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CCNA Certification All-In-One For Dummies by Silviu Angelescu

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Chapter 1: Introducing Computer Networks

Exam Objectives

Describing the purpose and functions of computer networks

Describing common network applications

Describing common networking devices

Describing the operation flow of computer networks and seeing how networking devices control the operation flow

Describing the impact of applications (Voice over IP and Video over IP) on a network

Describing the components required for network and Internet communications

Describing the topologies of computer networks

CCNA certification not only attests your knowledge about Cisco networking, but it also attests your knowledge about networking technologies in general. This is one of the reasons why CCNA certification is the gold-standard certification in the networking industry.

Purpose of Computer Networks

You link computers in a network for the same reason that people network. People networks are necessary to accomplish tasks that cannot be accomplished by a single individual. The same applies to computers. Computer networks were developed to aggregate the computing power of several individual computers into initially local networks, then campus networks, then metropolitan networks, then countrywide networks, and finally, global networks.

A computer network is a group of computer host devices that communicate with each other. To enable this communication, the computer host devices are connected using wired or wireless connections. The communication is controlled by network software running ...

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