In order to fast set up OSI requires agreement bw threeparties users service

In order to fast set up osi requires agreement bw

This preview shows page 27 - 30 out of 40 pages.

In order to fast set up OSI requires agreement b/w three­parties: users & service provider. Complex.
Image of page 27
9/25/2016 Topic Print View (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334573&s… 28/40 This model is not adapted at all to telecommunication applications on computer. Reference ; and­disadvantages­of­osi­model/ RE: Question 1 Eric Frazier 9/4/2016 12:18:46 PM I know the OSI model is used to show how the network stack works but it is very complicated. They ask us to learn 7 layers and that some layers can do multiple things. I have always found this to be very confusing and difficult to understand. The TCP/IP model always made more sense to me. The model flows very nicely from on layer to the other. The layers do all the things in the TCP/IP model that can be done in the OSI model. However, in my opinion, the TCP/IP model makes more sense to in how it groups it's layers. The application layer groups all the "software" components into one layer. This makes it easier to understand from my perspective. RE: Question 1 Zachariah Westerfield 9/3/2016 10:41:06 AM 1. Many LANs are powerful (high speed) and has low error rates, many applications do not need the data integrity provided by OSI. 2. Many LAN applications need very fast setup with each other but the connection mode transfer in OSI requires an agreement between 3 parties, users and the service provider, hence it is slow. 3. The OSI model is too complex. The gap between the concrete use (implementation) and the model is sometimes significant. Indeed, few programs can use or wrongly use the 7 layers of the model: the session and presentation layers are hardly used and on contrary the data link and network layers are often split into several sub­layers, since they are pretty complex The OSI model is in fact too complex to be effectively and properly implemented. The committee that wrote the standard even had to leave aside some technical points, like security and coding, so much it was delicate to preserve a well defined role to each layer completed with these extra technical points. This model is also redundant (the flow control and the error control appear in most layers). At the implementation level, TCP/IP is much more optimized and effective. 4. OSI model is not adapted at all to telecommunication applications on computer. Some choices are in disagreement with the way computers and software communicate. The standard actually uses "system interruptions" to report events, and with high level programming languages, that is not very realizable.
Image of page 28
9/25/2016 Topic Print View (NEXT(9aa8e367917140bc999f3323f7766024))/Main/CourseMode/Topic/TopicPrintView.ed?topicID=7000009334573&s… 29/40 5. Due to the complexity of the model, the first implementations were pretty heavy and slow. Conversely, the first implementation of TCP/IP in the Unix system of the Berkeley University (BSD) was free and relatively effective.
Image of page 29
Image of page 30

You've reached the end of your free preview.

Want to read all 40 pages?

  • Summer '12
  • D
  • Local area network, WANs

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes