Depends on what you consider "work from home". You might not be able to chat with your co-workers without a WAN connection (unless you go really old-school and use a telephone), but you can for instance develop software from home without any working network connection (and git makes it easier by allowing you to create commits while offline; see also the "git bundle" subcommand). I've done so occasionally when the Internet connection goes kaputt.
Depends on what you consider "work from home". You might not be able to chat with your co-workers without a WAN connection (unless you go really old-school and use a telephone), but you can for instance develop software from home without any working network connection (and git makes it easier by allowing you to create commits while offline; see also the "git bundle" subcommand). I've done so occasionally when the Internet connection goes kaputt.