Which OSPF network types are compatible and allow communication through the two peering devices?

• A. point-to-multipoint to nonbroadcast
• B. broadcast to nonbroadcast
• C. point-to-multipoint to broadcast
• D. broadcast to point-to-point

Explanation: The following different OSPF types are compatible with each other:
+ Broadcast and Non-Broadcast (adjust hello/dead timers)
+ Point-to-Point and Point-to-Multipoint (adjust hello/dead timers)
Broadcast and Non-Broadcast networks elect DR/BDR so they are compatible. Point-topoint/ multipoint do not elect DR/BDR so they are compatible.

Reference: https://www.freeccnaworkbook.com/workbooks/ccna/configuring-ospf-network-types

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