A network administrator is troubleshooting the OSPF configuration of routers R1 and R2． The routers cannot establish an adjacency relationship on their common Ethernet link． The graphic shows the output of the show ip ospf interface e0 command for routers R1 and R2． Based on the information in the graphic, what is the cause of this problem?
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【正确答案】 1、D    
【答案解析】OSPF邻居建立过程中有几个参数是需要严格匹配的：Hello time和dead time，Area id, MTU,特殊区域标识符。然后比较图中的R1和R2的内容可以看到他们的Hello time 和dead time是不同的，因此他们的邻居关系是无法建立的。