Yes, and whatever other devices you have on your network. If you have a family that could include information about your kids (even potentially medical information). If you're working on a personal project and decide to make a VM on your own personal computer and temporarily name the VM's hostname "fuckyoudns" while troubleshooting something, your company could see that and potentially build an internal profile on you that could lead to you being fired.
Of course no company would admit to firing you because of that but it plants a seed on their end and if it came down to (2) employees of equal skill and one of them doesn't have aggressively named personal VMs, you're put at a disadvantage for something you did on your own time on a Sunday afternoon while learning more about networking.
You could also flip this and ask if you worked at a physical office and your work machine never left the office, should your employer keep tabs on your local network at home for a typical software development position? Would it be expected for them to demand they install a black box with video, audio and external network capabilities on your home network saying if you don't install this, work access will be suspended and ultimately you'll be fired?
