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

By Silviu Angelescu

A whole training consultant for the entry-level networking CCNA certification. in case you are making plans to increase your occupation through taking the all-important Cisco qualified community affiliate (CCNA), this can be the examine advisor you wish! Seven minibooks hide all of the thoughts and subject matters on which you will be established, overlaying the newest model of the examination. each one a part of the examination is roofed completely in its personal part, so that you can simply locate the data you must learn. lots of evaluate questions assist you arrange, and the better half CD-ROM contains the hugely rated Dummies attempt Engine so that you can try out your growth with questions in accordance with examination content material.

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E-mail applications also work at Layer 6, the presentation layer. For example, e-mail applications use the Multipurpose Internet Mail Extensions (MIME) protocol to convert audio, video, picture, graphical, and even software application contents in e-mail messages into a format that can be displayed, rendered, or played on the receiving host. Whenever you send audio or video, your e-mail application also uses MIME to code the audio/video contents within the e-mail message in a format that is easily transferable over the network.

Host D Host E Host A Introducing Computer Networks Figure 1-2: Star topology. Book I Chapter 1 Host B Host C Host F Host B Host C Figure 1-4: Bus topology. info 11 Host D 12 Topologies of Computer Networks ✦ Mesh: Multiple hosts are connected point to point to each other in a mesh topology, as shown in Figure 1-5. These are multiple point-to-point connections that typically link every host in the network with every other host in the network. You find two types of mesh topologies: • Full-mesh topologies provide several connections between hosts in the network, thereby improving reliability.

However, this does not imply that the upper layers need to change as well. Thus, the network model as a whole can adapt to support new media with localized change at the physical layer. Here’s how encapsulation works: ✦ A computer host device needs to send some data across the network to a remote computer host.

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