What are two methods to make the OSPF routing protocol more secure? (Choose two.)
- Use only OSPFv3.
- Use MD5 authentication.
- Use the enable secret command.
- When feasible, create a VPN tunnel between each OSPF neighbor adjacency.
- Use the passive-interface command on LAN interfaces that are connected only to end-user devices.
Exam with this question: CCNA 3 Final Exam Answers
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