4 x Cisco 2500 routers

• each router has one Ethernet and two serial interfaces

• one of the 2500’s, router1, has an ISDN BRI interface

1 x Cisco 2600 router (identified as router2)

• has one Ethernet interface

• has both an ISDN BRI and a PRI interface

2 x Catalyst 1912 switches

• each switch has twelve 10baseT and two Fast Ethernet ports

2 X Catalyst 2950 switches

• each switch has twelve 10/100 Ethernet ports

2 x  PC’s