TecMint published a tutorial about installing Debian 11 (Bullseye) server using net install.
How to Install Debian 11 (Bullseye) Server Using Net Install
In this guide, we will walk you through the installation of a Debian 11 (Bullseye) Minimal Server, using the netinstall CD ISO image.
How to Install Debian 11 (Bullseye) Server Using Net Install