Download 31 Days Before Your CCNA Exam: A day-by-day review guide for by Allan Johnson PDF

By Allan Johnson

I like this e-book! It encompasses a pullout 31 day calendar within the entrance, with a couple of themes consistent with day for research. contained in the e-book isn't a host of questions ( so do not anticipate this to be simply one other run of the mill perform exame booklet ), the writer presents an encapsulated overview on each one subject, through EXAMPLES of the way to do what was once simply reviewed. *It's a 31-day, simply readable, condensed completely, textbook! (The ideal significant other in your CCNA perform examination books)

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Read or Download 31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition) PDF

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Additional info for 31 Days Before Your CCNA Exam: A day-by-day review guide for the CCNA 640-802 exam (2nd Edition)

Example text

Government required the use of OSI products in the 1980s and 1990s, the Defense Advanced Research Projects Agency (DARPA) under the Department of Defense—and with the help of researchers at various universities—had designed the competing TCP/IP model. For various reasons, including the popularity of TCP/IP, by 1983 the ARPANET had chosen TCP/IP as its principle protocol suit. S. government agencies were required to switch over from OSI protocols to TCP/IP. 14 31 Days Before Your CCNA Exam Today, we use the OSI model principally as a tool for explaining networking concepts.

Key Points As a new student to networking, one of the very first topics you probably learned was the layers of the OSI and TCP/IP models. Now that you have completed your studies and are reviewing for the CCNA exam, you more than likely can see the benefit of using these models. Each helps our understanding of networks in its own way. Today we review the OSI and TCP/IP models, as well as the applications and protocols that are commonly used in networks. The OSI and TCP/IP Models To understand how communication occurs across the network, we use layered models as a framework for representing and explaining networking concepts and technologies.

HTTP response sent from the web server with a code in the header—usually either 200 (request succeeded and information is returned in response) or 404 (page not found). The HTTP request and the HTTP response are encapsulated in headers. The content of headers allows the application layers on each end device to communicate. Regardless of the application layer protocol (HTTP, FTP, DNS, and so on), all use the same general process for communicating between application layers on the end devices. The TCP/IP Transport Layer The transport layer, through TCP, provides a mechanism to guarantee delivery of data across the network.

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