As such, then it’s easy to see how these three different components work together. While the switch manages data being transferred across the network, it also ensures that information is sent to the right place. This guarantees that no data is sent to the wrong system while still providing the bridge for your network to operate effectively. Of course, this only manages the internal network. To connect to the internet, you need a router system, connecting to other networks and allowing you to transfer data packets.
At this point, there is data being transferred from outside of what should be a secure internal network. The firewall then essentially acts as a gatekeeper checking and keeping tabs on data coming into your internal network. Any dangerous data from viruses to unauthorized content should be vetted and blocked. Be aware that a physical firewall is not the same as the typical software that you can purchase for your computer system. Although, both do have the same basic purpose. Without a firewall, traffic will blindly be passed between two separate networks and this can lead to issues with unauthorized data passing through.
More info: router vs switch
