In ingress filtering, the firewall examines packets entering the network from the outside.

• A. Ingress
• B. Egress
• C. Both A and B
• D. Neither A nor B

Answer: (A)

Inbound traffic inspection is the essence of ingress filtering. Ingress filtering focuses on packets that are entering the network from outside, so the firewall inspects these inbound packets to enforce policies, block unauthorized access, and prevent spoofed or unwanted sources from reaching internal hosts. Egress filtering, by contrast, handles outbound traffic leaving the network. Some setups enforce both directions, but the term ingress filtering specifically targets inbound traffic, making it the correct description here.