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Covert Channels are nontraditional communication paths. What protocol can be used to create a covert channel using type 8 and 0?
UDP
ICMP
TCP
BGP
ICMP is the correct answer. Type 8 is IPv4 Echo request and type 0 is the echo response. ICMP tunneling works by injecting arbitrary data into an echo packet sent to a remote computer. The remote computer replies in the same manner, injecting an answer into another ICMP packet and sending it back. The client performs all communication using ICMP echo request packets, while the proxy uses echo reply packets. (TK) https://en.wikipedia.org/wiki/ICMP_tunnel
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