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

By Silviu Angelescu

An entire education advisor for the entry-level networking CCNA certification. if you are making plans to increase your occupation by way of taking the all-important Cisco qualified community affiliate (CCNA), this is often the learn advisor you wish! Seven minibooks conceal all of the recommendations and subject matters on which you will be proven, protecting the newest model of the examination. every one a part of the examination is roofed completely in its personal part, so that you can quite simply locate the data you need to research. lots of evaluate questions assist you arrange, and the better half CD-ROM contains the hugely rated Dummies attempt Engine so that you can attempt your development with questions in accordance with examination content material.

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Web browser: Browsers also use the MIME protocol to convert nonHTML contents in Web pages. Layer 5: Session The session layer maintains a logical communication channel between a network application running on the sending host and a network application running on the receiving host. Sometimes the session layer also provides authentication services when sessions are established. The following TCP/IP protocols are found at Layer 5: ✦ Telnet: A protocol used to open login sessions on a computer host.

It also insulates the upper layers from network implementation details below, by providing a generic data transfer protocol to upper layers, no matter how the network is implemented underneath. info Layer 4: Transport 29 Connectionless transport Data can be sent between two hosts without establishing a logical connection between sending and receiving hosts. Connectionless transport protocols do not guarantee reliable delivery of data segments. However, they are a bit faster than connection-oriented transport protocols, because they do not need to spend time to establish and maintain connections.

Read the following sections to get acquainted with the TCP/IP protocol stack. TCP/IP implements almost the same networking layers as the OSI reference model. However, some TCP/IP protocols work at more than one level. Layer 7: Application The application layer represents the various network applications such as e-mail reader and Web browser. It is important to distinguish between Layer 7 protocols and Layer 7 software applications. For example, you use Web-browsing software to view Web pages that are transferred to your computer using the Hypertext Transfer Protocol (HTTP).

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