>> Because I study RIP is working on Application Layer.
some basic courses try ton enforce the point of view that RIP being over UDP is an application at the encapsulation level, in TCP/IP stack Level 4 and above have not their own headers as you could see on the OSI protocol suite
However, RIP job is done at OSI layer 3 being a routing protocol
the debug output simply reflects the reality
2) being a distance vector the next-hop of the local node will be = RIP source address unless the other device would like to advertise a different one (but in same subnet)
routing by rumors is how distance vector routing protocols work
1) The debug ip rip output does not show the port number. It is expected that the RIP always runs on port 520 so having this port displayed in the output would be, in most cases, useless. If you want to see the port number try adding the command debug ip udp which displays all UDP segments processed by your router
2) The recommended next-hop IP address field in RIPv2 messages is an optional field (i.e. it does not have to be filled with actual address). For most applications, it is unused. However, to get a glimpse of what is its intended usage, have a look at the RFC 2453, Appendix A - this is the RFC that describes the entire operation of the RIPv2. The link is
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