The current corporate networks often use OSPF as the routing protocol, then use OSPF doing routing protocol, which of the following issues should be paid attention to? (Multiple choice)

 The current corporate networks often use OSPF as the routing protocol, then use OSPF doing routing protocol, which of the following issues should be paid attention to? (Multiple choice)
A .  Confirm that the backbone area will not split
B .  Confirm whether there will be sub-optimal routes in the network under the OSPF routing rules
C .  Confirm that all non-backbone areas and backbone areas have correct and reliable links
D .  Confirm the topology of the OSPF network to ensure that OSPF does not have loops during route calculation
E .  Confirm that OSPF ‘s COST can correctly reflect the real bandwidth of links above 100M

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Answer: ABCE