The Network Architect has given you specifications for designing a network for a new customer. Implement the design as best you can.
Within the entirety of the specifications is a single mistake made by the Network Architect.
Identify and correct the mistake within the network.
The network needs to be running by the end of the day.
For the purposes of this exercise we will pretend that our ISP has given us a public IP of within their /24 network, and our next hop to the internet through our ISP is

1. Study the physical network device diagram. Understand the port requirements for each device.
The lightening shaped red lines connecting the routers indicate a T1 connection via the CSU/DSU interfaces of the WAN card(s) of each router. The black lines indicate Ethernet connections.
2. Rack the network devices in a logical manner. Plug in the necessary cabling per the diagram.
3. Confirm you can access all devices via console.
4. Configure each router so that domain name lookups are not attempted when typing in an incorrect command. Configure each router so that syslog messages in the console do not interrupt your commands while consoled in or connected via a VTY line.
5. /25 has been allocated to allow L3 Ethernet connectivity between each network device. has been allocated to allow L3 T1 connectivity between routers. Subnet these networks with the goal of saving as much address space as possible and configure the interfaces so that each router can ping the other router(s) they are directly connected to via their T1 and Ethernet interfaces. Use PPP as the encapsulation method for all T1 connections. Add helpful descriptions to the interfaces.
6. Build the necessary static routes allowing routers to communicate to each other through all subnets you created with the address space given in step 3 for both Ethernet and T1 links. Make sure to prefer the Ethernet links over the T1s. Use the most specific masks possible.
7. All other traffic should go out to the ISP’s address of via the Ethernet connections.
Remember that is your only public IP. If the Ethernet connection between the routers fails the T1 connections should be a backup. Test reachability between all routers via ICMP and confirm failover to the T1s properly routes traffic in the case of an Ethernet failure between the routers.
8. Configure necessary commands for devices to be reachable via SSHv2. Make sure to stop connectivity via telnet.
9. Use the local database to build yourself credentials to all routers and confirm SSH works to and from all routers.
10. Add the Network Architect’s credentials to all routers. He has provided you the MD5 hash of his current password from another device. His username should be jhilbert and he needs full access to the device. MD5 hash— $1$J.I6$uxyzzaE1BlhdVAP1ppsPQ0
11. Save the running configurations of all routers to the startup configurations.
12. Save the running configurations of all routers to a tftp server set up on your computer.