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The OSI Model Demystified

Info

  • Level: Beginner
  • Presenter: Eli the Computer Guy
  • Date Created: July 9, 2010
  • Length of Class: 18 Minutes

Tracks

Prerequisites

Purpose of Class

  • This class explains the OSI Model for technicians

Topics Covered

  • The OSI Model

Class Notes

  1. Layer 7 – Application Layer – The layer users interact with
  2. Layer 6 – Presentation Layer – Generally the layer the Operating System is on
  3. Layer 5 – Session Layer – The layer that controls the communication session between two computers
  4. Layer 4 – Transport Layer – The layer that controls Windowing and other tasks related to communication
  5. Layer 3 – Network Layer – The layer that Routers and IP addresses operate at
  6. Layer 2 – Data Link Layer – The layer that Switches, MAC Addresses and ARP reside at
  7. Layer 1 – Physical Layer – The layer that cabling resides on

Resources



Eli the Computer Guy (437 Posts)

Eli the Computer Guy has 16 years experience in technology being the guy to fix "it". From the Army, to building out new satellite offices for the enterprise, to running his own shop with 9 full time employees Eli has real world experience with almost all systems that technicians will be working with. Eli has 1600 hours of formal technical beyond his Bachelors Degree in Criminal Justice on technologies ranging from Avaya PBX/ Audix to Microsoft, Red Hat Linux, MySQL, Cisco and much more.


  • Vic

    Eli,

    Thank you so much for your work in making these videos. I can’t tell you how much I have benefited from viewing them. I am a recent graduate and I feel as though I am learning this stuff for the first time. Networking was a huge gap in terms of my education.

    I have a few questions however. First, I’m a little confused about what you are actually referring to when you say “router”. Are you using the term interchangeably with a modem? Is there a difference between what you are referring to and a wireless router? What layer would wireless routers and modems regardless of if its DSL, Cable, or Fios etc. be on? Lastly, hasn’t the OSI model been replaced with the TCP/IP model?

  • Jose

    Eli,
    Thanks this was a perfect explication about OSI model .

  • Murugavel Mahadevan

    Hi Eli,

    I used to hate OSI model when I studied. Now I have understood properly about the OSI model, and start to listening your all network related classes. It is wonderful job, Thank you very much Eli.
    Thanks

  • ashish wali

    u are just absolutely phenomenal…..u teach brilliantly……god bless u…

  • ashish wali

    one day u are going to get really big…..thats for sure…

  • Okoro Ikedich

    you are a Genious for sure, God bless your effort

  • Edmond

    Al last….After so maney years….I was able to get the idea of what OSI is. Thank you Eli. God bless and plaese teach us more.

  • Luis Hernandez

    You are the man…… I have taken several classes and I have never understood the OSI Model. You have made the FOG go away. THANK YOU

  • Luigi

    Can i ask you one qn….Why are u doing these videos for free? There must be a secret i would like you to share with us.

  • Ricardo O’Brien

    I like the laymen terms. It’s helps me take all the big words used from text book (lol) and put to practical use. If you need one of those flunky interns let me know I would not mind working for the great Eli. How is that for an ego booster? Seriously let me know, later.

  • John Thomas

    Eli Rocks!!!

  • Jeff

    You are a great teacher! The way you get to the core principles is amazing. All instructors should have your demeanor. As Luiz said; you clear away the fog. Thank you so much for your time and effort. You really are a Godsend!!!
    Thanks Again

  • Rob

    Hi Eli,

    I work as a Area Sales Manager in the UK selling IP CCTV.

    Your basic network and TCP/IP courses courses are fantastic. I will definatly be refering many of my analogue CCTV customers to your website.

    Please can I have permision top use your videos within some of my powerpoint presentations? Is there anyway to get hold of a few as AVI files?

  • Marcello

    Thanks for your work. The videos are great. I`m preparing myself for an exame to become an IT-Technician in Germany. Your Videos are much better than the most of our teachers in our school.
    My exame is on wednesday but I´m feeling well prepared after watching your videos. Big thanks from Germany !!!

  • inder

    that is very gud explaination of the OSI.

  • Simon

    Excellent thank you so much for your tutorial very well explained

  • Tavo

    Thank you , you explain better than my school teachers thank you for your time than you spend for us the young IT

  • Brandon

    Absolutly love watching your videos, at first was using your youtube account, but decided to start using your website….. Bachelors in Networking (Penn State)



















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