You have a sharepoint server 2013 sp1 server farm. The server farm contains two web
servers named Server1 and Server2. Server1 and Server2 are configures as query servers.
You need to ensure that all search requests are processed by server2. You need to ensure
that all search requests are processed by Server2 only. What should you do from Central
Administration?

A.
Modify the Host Distribution Rules settings.

B.
Modify the Service Application Associoation settings.

C.
Create a new search service application.

D.
Modify the Search Application topology settings

Explanation:
A single SharePoint 2013 farm can provide multiple instances of search service applications. Each service
instance can support multiple component instances in a topology that can be designed for performance, for
resiliency, or to isolate information.
The default topology of a new search service application will have a single instance of each component, all
components on one application server, and all databases on one database server. The four components are
as follows.
Administration interface
Crawl component (the crawler)
Database set, broken into three databases: administration, crawl, and property
Index partition
This topology can be changed using the Modify Topology link located on the Farm-Wide Search Administration
page or from the Search Service Administration page. The SharePoint Search topology cannot be changed in
stand-alone installations.
http://allcomputers.us/windows_server/sharepoint-2013—managing-the-search-service-topology.aspx