Having a hard time pinging other servers on the opposite side.

[EverythingBagel]

Hello Good Morning, I am currently enrolled as a 1st yr college taking up I.T networking. and learning cisco. So to cut to the chase I am currently working on my project and having trouble pinging servers on the other side of the networks I have tried troubleshooting myself doing research on the internet reading books etc. But to no avail, I am still puzzled as to why it's not working. So I have decided to make a post here and ask for advice for the experience lads that are willing to help. Below is the file of the network packet tracer. Thanks and have a great day https://ufile.io/13yr5ozw

[EverythingBagel]

[Georg Pauwen]

Hello,

there were numerous problems with your network:

--> multiple OSPF processes on the routers

--> missing WAN networks under the OSPF process

--> serial links encapsulated with PPP (and CHAP authentication)

--> links between switches and left and right routers need to be trunks

Please find attached the revised file...