![]() ![]() Related: By default, a computer will use the default DNS server of the network it is connected to, which will be provided by the service provider or ISP. This was a major impetus behind the Domain Name Security Extensions (DNSSEC) security layer used to authenticate name servers for those providers supporting it. DNS was designed to be resilient but under stress, it will still slow.Security: DDoS attacks on DNS servers underscore the system's vulnerability – no website whose DNS servers have been overloaded will be able to conduct much business - but other security issues abound including cache poisoning (redirecting users from legitimate to fraudulent DNS servers). ![]() This is why visits to websites in remote countries sometimes take perceptibly longer for reasons that aren't (as many assume) to do with a slow web server on the other end of the request.Another problem is that DNS name servers can become congested due to heavy use at peak times or malicious DDoS attacks causing problems behind the scenes. The most obvious of these is simply the round-trip time between the client device and the DNS server itself, which will depend on geographical proximity as well as response times from any other DNS infrastructure involved in a query.Even meaty name servers will not cache every possible website domain and have to look that up recursively by sending a query to a remote server. ![]() This sounds like a straightforward process but there are a number of variables that affect performance.
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