topology exhibit：    You work as a network engineer at . is a large international company with offices on all continents. You work at the Chicago Office. Your boss at ，Miss ，has asked you to install a Catalyst 3500 to provide for another 24 users. Your instructions are as follows：  * install it in an IDF  * extremely import to have the proper configuration of the Catalyst before it is placed into the product information  * it should not participate in VTP  * it should forward VTP advertisements that are received on trunk ports  * all nontrunking interfaces， Fa0/1 to Fa0/24） should immediately to the forwarding state of the Spanning tree.  * configure all Fast Ethernet ports （the user ports） such as they are nontrunking.  * the fastEthernet interfaces 0/12 through 0/24 should be placed in VLAN 20