Im sorry, this makes no sense. i think it is supposed to be an analogy, but i would need more info or background about the question
Answer:
The left button is used as the main clicking button that you use to select things and to double click. The right button is used to open contextual menus, which are pop-up menus that change depending where you click.
The answer is "<span>To allow a DHCP server to request a DNS server to update or create a record.</span>"
Hope this helped and have a nice day!!