Test DNS Error

Today I am Start VC System in My Office and I am Found that VC is Auto Disconnected After Some Time. But We are not found any Drops on Over RF link.

After a long time testing we are found that DNS server is going in Not Responding or Slow Responding.
How I test DNS Server -

I am Configure link on My Laptop and Start Internet Browsing.
Facebook and Mail.live.com is Slow Browsing but all other Websites Running Normally.
I am Start Ping with DNS Server.
Many Time, I am watch High Latency on the Link.
After All I am Replace My DNS IP with Open DNS IP.
Test Facebook and Mail.live.com and Now Its Running Normally.

 
Please Wait --- I am Writing Complete Method for Testing DNS Server ------ Please Visit again after 20 mints. 

Complete listing of the Instaaled drivers

Get Installed Driver Information with CMD

Open CMD and type a Command - 

"Driverquery"

And Hit Enter Key ...

DEEPAK KUMAR VERMA CALL 9214012330 MAIL - deepuverma@engineer.com