2. 计算机
  3. Refer to the graphic． R1 is unable to establish an OSPF neighbor relationship with R3． What are possible reasons for this proble

Refer to the graphic． R1 is unable to establish an OSPF neighbor relationship with R3． What are possible reasons for this proble

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问题 Refer to the graphic． R1 is unable to establish an OSPF neighbor relationship with R3． What are possible reasons for this problem?
选项 A、        All of the routers need to be configured for backbone Area 1．
B、        R1 and R2 are the DR and BDR, so OSPF will not establish neighbor adjacency with R3．
C、        A static route has been configured from R1 to R3 and prevents the neighbor adjacency from being established．
D、        The hello and dead interval timers are not set to the same values on R1 and R3．
E、        R1 and R3 are configured in different areas．
答案D,E
解析 影响OSPF邻居形成的几个因素：区域ID，hello时间，网段，认证等。
A：所有的路由器需配置在区域1,错误
B：R1/R2是DR/BDR，所以OSPF不会和R3建立邻居关系．
C：配置了静态路由保护了邻居的建立，错误。
D：hello包周期不一致，正确
E：R1和R3配置了不同的区域。正确。
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