DNS or Domain Name System is a protocol which, in simple terms, is responsible for the translation of web addresses into IP addresses and hence enables web browsing over the World Wide Web as we know it. It is an integral part of the working of the Internet and how web pages and web addresses are retrieved. It is a collective segregation of all the resources which store the IP addresses of the DNS name servers which in turn have the control over every single registered domain name. When a person buys a domain, the domain registrar essentially assigns a minimum of two name server IP addresses to the domain and these name servers ensure that the correct web host is then referenced to retrieve the content.
Despite being an important component in the network infrastructure, DNS security is an aspect quite often overlooked. It is always strongly recommended that your infrastructure should comply with DNS security guidelines, failing which your servers can be under a host of attacks. The most common attacks on DNS servers include cache poisoning, phone call redirects, man in the middle, email rerouting, denial of service and others.
The primary concerns for the vulnerability of DNS date back to the initial stages of its development. It was designed when the internet used to be a much closed community used mostly by government organizations and universities. It was the default assumption that the requests coming then were genuine and legitimate.
It is integral to discuss some of the above threats in order to develop a greater understanding about them.
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