[单选] You have just completed an OSPF implementation. While executing your verification plan, you determine that R1 is not able to establish full OSPF adjacency with R2. The show ip ospf neighbor comman d output on R1 shows that R2 is stuck in the INIT state. What could be the cause of this problem?（）

A . DR and BDR election errors between R1 and R2.
B . The R2 router has not received the OSPF hello packets from the R1 router.
C . Mismatched interface ma ximum transmission unit (MTU) configuration between the R1 and R2.
D . Mismatched OSPF hello interval configuration between the R1 and R2
E . Corrupted LSAs exchanges between the R1 and R2.

逻辑思维，又称抽象思维，是以抽象概念和推论为形式的思维活动。资本主义再生产周期的决定性阶段是（）阶段。萧条。高涨。危机。复苏。河北省委原书记、省人大常委会原主任周本顺“在重大问题上发表违背中央精神的言论”，这一行为应给予（）处分。严重警告。撤销党内职务。留党察看。开除党籍。 Refer to the exhibit. Which statement about the authentication process is true？（） The LIST1 list will disable authentication on the console port.。 Because no method list is specified， the LIST1 list will not authenticate anyone on the console port.。 All login requests will be authenticated using the group tacacs+ method.。 All login requests will be authenticated using the local database method.。 The default login authentication will automatically be applied to all login connections.。齿轮齿面损坏的主要形式有（）。点蚀。胶合。塑性变形。磨损。断裂。 You have just completed an OSPF implementation. While executing your verification plan, you determine that R1 is not able to establish full OSPF adjacency with R2. The show ip ospf neighbor comman d output on R1 shows that R2 is stuck in the INIT state. What could be the cause of this problem?（）

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