Which device is located at the outermost part of an enterprise network?

The outermost part of an enterprise network is typically represented by the firewall (FW). A firewall serves as a critical security barrier between the internal network and external networks, such as the internet. It monitors and controls incoming and outgoing network traffic based on predetermined security rules. By filtering traffic, the firewall helps prevent unauthorized access, ensuring that only legitimate traffic can enter or leave the enterprise network.

In this context, placing the firewall at the outermost layer is important because it acts as the first line of defense against potential threats from outside sources. While routers can also be positioned at the edge of a network, their primary function is to direct traffic efficiently between different networks rather than to enforce security measures. Therefore, the firewall is the correct choice for denoting the outermost protective layer of an enterprise network infrastructure.