Unless you work in a SCIF (and probably not even then) your local network should not be considered trustworthy. Assume that hostile activity is always present.

Unless you work in a SCIF (and probably not even then) your local network should not be considered trustworthy. Assume that hostile activity is always present. Especially if you have "appliance" type stuff on your LAN, such as ISP-provided routers, Amazon/Google devices, smart light bulbs, etc. Keep your machines and firewalls updated.