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CCNA for Dummies by Ron Gilster

By Ron Gilster

What used to be that whizzing sound? It used to be you, passing the CCNA certification examination. After you've coated all of Cisco Systems' examination ambitions in CCNA For Dummies, such initiatives as following community protocols, routing, and protecting community defense can be new instruments so as to add on your ability set. First, anticipate to familiarize yourself with the language of the examination with the specialist suggestions of your qualified authors. Then, locate your manner round the workings of the OSI version and its layers: the information hyperlink, community, delivery, and top layers. Routers develop into potential as you perform instructions and algorithms. And while you're pleased with community protocols, you'll circulate directly to LAN and WAN switching. The book's CD-ROM is helping you verify your susceptible spots via a try out engine and numerous examination eventualities, and ten websites to spice up your learning also are integrated. bear in mind: It's only a try, and at this element, it's open ebook! Covers: examination 640-507

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7. Do not or has no effect. Look over Reasons why a layered model is used. 8. Packets. Check out Packaging the data. 9. Protocol data unit. See Packaging the data. 10. UTP or unshielded twisted−pair. Review Choosing the network cable. The OSI: A Model of Efficiency Remember The CCNA exam asks you to provide at least three reasons that the industry uses layered interconnection models. First, here are some basic definitions. A layered model is one that takes a task, such as data communications, and breaks it down into a series of tasks, activities, or components.

In fact, most of this book is dedicated to teaching you first the language of the CCNAs world, along with the tools of the trade. However, in this chapter, we want to provide you with an overview of the terminology and concepts that are fundamental to all of networking, including Cisco networks. Laying Out the Network Topology Remember Topology is the physical layout of the computer, other nodes and cabling of the network. For the exam, youre expected to know the most common types of network topologies.

This works on the same principle that each domicile on your street has a unique address assigned to it by the Postal Service. Its the MAC address that the Physical layer uses to move data between nodes of the network. A MAC address is made up of two parts: the manufacturers ID number and a unique serialized number assigned to the device by its manufacturer. The 48−bits (6 bytes) of the MAC address are divided evenly between these two numbers. The first three bytes of the MAC address contain a hexadecimal manufacturer code that has been assigned by the IEEE.

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