Some applications are dependent on network functionality and they would not install if a network card is not present. As you will see in the next articles, some network parameters are changing frequently so we will need a static network card.
Microsoft Loopback Adapter is a dummy network card, no hardware is involved. It is used as a testing tool for a virtual network environment where network access is not available. Also, you must use the Loopback adapter if there are conflicts with a network adapter or with a network adapter driver. You can bind network clients, protocols, and other network configuration items to the Loopback adapter, and you can install the network adapter driver or network adapter later while retaining the network configuration information.
Then you will have a network card that will allow applications (such RDBMS) to be installed. After installation you need to set an IP address to it. A good IP address would be 10.10.10.10 and 255.255.255.0 as mask. General recommendation is something like 192.168.1.1, but I saw many DHCP servers where the gateway is 192.168.1.1 and this means that your internet connection will not work.
!! BE AWARE THAT SETTING A GATEWAY MAY SCREW YOUR INTERNET CONNECTION !!