The host level is represented with host-based security solutions that are aimed towards protecting a certain host. However, network-based solutions are aimed towards protecting the whole network or its parts (or groups of hosts). We would like to start the chapter with network-based solutions.
In order to imitate a real network and to protect our lab from access from an external network, we need to implement access control measures between our various lab VLANs on the network level. The access control mechanism that we are going to use is called access control lists (ACLs) and can be implemented on the core router.