WannaCry infected other machines through the LAN. That made me think of how we use the LAN at our office: The traffic is client<->server, client<->internet, and server<->internet - never client<->client.
What would be an easy way block client<->client traffic? E.g. is it possible to make a 24-port switch regard the first 20 ports as client ports between which the traffic is blocked, and make the last 4 ports be regarded as server/internet ports which can talk to any other port?