Cisco: The Complete Reference is a lofty title for a book, and one that you could take
in a multitude of different directions. Some think that a book with this title should be
the “end all and be all” of Cisco books, including every possible Cisco technology and
the most obscure details of those technologies. Unfortunately, that book would
consist of over 50,000 pages, and it would be obsolete by the time you got it. (Cisco
has been trying for years to write that book; it’s called the Cisco web site, and it’s still
not complete.)
Rather, the tactic I chose for this book was to cover the most commonly used
technologies in most networks, with detailed explanations and a focus on practical
understanding and use. In most cases, although obscure details are somewhat
interesting, they really don’t help much unless you are a contestant on “Cisco
Jeopardy.” Therefore, I wrote a book that I feel people have the most need for: a
book designed to explain Cisco technology to the average network administrator or
junior network engineer who may need to understand and configure Cisco devices.
The goal of this book is not to help you pass tests (although it may do that) and not to
be the final word on any subject. Rather, the goal is to give you a complete
understanding of Cisco technologies commonly used in mainstream networks, so that
you can configure, design, and troubleshoot on a wide variety of networks using
Cisco products.
The book starts out innocently enough, beginning with Part I: Networking Basics, to
give you a refresher course on LAN and WAN protocols and general-purpose
protocol suites. In many cases, I also provide links to web sites to help you locate
additional reading materials. I suggest that you examine Part I in detail, especially
Chapter 6 on advanced IP, even if you feel you already know the subjects covered.
Without a solid understanding of the fundamentals, the advanced concepts are much
harder to grasp.
Part II, Cisco Technology Overview, provides an overview of Cisco networking
technologies, including references to most of the currently available Cisco networking
products. In this section, I provide reference charts with product capabilities and port
densities to help you quickly find the Cisco product you need to support your
requirements, which I hope will save you from hours of looking up datasheets on
Cisco’s web site. Part II culminates with a look at common IOS commands for both
standard IOS and CatOS devices.
Part III, Cisco LAN Switching, covers Cisco LAN-switching technologies. Layers 2
through 4 are covered, including VLAN configuration, STP, MLS, queuing
techniques, and SLB switching. Like all chapters throughout the rest of the book,
these chapters focus first on understanding the basic technology, and second on
understanding that technology as it applies to Cisco devices.
Part IV, Cisco Routing, covers routing on Cisco devices. It begins with a chapter
explaining the benefits and operation of static routing, and progresses through more
and more complex routing scenarios before ending with a chapter on securing Cisco
routers with access lists. All major interior routing protocols are covered, including
RIP, EIGRP, and OSPF.
The appendix contains a complete index of all 540 commands covered in the book,
complete with syntax, descriptions, mode of operation, and page numbers. This
appendix is designed to be your quick reference to IOS commands on nearly any
Cisco device.
Finally, many enhanced diagrams and errata can be found on my personal web site,
at http://www.alfageek.com.
Thanks again, and enjoy!

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