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We have explained the DNS registration process and how a browser will use the DNS entries to load a webpage.
Some issues are common to the DNS resolution that affects the web browsing process:
1. What happens if both DNS servers are down?
Typically, DNS servers will be located in one common area. A power outage or a network outage will cause both DNS servers to go down. When this happens. No one can get to your website, because the browsers can not resolve your domain to an IP address! They would NOT know how to get to your webserver! So when both DNS servers go down, your website is also affected.
2. What happens if DNS servers are ‘slow’?
A DNS server can be deemed slow if the query it returns takes a longer time than usual. This happens if the DNS is being attacked by hackers. They typically send large amounts of ‘query’ packets and overload the system. Or they do a denial-of-service attack against the server or the network housing the DNS service.
When this happens, your site’s visitors could feel that your website is slow also. And since web visitors typically do not wait for more than 18 seconds for a website to be fully loaded, you may lose clients.
3. What happens when DNS cache is polluted?
An improperly configured DNS server may be ‘polluted’ with false data. When this happens, a hacker will cause a wrong IP address to be inserted in a dns server. So when a user wants to visit a site called www.mydomain.ph, the dns server will forward another ip address instead of the TRUE ip address.
When this happens, the client browser is tricked into visiting another site. This false website can cause unsuspecting visitors to reveal their authentication details to the hackers!
You can use http://www.intodns.com to check for DNS and issues.