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To create its highly regarded networking information products, Certification Zone relies on the highest editorial standards. Other companies often use inexperienced or uncertified networking professionals to save money and cut corners. Certification Zone has always relied on a skilled group of world-class experts, who are certified and experienced, to write and develop our Cisco certification preparation products.

Technical Director Howard C. Berkowitz
Annlee Hines
Barry Meinster
Chris Ackerman
Chuck Larrieu
Dale Holmes
Damarcus Richards
Dan Farkas
David Wolsefer
Dennis Laganiere
Don Dettmore
Galina Pildush
Jason Sinclair
John Neiberger
Katherine Tallis
Kevin Downes
Keyur Shah
Leigh Anne Chisholm
Marc R. Menninger
Marianne Lepp
Mark Poplar
Mike Sweeney
Peter A. Van Oene
Priscilla Oppenheimer
Richard Gosney
Rita Puzmanova
Rodgers Moore
Ronald Trunk
Scott Morris

David Wolsefer

Certification Zone Study Guides by David Wolsefer:

Bridging

Frame Relay

ISDN

ISDN and DDR

Multicast

Security

David Wolsefer is the East Coast Senior Networking Engineer for Totality, a leading Managed Services Provider (MSP) headquartered in San Francisco. David is a Cisco Certified Internetworking Expert (CCIE) #5858 in Routing and Switching and is currently scheduling a lab date to attempt a second CCIE in the Communications and Services track. David is also a Microsoft Certified Systems Engineer (MCSE). His areas of expertise include LAN/WAN infrastructure, network security, and IDC/ASP data center design and implementation. David holds a bachelor's degree from the University of Florida and has completed extensive post-graduate work in Applied Mathematics.

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