In the topology shown above I have a 4 routers locate in 4 different locations. One in New York, one in Boston and one in vegas. As well as one to represent the borders between the three other routers. When configuring the routers first I had go into privilege mode on the CLI tab. In order to do so I did (router > enable) command which put me in that mode then I went into configuration terminal mode using command (router #config t). Now that I was in config mode I gave each router its hostname, enabled password/secret and gave them each a banner. Then once I was finished with the first part of the basic configurations I went on and configured the interfaces of each router and its networks.
With router Boston it uses a 1941 router type and has 2 LAN networks connected to itself in its gigabit ethernet ports 0/0 and 0/1. With gigabit ethernet port 0/0 having an interface of 192.168.10.254/24 and gigabit ethernet port 0/1 having an interface of 192.168.20.254/24. Router Boston is connected to router New York over WAN connection using DCE crossover media on its serial port 0/0/0 which has an interface of 1.1.1.5/30 on the 1.1.1.4/30 network. Router New York is also a 1941 router also connected to routers border and Vegas using DCE crossover media connections. Unlike the rest of the routers, router New York is connected to all the routers on serial ports. Such as port 0/0/0 for the interface 1.1.1.1/30 connecting it to the border router across network 1.1.1.0/30. As well as serial port 0/1/0 which connects interface 1.1.1.6/30 across network 1.1.1.4/30 to serial port 0/0/0 on router Boston. Router New York also has serial port 0/0/1 on interface 1.1.1.10/30 connected to interface 1.1.1.9/30 on router Vegas serial port 0/0/0 across network 1.1.1.8/30. Router Vegas is a 1941 router with two LAN connection on its gigabit ethernet ports 0/0 and 0/1 and one WAN connection on its serial port 0/0/0. With the gigabit ethernet port 0/0 it has a interface of 192.168.30.254/24 and on the gigabit ethernet port 0/1 it has a interface of 192.168.40.254/24. In router border its serial port 0/0/0 interface 1.1.1.2/30 it is connected to router New York across network 1.1.1.0/30 and also has a look back port interface of 198.155.202.1/32.
In the topology all pings and connection worked and were successful when I did them and checked them.