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OSI Model

Discussion in 'Network+' started by Rob1234, Jan 13, 2008.

  1. Rob1234

    Rob1234 Megabyte Poster

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    I am currently reading the Groth Network+ book and I have got up to the OSI model and it says that the Network+ exam does not cover the upper layers (Session, presentation and application), I am surprised at this can anyone confirm if this is correct?
     
    Certifications: A few.
  2. dmarsh

    dmarsh Terabyte Poster

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    It does and it doesn't, most network engineers don't really get into the upper levels, its more OS and Application stuff for software developers. The exam does cover these layers because it covers basic application protocols and their use HTTP, FTP, SNMP etc. Most real world solutions rely on several protocols, applications and pieces of hardware to do something useful that generally maps to all the layers of the model. The N+ covers alot of tunneling and security protocols some of which probably map partly to the session layer.

    So the upper levels are barely covered but thats because they don't really mean much to the average Network engineer who typically starts at the botton with the physical devices. Sys admins care about the application layer but only really in an expert user sense normally. Typically only hackers and software developers are gonna care much about the details of these layers. Basic application protocol knowledge is probably useful for setting up firewalls to pass the traffic.
     
    Certifications: CITP, BSc, HND, SCJP, SCJD, SCWCD, SCBCD, SCEA, N+, Sec+, Proj+, Server+, Linux+, MCTS, MCPD, MCSA, MCITP, CCDH
  3. tripwire45
    Honorary Member

    tripwire45 Zettabyte Poster

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    Well...doesn't cover them *in detail*. You are still responsible for knowing the basic information such as where these layers occur in the model, what protocols are associated with each layer, and so on.
     
    Certifications: A+ and Network+
  4. dmarsh

    dmarsh Terabyte Poster

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    I'd say the Security+ does that more, the Network+ does not tell you the details of how applications communicate, what they put in their headers, when they open connections, how the session is established and torn down etc. Just knowing HTTP is used for browsers and sits in the application layer typically listens on TCP port 80 really tells you very little. It does not allow you to appreciate Webservices,SOAP,REST,the various payloads, mime types, how the browser works, how the web server works etc.

    The application layer is by definition defined and created by application developers, just some of these apps become standards. As such its constantly changing. The payloads change all the time. Also new app protocols are created like Bittorrent or the Windows Live Messenger protocol etc.
     
    Certifications: CITP, BSc, HND, SCJP, SCJD, SCWCD, SCBCD, SCEA, N+, Sec+, Proj+, Server+, Linux+, MCTS, MCPD, MCSA, MCITP, CCDH
  5. BrotherBill

    BrotherBill Byte Poster

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    2005 Network+ Objectives
    Domain 2.2: Identify the seven layers of the OSI (Open Systems Interconnect) model and their functions.

    Domain 2.12 covers the protocols mentioned by dmarsh and several others are mentioned elsewhere. If it's in the objectives, it may well be on the exam. And chances are you'll need it elsewhere in your career. I'd suggest you get familiar with them.
     
  6. MrNerdy

    MrNerdy Megabyte Poster

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    From the bottom up:
    Physical - Data Link - Network - Transport - Session - Presentation - Application

    Please - Do - Not - Try - Shagging - Paula - Abdul

    Well it worked for me!:rolleyes:
     
    Certifications: ECDL, CiscoIT1 & A+
    WIP: Girlfriend & Network+
  7. zimbo
    Honorary Member

    zimbo Petabyte Poster

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    That has to be the best way to remember that for my uni exams in may!!! Reps to you!!! :biggrin
     
    Certifications: B.Sc, MCDST & MCSA
    WIP: M.Sc - Computer Forensics
  8. zebulebu

    zebulebu Terabyte Poster

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    LOL - certainly better than the old 'All People Seem To Need Data Processing' or 'Please Do Not Throw Sausage Pizza Away' mnemonics I was taught!
     
    Certifications: A few
    WIP: None - f*** 'em
  9. greenbrucelee
    Highly Decorated Member Award

    greenbrucelee Zettabyte Poster

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    ha LOL I used to want to do that when I was a teenager.

    Seems like a good way to remember 8)
     
    Certifications: A+, N+, MCDST, Security+, 70-270
    WIP: 70-620 or 70-680?
  10. Becki

    Becki Byte Poster

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    Nice one, i just stick to the plain old:

    All
    People
    Seem
    To
    Need
    Data
    Processing

    :biggrin
     
    Certifications: NVQ IC3 A+ Network+ MCDST MCITP MCTS Vista & 7
  11. JonGlory

    JonGlory Byte Poster

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    Some
    People
    Fight
    Back

    sessions or segments (lol cant remember) :oops:
    Packets
    Frames
    Bits
     
    WIP: LIFE
  12. MrNerdy

    MrNerdy Megabyte Poster

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    The other one i know is this one from the top down:
    All-Polar bears-Swim-To-Near-Deep-Pools
     
    Certifications: ECDL, CiscoIT1 & A+
    WIP: Girlfriend & Network+
  13. BrotherBill

    BrotherBill Byte Poster

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    Well, you certainly found some interesting ways to remember the names of the layers and their order. Somehow, I think you're going to get into them a lot deeper than that. I'd suggest you heed the words of Dmarsh and Trip in their original posts and reread the objectives. Good Luck.
     
  14. Jiser

    Jiser Kilobyte Poster

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    Back to my sixth form and A-Level days:

    All
    People
    Seem
    To
    Need
    Data
    Processing
     
    Certifications: BSc (Hons), PGc, MCTS:Win 7, MCSA W7/MCITP EDST, ITIL Foundation, Prince 2 Foundation, C&G: Web Design, MOS 07: Excel, Word, Powerpoint, Outlook.
  15. GiddyG

    GiddyG Terabyte Poster Gold Member

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    I remembered this using:

    Sid
    Plays
    Football
    Badly

    Dunno... it worked for me... lol :oops:
     

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