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Layers question

Discussion in 'Network+' started by Rob1234, Apr 6, 2008.

  1. Rob1234

    Rob1234 Megabyte Poster

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    Is this correct:

    Repeaters operate at Layer 1

    Bridges operate at layer 2

    switches operate at layer 2

    Hubs operate at layer 1

    Routers operate at layers 3

    Gateway operates at layer 5?

    NIC operates at layer 1

    I did do a search on Google but some were in different layers so I was not sure which was right.
     
    Certifications: A few.
  2. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    The snag is that these days these are a bit variable!
    Gateways can operate at layer 7 or higher.
    NICs can operate at both Layer 1 and 2.

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  3. GiddyG

    GiddyG Terabyte Poster Gold Member

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    Gateways will be level 7 or lower... you can't go higher than 7 can you? :eek:

    With gateway, won't where it sits in the OSI model be pretty much based on whether it is hardware or software too?
     
  4. hbroomhall

    hbroomhall Petabyte Poster Gold Member

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    Well - yes and no! When you use an app you are using layer 7 API (in theory) - the application layer. So you must be at a higher level!

    As a joke layer 8 is often used for users - see here.

    But I confess that I think that was a typo!
    Indeed - there are no hard and fast rules for that.

    But consider an ALG in a router. What layer is is running at?....

    :p

    Harry.
     
    Certifications: ECDL A+ Network+ i-Net+
    WIP: Server+
  5. sunn

    sunn Gigabyte Poster

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    There are switches that can reside in Layer 2 and 3.
    If you’re trying to understand the different OSI layers, you’ll probably be fine in what you stated above. :blink

    Try to remember what each layer is responsible for. Placing items in categories becomes easier from that point. :eek:
     
  6. GiddyG

    GiddyG Terabyte Poster Gold Member

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    Heh heh... I read into the rest of it too... I like to think in terms of CKB btw... Chair Keyboard Interface... not so many letters. :D

    Thank gawd for that! I went searching through my notes, just in case... :biggrin

    Well, I would have guessed at Layer 7... :rolleyes:
     

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