Security+ · 3.0 Security Architecture
ICMP
Internet Control Message Protocol. Ping and traceroute use it. Also carries 'destination unreachable' and 'time exceeded' diagnostics. Not TCP or UDP. its own IP protocol (1).
How this shows up at NCAE
Router ICMP is the lowest-value scored service (1× weight) at NCAE. Don't waste time perfecting it when higher-value services are red.
Error patterns associated with this term
Competition failures where this Security+ concept applies.