Which best practice can limit inbound TTL expiry attacks?
A. Setting the TTL value to more than the longest path in the network
B. Setting the TTL value to zero
C. Setting the TTL value to less than the longest path in the network
D. Setting the TTL value equal to the longest path in the network
https://tools.cisco.com/security/center/resources/ttl_expiry_attack.html
FIltering packets with TTL values of six and below means SETTING the filter value to ‘ttl lt 7’ . It is not clear what the answers mean by ‘Setting the TTL value to something’. So the correct answer is completely undecidable.