Tails is a live system that aims to preserve your privacy and anonymity. It helps you to use the Internet anonymously and circumvent censorship almost anywhere you go and on any computer but leaving no trace unless you ask it to explicitly. It is Free Software and based on Debian GNU/Linux
Read more here – https://tails.boum.org/index.en.html
A free Windows utility from NirSoft allows you to capture and display DNS traffic on your system. The utility called DNSQuerySniffer is capable of displaying the Host Name, Port Number, Query ID, Request Type (A, AAAA, NS, MX, and so on), Request Time, Response Time, Duration, Response Code, Number of records, and the content of the returned DNS records.