Networkscanningisadisciplineofnetworksecuritythatidentifiesactivehostsonnetworksanddeterminingwhetherthereareanyvulnerabilitiesthatcouldbeexploited.NessusandNmapareamongthetoptoolsthatenableyoutoscanyournetworkforvulnerabilitiesandopenports,whichcanbeusedasbackdoorsintoanetwork.