For point to point connections u need to have the ip address in the same network.Even if you connect them with the dte -dce cable it will not of use as the router will not allow you to assign the ip address from the same subnet on two interfaces.
You are quite right about the behavior of Ethernet interfaces. But if you try it you will find that the behavior of serial interfaces is different and that you can configure two serial interfaces into the same subnet. I am not sure why this behaves in this way different from Ethernet but when I tested it I found that it did work.
Connecting two serial interfaces back to back on the same router should not do any harm to the router. I am not clear how much they will learn from doing this, but I do not see that it would do any damage to the router.
Thank you for the compliment. There are many things like this behavior on serial interfaces that is not obvious until you actually try it on real routers. I am glad to share what I have learned from experience. The forum is a very good place to learn about Cisco equipment and I encourage you to continue to participate in the forum, and also to get as much hands on experience as you can.
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