ICMP Attacks

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Q: Gary is a security administrator. He notices an inordinate amount of ICMP Echo Reply packets being received on the external gateway interface while watching the IDS. After looking into it further, he sees that the ICMP Echo Reply packets are originating from the Internet and there aren’t any requests from the internal host. What kind of attacks could cause this issue?

a. DoS attack

b. Land attack

c. Fraggle attack

d. Smurf attack

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