i have a router 7200 connected(g0/2) with switch 3550(g0/12). I have on my switch 3 vlans. So i did the following:1. The interface of switch(g0/12) to trunk mode encapsulation dot1q 2. I create 3 subinterfaces (g0/2.1, g0/2.2,g0/2.3)on the router wit...