Barbara is investigating an attack against her network. she notices that the internet control message protocol (icmp) echo replies coming into her network far exceed the icmp echo requests leaving her network. what type of attack is likely taking place?

The attack that Barbara investigates is most likely a smurf.
Characteristic of the smurf attack is that ICMP packets with the intended victim's spoofed source IP are broadcast to a computer network using an IP broadcast address and as a result the internet control message protocol (ICMP) echo replies coming into her network far exceed the ICMP echo requests leaving her network.