Welcome to the next lesson in the CCNA Lessons Tutorial and Study Guide series.

The CCNA exam tests your knowledge of network types, uses, topologies and architectures, the network equipment used to build them, and the knowledge of how to build, configure and maintain internetworks.  You should be able to explain what each type of equipment will do and how it will improve the network.  You will need to know the benefits and drawbacks of each network type, the kinds of communications used in networks, the problems networks experience as they grow, how networks may be extended. Most importantly, you must understand how and when to segment networks into switched and routed domains to improve network performance using switching, VLANs and routing.   The process of understanding networking begins with understanding what networks are, how they are structured and how they work.

This tutorial begins the process by defining what a network is and explaining the common structures used by most networks, called “topologies”.  You will need to know the strengths and weaknesses of each of these network topologies to succeed with the CCNA exam.

Let’s move on to the definition of a network.

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