Welcome! Cisco Systems, Inc., the world’s leading supplier of net-working solutions for the Internet, has prepared this guideto make networking easier to understand and moreapproachable for your small or medium-sized business. Ifyou’re new to networking, it’s an ideal introduction, start-ing with the most basic of components and helping youpinpoint the best technologies and design for your net-work. And if you already know your networking ABCs,look to this guide for straightforward explanations of keyterms and concepts to keep building your knowledge base. Cisco solutions are at the foundation of thousands of busi-ness networks worldwide, from large multinational corporations to single locations with as few as two users.Today, nearly all Internet traffic runs on Cisco solutions.So when you install Cisco, you’re choosing the networkingequipment that’s proven suitable for the world’s largestand fastest growing network.