CompTIA PenTest+ PT0-002 Practice Question

A router primarily operates at layer 3 (the Network layer) of the OSI model and is designed to connect multiple subnets and direct data packets between them. Routers use IP addresses to make forwarding decisions and can allow or restrict traffic between subnets. In contrast, switches typically operate at layer 2 (Data Link layer) and handle traffic within the same subnet. Hubs, being even more limited, operate at layer 1 (Physical layer) and merely replicate traffic to all ports. Firewalls, though they can restrict traffic between subnets, are not inherently responsible for allowing communication at the network layer but rather for securing the network by applying policies.