Consider the various uses for network devices like routers, switches, hubs, repeaters, etc. and how one or more of them would aid situations where network performance is degraded. Next, describe a scenario in which this has occurred, including the number of workstations and servers, how the work has been impacted by the degraded performance of the network, and other key points of detail as needed.
Then describe your solution to the problem, including details like device replacement, settings analysis and potential changes, and any other relevant details. Include, briefly, how you would prevent this from occurring again in the future, or at least limit the likelihood of it happening again.