Final answer:
In a network frame, the HTTP query string submitted via the GET method is located in the header of the HTTP request.
Step-by-step explanation:
The part of a network frame that contains the HTTP query string submitted by a client using the GET method is in the header of the HTTP request. Specifically, the query string is located in the request line of the HTTP header after the path of the resource being requested, typically starting with a question mark (?). The payload of the network frame contains the actual data being transmitted, the trailer contains additional information for certain types of transfer encodings, and the data-link layer is responsible for node-to-node validity and integrity on the same network.