Smurf attack or ping attack

Smurf attack or ping attack:     This is where an illegitimate ‘attention request’ or Ping is sent to a system, with the return address being that of the target host (to be attacked). The intermediate system responds to the ping request but responds to the unsuspecting  victim system. If the receipt of such responses becomes excessive, the target system will be unable to distinguish between legitimate and illegitimate traffic.