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Refer to the exhibit. An engineer is securing a customer's network. Which command completes this configuration and the engineer must use to prevent a DoS attack?
Correct Answer: C
The TTL security mechanism is used to protect a router from receiving BGP sessions that are not originated from the expected peer. It drops incoming TCP segments whose TTL value is not equal to or greater than the expected minimum value, thus helping in preventing DoS attacks that could be initiated from an unauthorized source pretending to be a legitimate BGP peer. Reference := Implementing and Operating Cisco Service Provider Network Core Technologies