User:Yuan/drawbacks of DNS

Disadvantages of DNS There is a disadvantage of updating. When you update a DNS record, the caches are not updated immediately. So, some of the users in different SPIs will get the new DNS record, but some are not.

There are some security issues. Some domain names may be used to achieve spoofing effects. For example, there are some fake on-line shopping website, their domain name is very similar to the real one. And the other issue is DNS cache poisoning. Poisoning attacks on a single DNS server can affect the users serviced directly by the compromised server or indirectly by its downstream server(s) if applicable.

There are 13 root-servers.net in the world, 10 of them are located in the USA. And Verisign,Inc. manage two. Then Monopolization and Abusing of DNS will happen.