Using the network diagram below and the output from the show commands on the routers, identify and resolve why a host on the 192.168.20.0/24 subnet cannot reach a host with IP address 172.16.0.100. 
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Here are some errors I have seen from the o/p commands
R1: -> run EIGRP on the 192.168.20.0 network (NOT 192.168.28.0, as shown in the output), add the network to EIGRP
R3: -> EIGRP AS should be 123 NOT 23, Means R3 will not form neighborship with any of the
routers
-> Change the Metric K values as well on R3, else neighborship wont come up.
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1.Wrong network advertised under eigrp 123 on R1, should be 192.168.20.0 instead of 192.168.28.0
2. gateway of last resort unnecessary on R1, else should be via fa0/0
3. Wrong eigrp AS on R3, 23 instead of 123
4. Eigrp metric weight mismatch on R3, K5 should be set to 0
5. Passive interface command for fa0/1 should be removed.
6. My account details are….. GTB 00……. to be continued.
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apart from above answer eigrp is only advertising /32. it must have 172.16.0.64/26 under eigrp.
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Actually, even though the “show ip protocols” is showing 172.16.0.65/32, it is actually advertising 172.16.0.64/26. The reason it is showing that way is because of how the network statement was written: network 172.16.0.65 0.0.0.0 as opposed to network 172.16.0.64 0.0.0.63.
The “network” statement in EIGRP (and OSPF) actually tells the router which interface should run that routing protocol and not necessarily what network should be advertised.
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