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To create its highly regarded networking information products, 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. Instead of using just one or two networking professionals to address the multitude of topics addressed on Cisco's certification exams, Certification Zone finds experts in each topic who have hands-on field experience with the technologies they cover for our site.

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

Howard C. Berkowitz

Howard C. Berkowitz

Certification Zone Study Guides by Howard C. Berkowitz:

Access Lists




Bridging and Switching

Ethernet Basics

Gigabit Ethernet

High Availability

IP Addressing

IPv4 & IPv6

New Generation of Cisco Switching





Routing Principles

Scalable Routing - Link State


VPN Study


Howard C. Berkowitz is Chief Technology Officer of Gett Communications, where he says he plays doctor, both directly ministering to networks and also playing a physician on advanced systems for clinical medicine. Not limiting himself to the challenges of computers in medicine, he also is using medical and biological paradigms to deal with the complexity of modern networks.

His interests include high-availability and scalability both in the Internet and life-critical medical systems. Current IETF work includes drafts on BGP convergence time, multihoming, and analyzing growth in the global routing table. He is the author or coauthor of several RFCs in IP addressing and international standards in performance testing. In the Internet Research Task Force, he has worked on requirements for the successor to BGP and works with international operations forums such as NANOG, ARIN, and RIPE. Current medical computing work includes intensive care patient monitoring, expert systems for prescribing and reducing human error in medicine, remote viewing of medical imagery, mass casualty incident support and chemical-biological defense, all under the stringent privacy rules of HIPAA and other regulations.

In the past, he was Senior Advisor, IP Routing, in Nortel's corporate R& D laboratory. His research interests include the design of next-generation carrier routers, unicast routing protocols (BGP, OSPF, ISIS) and the overall problems of Internet routing system scalability. He was the internal co-manager for Nortel contributions to the Routing Area of the IETF and to the IETF and international forums such as NANOG, RIPE and the Internet Society.

He became a Certified Cisco Systems Instructor in 1993, doing both network design and education before the CCIE even existed. His certification is inactive because he no longer works for a Training Partner. He contributed to Cisco courses including Cisco Internetwork Design and Advanced Router Configuration as well as to Cisco seminars in switching, virtual private networks, and data-voice-video integration, and internal Cisco courses in AVVID design. He has also taught Cisco/Stratacom switching, and developed his own seminars in Internet routing with BGP and advanced interior routing and switching.

His operational experience includes consulting on design for a variety of advanced healthcare networks; broadband provider networks; US government networks including the Library of Congress, National Communications System and Y2K information network; and large AT& T, Lucent, and advising MCI on an assortment of worldwide customer networks. He first touched a computer in 1966, but strongly denies that it was a steam-powered Babbage machine.

He was the first technical staff member at the Corporation for Open Systems, and directly participated in OSI standardization. He also has contributed to government, national, and international standards in such forums as ANSI, the Federal Telecommunications Standards Committee, IETF, ISO, and CCITT/ITU.

Howard's latest book is Building Service Provider Networks. His previous books include the WAN Survival Guide, which deals with making choices about which service level agreements are needed and how to select technologies to meet them. His other books are Designing Addressing Architectures for Routing and Switching, and Designing Routing and Switching Architectures for Enterprise Networks. In addition, he has written dozens of articles for the industry press and spoken at numerous trade shows and user groups. He is the author of the networking chapter in Harvey Deitel's widely used textbook on operating systems.

Interview with the Author - Q&A; regarding IPv4 & IPv6

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