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nslookup command

What Is a Content Delivery Network (CDN)?

A CDN (also known as content distribution network) is nothing but a group of servers (system of computers) spread across the globe. The main is to optimizing the flow of digital content (such as css, images, JavaScript, video) and speed up web application to end-users. CDN utilizes advanced software, DNS, storage and networking technologies for organizing your data.
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I already wrote about verifying your own or ISP recursive resolvers using dig command under Linux and UNIX. However, most windows users don't have dig command installed. You can use nslookup command as follows (open dos prompt by visiting Start > Run > type "cmd" > Enter:
nslookup -type=txt -timeout=30 porttest.dns-oarc.net
nslookup -type=txt -timeout=30 porttest.dns-oarc.net ns1.your-isp.com
nslookup -type=txt -timeout=30 porttest.dns-oarc.net NS-SERVER-IP

You must see the word GOOD otherwise your dns is open to attack.

Check DNS Cache Poisoning Under Windows Xp / Vista / Server Edition using nslookup command

Check DNS Cache Poisoning Under Windows Xp / Vista / Server Edition using nslookup command