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Refer to the exhibit. An attacker can advertise OSPF fake routes from 172.16.20.0 network to the OSPF domain and black hole traffic. Which action must be taken to avoid this attack and still be able to advertise this subnet into OSPF?
Correct Answer: B
To protect the OSPF domain from fake route advertisements and black hole traffic, it is essential to implement route filtering. By applying a policy to filter OSPF packets on R2, you can prevent the propagation of unauthorized OSPF routes. This action allows only legitimate routes to be advertised into the OSPF domain while blocking any malicious route injections. Route filtering is a critical security measure in OSPF configurations to maintain the integrity of routing information within the network1.