LIST OF ABBREVIATIONS CCDCOE – Cooperative Cyber Defence Centre of Excellence CECSP – Central European Cyber Security Platform CERT – Computer Emergency Response Team CII – Critical Information Infrastructure CSIRT – Computer Security Incident Response Team CTO – Czech Telecommunication Office DNSSEC – Domain Name System Security Extensions ENISA – European Union Agency for Network and Information Security EU – European Union ICT – Information and Communication Technologies IIS – Important Information Systems IPv4 – Internet Protocol version 4 IPv6 – Internet Protocol version 6 ISP – internet service provider www.GovCERT.CZ 31

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