单项选择题
You deployed new fibers in your network to replace copper spans that were too long. While reconnecting the network， you experienced network problems because you reconnected wrong fibers to wrong ports. What could you do to prevent this type of problem in the future， particularly when connecting and reconnecting fiber pairs？（）
A.Only use fiber in pairs. B.Configure root guard on your switches. C.Do not use fiber but use copper. D.Configure UDLD to prevent one-way link conditions.
问答题 在配EIGRP的时候（frame-relay的NBMA）命令router（config-router）#neighbor192.168.1.129是什么意思呢？
问答题 问有哪些路由协议在路由条目发生变化时只做部分更新，并且使用比较低的链路带宽？
单项选择题 NetworkAhasaspanning-treeprobleminwhichthetrafficisselectingalongerpath.Howisthepathcostcalculated？（）
