Since the introduction of the Domain Name System (DNS) in 1987 (RFC1034 / RFC1035), more than 30 years have passed. The internet became as crucial as food and power supply. Back in 1987, the inventors and engineers of DNS probably never thought that the internet would become such a big and crucial thing for the 21th century. As a result, DNS comes with a handful of weaknesses that can be exploited by threat actors for malicious purposes.
Article Link: http://www.govcert.ch/blog/security-of-the-swiss-domain-landscape-cctld-ch/