2012年思科认证考试备考的朋友，不用为了查找复习资料而烦恼，小编特为广大考生朋友们搜集了有关2012年思科认证（CCNA）考试练习题精选

，帮助大家复习，祝大家考试顺利。
　　　　
81. What is the maximum allowable number of hops in Enhanced Interior Routing GatewayProtocol? (在增强内部路

由网关协议中，最多允许多少个跳计数.？

　　A. 64

　　B. 224

　　C. 128

　　D. 232

　　E. 256

　　
82. Enhanced Interior Routing Gateway Protocol uses which of the following (增强内部路由选择网关协议使用下列

的哪一种.？

　　A. Link-state vector

　　B. Diffusion Update Algorithm

　　C. Distance vector

　　D. A and B only

　　E. B and C only
　　　
　　
83. What are three objectives for a routing protocol (路由选择协议的3个目标是什么.？

　　A. Accuracy

　　B. Quick holddowns

　　C. Rapid Convergence

　　D. Low overhead

　　
84. Define convergence (定义收敛.。

　　A. Convergence is the updates that are triggered by network changes

　　B. Convergence is the process of sending 呼叫packets

　　C. Convergence is two routers merging their routing tables into one

　　D. Convergence is the synchronizing of all routing tables on the internetwork, or simply the

synchronization of a single route change across all routers.

　　
85. Why are dynamic routing protocols considered dynamic (为什么动态路由选择协议考虑动态.？

　　A. Because each route is dynamically selected for each packet with a destination network not attached to

the router。

　　B. Because new routes are dynamically recomputed whenever there is a change in the nternetwork topology

　　C. Because convergence happens faster

　　D. Because all the routes remain the same no matter what changes happen on the network