Firewall examines every packet in a session, a firewall can detect application Error.
Step-by-step explanation:
Firewall is a network guard system It guide and control the incoming and outgoing signals. It creates a wall between an internal reliable source and an outside unreliable source. The firewall helps to protect the application by checking every pack in the session.
Packet filtering firewall present in the network layer. It observes and filters the network traffic between the internet and application. It operates as the gateway for the application and saving it from external threads outside the network.