As shown in the configuration, the administrator has configured OSPF on R1, but R1 cannot learn the routes of other routers.
[R1] ospf
[R1-ospf-1] area 1
[R1-ospf-1-area-0.0.0.1] network 10.0.12.0 0.0.0.255
The possible reason is (). (Multiple Choice)
A . This router is not configured with authentication, but the neighbor router is configured with authentication.
B . The OSPF process ID is not configured when this router is configured.
C . The area ID configured by this router is different from the area ID of its neighbor router.
D . This router does not announce the network connecting neighbors when configuring OSP
Answer: ACD