(67)__.WLANs can also enable entirely new business processes．To cite but one example，hospitals are using WLAN-enabled point-of-care applications to reduce errors and improve overall__(68)__care．WLAN management solutions provide a variety of other benefits that can be substantial but difficult to measure.For example，they can protect corporate data by preventing__(69)__through rogue access points.They help control salary costs，by allowing IT staffs to manage larger networks without adding staff.And they can improve overall network management by integrating with customers’existing systems，such as Open View and UniCenter.Fortunately，it isn’t necessary to measure these benefits to justify investing in WLAN management solutions，which can quickly pay for themselves simply by minimizing time-consuming__(70)__and administrative chores.
（66）A．chores
B．chains
C．changes
D．links
（67）A．personnel
B．expenses
C．overhead
D．hardware
（68）A．finance
B．patient
C．affair
D．doctor
（69）A．intrusion
B．aggression
C．inbreak
D．infall
（70）A．exploitation
B．connection
C．department
D．deployment