Failed Test connectivity to the Cisco.com server (Packet Tracer) help!

[Esme]

I'm a beginner and i'm doing a practice of "Build simple networks with various network devices"

the first pics is the requirement: 

requirements

I tried a lot and still failed in running the test cmd :

and this is my working graph in Cisco Packet Tracer :

When I try to test the connection between PC0 and PC1, I can't.

I checked all my topology and I don't found the problem.

I attached and imagen and my .pkt project

I think I need help.

Sorry for my broken English:(

Thank you for all, I will appreciate !!!

[Martin L]

Ping is OK from PC0 and PC1 but not to PC 2 via routers as they need a route to other networks. Router knows about its own directly connected networks; so no routeing  needed here but not about remote networks. Add static routes or protocol like RIP to route between remote networks.

Note that 1st ping almost always fails due to ARP process (L2 to L3 mapping). Before you can ping or open a web site, ARP needs to know how to reach destination; ARP will do its thing during 1st ping; ARP request is sent and ARP waites for reply.  then ARP info is cache locally for 5 minutes. Now, pings are OK. 

Regards, ML
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