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Pretty much every protocol used for malicious traffic and Trojans is also used for legitimate traffic. You cannot block all bad traffic just by filtering on protocols.

When given that ICMP and HTTP are both allowed, if you have to block one, block ICMP.

Choices were:

DNS

DHCP

ICMP

HTTP

https://library.skillport.com/courseware/cbtlib/TPSY0201/metadata/eng/TPSY0201B.htm?

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Q: What computer protocol should be blocked to prevent malicious traffic and Trojan's?
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