Question

Advantages and disadvantages of firewall

Answer 1

firewall protect the computer from virus
it helps to keep computer secure

disadvantage
sometime new virus attack the computer which cannot be detected by the firewall

Answer 2

the biggest advantage-- of packet filtering firewall is cost lower resource usage and best suited for similar networks.

the disadvantages-- packet filtering firewall can work only on the network layer and these firewall do not support complex rule based model.