Nick Wittenberg is an adjunct professor at Seneca College of Applied Arts and Technology, in Toronto, Canada. Nick has been training on networks and communications since 1986. Nick is owner/operator of LRG Networks, a contract training company that produces and licenses networking courseware. He holds multiple certifications such as MCT, MCSE, A+, and Network+. Nick Welcomes any suggestions for this book and you can email him at email@example.com.Wittenberg, Nicholas is the author of 'Understanding Voice over IP Technology', published 2009 under ISBN 9781435427273 and ISBN 1435427270.