By Jerry FitzGerald, Alan Dennis, Alexandra Durcikova

ISBN-10: 111808683X

ISBN-13: 9781118086834

The eleventh variation of FitzGerald and Dennis' company info Communications and Networking makes a speciality of extra accomplished updating, in addition to extra hands-on and utilized routines. the recent variation has extra in-depth insurance of routing; revisions and updates on instant; extra instances for team-based studying; and extra hands-on lab workouts. quite often, this article has extra information in lots of chapters, particular updates, and up to date illustrations.

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Example text

The developers of Web applications, for example, do not need to write software to perform error checking or routing, because those are performed by the data link and network layers. Developers can simply assume those functions are performed and just focus on the application layer. Likewise, it is simple to change the software at any level (or add new application protocols), as long as the interface between that layer and the ones around it remains unchanged. Second, it is important to note that for communication to be successful, each layer in one computer must be able to communicate with its matching layer in the other computer.

Quite literally anyone is welcome to join its mailing lists, attend its meetings, and comment on developing standards. 3 Common Standards There are many different standards used in networking today. Each standard usually covers one layer in a network. 5. At this point, these models are probably just a maze of strange names and acronyms to you, but by the end of the book, you will have a good understanding of each of these. 5 provides a brief road map for some of the important communication technologies we discuss in this book.

Each layer and each standard is different, but all must work together to send and receive messages. Either the sender and receiver of a message must use the same standards or, more likely, there are devices between the two that translate from one standard into another. Because different networks often use software and hardware designed for different standards, there is often a lot of translation between different standards. Layer 5. 323 (audio/video) SMTP, IMAP, POP (e-mail) 4. Transport layer TCP (Internet and LANs) SPX (Novell LANs) 3.

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Business Data Communications and Networking by Jerry FitzGerald, Alan Dennis, Alexandra Durcikova


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