two subnets thru same wire

[Shiraz Baig]

My question realtes the fact, whether we can have two
subnets passing thru same wire and communicating with
each other. The two subnets are: 
                  -----------------
                  |     Hub       |
                  -----------------
                   |    |   |   |
  -----------------     |   |   ---------------
  |              -------    -------            |
  |              |                |            |
  192.168.10.3   |                |       192.168.11.5
      A      192.168.11.3      192.168.10.5    D
                  B                 C             

   It is a six port Hub. Four hosts with IP addresses
given above are attached to the hub. There are two
subnets 192.168.10.0 and 192.168.11.0. 
The netmask is 255.255.255.0 in all cases.

Q1: Will Host A be able to talk to Host C?
Q2: Will Host B be able to talk to Host D?
Q3: If the communication is possible, are there likely
to be any problems?
Q4. If instead of switch, we use hub, will it make any
difference?



		
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