(Solved): Help me add something maybe a firewall or any other method that i can use to make sure pc0 can commu ...

Help me add something maybe a firewall or any other method that i can use to make sure pc0 can communicate with pc1 and pc2 but pc1 and pc2 cannot communicate with pc0 please do asap i will upvote. Please do it in cisco packet tracer and give detailed steps i will upvote