When configuring OSPF on a Tier-0 Gateway, which three of the following must match in order to establish a neighbor relationship with an upstream router? (Choose three.)
BCE.
B and E answer can be found in the explanation of the ICM 4.0, p229.
C answer can be found on the general prerequiste of the OSPF protocol to work correctly :
https://www.computernetworkingnotes.com/ccna-study-guide/ospf-neighborship-condition-and-requirement.html
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