Can't ping from one network to another. Please help

[Pilder1]

Hello everyone,

I need some guidance on pinging from router 1 to router 2 and 3 and viceverse. I've been struggling pinging from PC Admin in Office 3 to CEO1 in Office 1, I have looked for all connections and looked for all possible missed commands and subnet masks, I have done everything in my knowledge, even though I can't reach connectivity from one network to another.

Attached please find the topology I've been working with, so you can take a look and correct me from my mistakes.

Thank you all.  

[Georg Pauwen]

What are the enable passwords for your routers ?

You need routing on your routers, either static or dynamic. The easiest would be to configure the below
on all three routers:

router eigrp 1
network 0.0.0.0
no auto-summary

Also, it looks like you have a duplicate IP address:

R3

interface Serial0/0/0
ip address 172.16.10.98 255.255.255.224

R2

interface Serial0/0/0
ip address 172.16.10.98 255.255.255.224

[Pilder1]

ACDC1973

beatles1960

Thank you.

[Georg Pauwen]

Hello,

there were numerous mistakes in your network configuration:

1. All IP addresses and default gateways of all PCs were wrong. I added DHCP pools on the routers, so the attached devices get the correct addresses.

2. The trunk between the switch and the router had a native Vlan of 100. This kept the trunk from transmitting any traffic. If you want to set the native Vlan to 100, you need a matching subinterface on the router. I set the trunk to the default (native Vlan 1).

3. I corrected the duplicate IP address between R3 and R2.

4. I removed all port security from the access ports

5. I assigned static IP addresses to both servers.

Attached the working file with end to end connectivity (saved in PT version 7.3.1).