[单选]
Refer to the exhibit. OSPF is configured on all routers in the network. On the basis of the show ip ospf n eighbor output, what prevents R1 from establishing a full adjacency with R2? （）

A . Router R1 will only establish full adjacency with the DR and BDR on broadcast multi- access networks.
B . Router R2 has been elected as a DR for the broadcast multiaccess network in OSPF area 1.
C . Routers R1 and R2 are configured as stub routers for OSPF area 1 and OSPF area 2.
D . Router R1 and R2 are configured for a virtual link between OSPF area 1 and OSPF area 2.
E . The Hello parameters on routers R1 and R2 do not m atch.

皮下出血《普通教育学》(赫尔巴特) 三严三实是指什么？工程建设定额按生产要素分类可以分为（）。施工定额、预算定额和概算定额。建筑工程定额、安装工程定额和其他专业定额。劳动消耗定额、机械消耗定额和材料消耗定额。投资估算指标、概算指标和预算定额。 Which of the following statements correctly describes the characteristics of a Frame Relay point-to-point subinterface?（） Needs to use Inverse ARP.。 Maps a single IP subnet per DLCI.。 Maps a single IP subnet across multiple DLCIs.。 Resolves NBMA (non broadcast multi access) split horizon issues.。 Requires use of the frame-relay map command.。 None of the above。

Refer to the exhibit. OSPF is configured on all routers in the network. On the basis of the show ip ospf n eighbor output, what prevents R1 from establishing a full adjacency with R2? （）

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[单选] Refer to the exhibit. OSPF is configured on all routers in the network. On the basis of the show ip ospf n eighbor output, what prevents R1 from establishing a full adjacency with R2? （）

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[单选]
Refer to the exhibit. OSPF is configured on all routers in the network. On the basis of the show ip ospf n eighbor output, what prevents R1 from establishing a full adjacency with R2? （）