All of the rest can just have default routes. The only router that needs to know explicitly how to reach any of the 10.x.x.x routes is the central router at the top of your diagram. Now, to add a static route to your routers with Cisco Packet Tracer. So instead of having a route to 20/8 and 30/8 on the subnet routers, you could just put a route to 0.0.0.0/0 pointing to 192.168.1.2 on the first router, 192.168.2.2 on the second one, and 192.168.3.2 on the third. Then, type iPConfig (if needed)Example: iPConfig 192.168.10.2 255.255.255.0. IP Addressing Table Router: To assign an IP address in router0, click on router0. Step 3: Configure router with IP address and Subnet mask. In fact, you can eliminate the routes on the subnet routers, too, and just give them a default gateway to the central router. Example: iPConfig 192.168.10.2 255.255.255.0 192.168.10.1 Repeat the same procedure with other PCs to configure them thoroughly. The "default gateway" is really just a route to 0.0.0.0/0 which means "the rest of the IP address space that I don't have a more specific route for". This tells the PC "when I have a packet that must go to a destination that is not on my own network, send it to 10.0.0.1, and that device will know what to do with it". So the subnet router port in the first network would have the address 10.0.0.1 and the PC would have 10.0.0.2 and the default gateway would point to 10.0.0.1. The default gateway of each PC needs to be the same as the subnet router port IP in its network.
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