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The exhibit showing pings has wrong destinations.  Should be pinging 10.1.1.x not 10.1.2.x

Diagram shows Client on the 10.1.2.0/24 network.  but R2 fa 0/1 is configured for 10.1.1.1/24.  

This question is also a bad example of summarization.  R2 sees 10.1.1.0/24 as directly connected and connects to 10.1.2.0/24 using the summary router 10.0.0.0/8.  R1 performs the same.  

I am not sure what the problem is here but it is not caused by auto-summarization. Full network connectivity exists with the current configuration.

PC1> trace 10.1.2.10
trace to 10.1.2.10, 8 hops max, press Ctrl+C to stop
1  10.1.1.1  0.260 ms  0.107 ms  0.140 ms
2  192.168.1.1  0.365 ms  0.299 ms  0.376 ms
3  *10.1.2.10  0.427 ms (ICMP type:3, code:3, Destination port unreachable)

PC1>


R1#show ip route 10.0.0.0
Routing entry for 10.0.0.0/8, 4 known subnets
  Attached (2 connections)
  Variably subnetted with 3 masks
  Redistributing via eigrp 10
D        10.0.0.0/8 is a summary, 00:06:23, Null0
C        10.1.1.0/24 is directly connected, Ethernet0/1
L        10.1.1.1/32 is directly connected, Ethernet0/1
D        10.1.2.0/24 [90/307200] via 192.168.1.1, 00:05:29, Ethernet0/0
R1#

There was a typo in the diagram which has been corrected. Thank you!