1. Nxnsattack: Recursive DNS inefficiencies and vulnerabilities;Afek,2020
2. Akkerhuis, J., Chapin, L., Fältström, P., Kowack, P., Liman, L., Manning, B., 2009. Scaling the Root. In: Report on the Impact on the DNS Root System of Increasing the Size and Volatility of the Root Zone (TNO). Delft, Netherlands.
3. Anon, ., 2007. RFC5001 for DNS Name Server Identifier NSID Option, https://www.rfc-editor.org/rfc/rfc5001.
4. Anon, ., 2013. RFC6891 for Extension Mechanisms for DNS https://www.rfc-editor.org/rfc/rfc6891.
5. The 2015 root server ddos attack;Anon,2015