ICMP Tunneling

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Q: William is learning about ICMP tunneling and needs to know which of the below statements does not represent a fact about this covert connection technique. Which of the below does not apply to ICMP tunneling?

a. You can use ping requests and replies in order to tunnel complete TCP traffic.

b. You can use it to tunnel another protocol via ICMP (Internet Control Message Protocol).

c. You can use it to bypass firewalls because they will not restrict ICMP packets.

d. You can use it to send ICMP packets in an encrypted form over an HTTP port.

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