Hi, I have a question regarding EIGRP Query Scoping:
Please see attached diagram for detail and question.
My rationale:the exercise mentioned that EIGRP is configured as default configuration. That means that EIGRP summarizes routes by default. Therefore, don't we have a case of EIGRP Scoping - Network summarization in this case? If so, I thought that since the router is summarizing routes, queries should stop one hop away from the point of summarization. So my answer to this question would be that EIGRP queries should not go beyound RouterB. I am wrong though.
I can only confirm what Rick has written: the document you have posted does not contain addressing information in the exhibit. What I see is only a topology of four routers but absolutely no addressing information is present in the exhibit.
I can give you only a general answer here: You are correct that if summarization is taking place then the query will be stopped one hop after the point of summarization. However, assuming that the automatic summarization is activated, if the entire network is addressed using only subnets of the major network 10.0.0.0/8, no summarization will actually take place and therefore, the scope of the query will not be limited.
While the term "Query Scoping" sounds very advanced and technical, it is actually nothing exceptional. Its logic stems from the fundamental fact that if a router asks about a network that is not present in the neighbor's EIGRP topology and routing table, the neighbor will immediately respond with a reply indicating an unreachable network.
I believe you have already seen this document but I suggest having a look at this URL - it contains a table of query/reply processing which is, in my opinion, quite illustrative: