You're configuring a firewall to filter traffic based on the OSI Model. Which layers would you focus on to control access effectively?

When configuring a firewall, focusing on the Network Layer (Layer 3) is crucial for controlling access effectively. This layer deals with IP addresses, routing, and logical addressing, allowing you to set rules based on source and destination IP addresses, subnets, and ports. The Transport Layer (Layer 4) is also essential, as it manages end-to-end communication and can filter traffic based on protocols such as TCP or UDP ports. However, the Network Layer is the primary layer for firewall access control.