ICMP is a $($an$)\_\_\_\_\_\_\_\_\_$ layer protocol.

Question $17$Answer

a$.$

network$-$layer protocol.

b$.$

application$-$layer protocol that helps TCP$/$IP at the network layer

c$.$

data$-$link layer protocol that helps TCP$/$IP at the network layer

d$.$

transport$-$layer protocol that helps TCP$/$IP at the network layer