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Upgrading and Securing External Domain Space in the City of Niš Administration Infrastructure 2016 http://ezaposleni.singidunum.ac.rs/rest/sciNaucniRezultati/oai/record/1/4813 http://portal.sinteza.singidunum.ac.rs/Media/files/2016/148-153.pdf Đ. Antić M. Veinović Being a key Internet infrastructure component, DNS (Domain Name System) is vital for any organization that requires external visibility and availability of its services. Public administration is especially sensitive, due to the nature of services offered to citizens. This paper describes the strategy, implemented in administration of The City of Niš, for making external domain space more robust and resilient, as well as securing it with DNSSEC (DNS Security Extensions). conferenceObject 148 153 10.15308/Sinteza-2016-148-153 Proceedings