ICMP Protocol::-

  ICMP is an OCI security list is used to control ICMP based network Traffic , such as PING and Network Error Messages ,
    by defining rules based on the source , Destination , ICMP type & ICMP code...

ICMP :- (PING) command to check the protocol. it's a two way communication (for testing purpose only)

                 To check the connections..(Not most reliable in industry.)

Port ::- Giving a Specific destination..(Network [port used for communications) such as 22 , 80 or 443.

           Http >> 80 >> Insecure. ///  Https >> 443 >> Secure.

Example::- When you run the PING command...

ping 0.0.0.0/0

Source     : 0.0.0.0/00/0
Protocol   : ICMP
ICMP Type  : 8 (Echo Request)
ICMP Code  : 0

THANKYOU !