communication b/w wfe and query during search

Very recently i was asked a question on a particular scenerio.
Scenerio : consider you have 1 wfe ,2 query servers, 1 index server and a clustered database server. The 2 query servers are NOT load balanced. So how will the wfe server communicate with the query server and an end user hits a search query.

After a long research the answer was when the end user puts some keywords for search the search.asmx is invoked. This search.asmx will send a request to both the query servers and which ever query server responds for the request the search.asmx( which is on the wfe) sends the keyword search request to that query server and the search result is got back.The query will look into the local index that it has and give back the result.