The public core of the open internet, namely its main protocols and infrastructure, which are a global public good, provides the essential functionality of the internet as a whole and underpins its normal operation. ENISA should support the security of the public core of the open internet and the stability of its functioning, including, but not limited to, key protocols (in particular DNS, BGP, and IPv6), the operation of the domain name system (such as the operation of all top-level domains), and the operation of the root zone.