networking - Routing in home LAN

I'm trying to understand some basic concepts of networking. I have following home LAN:

1. Is it right (like above) to have 2 NIC's each one having 2 different gateways on one station? There PC2 have 2 NICs - the first's one gateway is 192.168.0.1 the second's 192.168.1.1?


2. 
   

   Initially (just after system startup) the ip table is like that:

   
   

   192.168.0.0    255.255.255.0         On-link      192.168.0.11    276
   192.168.0.11   255.255.255.255       On-link      192.168.0.11    276
   192.168.0.255  255.255.255.255       On-link      192.168.0.11    276 
   

   
   

   and when i run netcat:

   
   

   nc -zv -s 192.168.0.11 192.168.0.11 80 
   

   
   

   to test if port 80 is open it works - the port 80 is indeed open. But when i remove the 192.168.0.11 route i got "TIMEOUT" on nc test. Shouldn't it pick 192.168.0.0 route and work? Moreover when i add the route manually:

   
   

   route add 192.168.0.11 mask 255.255.255.255 0.0.0.0 it still doesn't work!

   
   


3. 
   

   I can't change the metric to desired value. When i run for eg.
   route change 192.168.0.11 mask 255.255.255.255 192.168.0.11 metric 500
   the result metric is't 500 but 520! (no matter if auto-metric is enabled or not)?

   
   


4. Is there any connection between -s flag (local source address) in netcat and routing table's Interface column?