These two networks are on the first and second floor of the same building. How would the switches be connected physically? How would the connecting ports need to be configured?
- Are they on related subnets (i.e., 192.168.xxx.yyy and 192.168.xxx+1.yyy)? Then simply setting the subnet to 255.255.254.0 and using the same gateway would connect them.
- Do they both have separate ISP/Internet connections with addresses provided by the ISP? Then you could set trust relationships between the domains.