Secure "Lab" Computer

I'm planning to set up a secure "lab" computer which I want to be
completely isolated from my home "LAN".


I was wondering if I can do this while sharing a connection to a cable
modem.



Could I:


A) Use two separate routers behind a single cable modem

or

B) Split the connection from the ISP to two separate cable modems.



If I use a single router's NAT to isolate the home LAN and the "lab"
computer, wouldn't it still be easy for a problem affecting the "lab"
computer to possibly damage the LAN? That's why I am thinking of some
kind of further "physical" separation might provide better isolation.





Thanks.

.

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