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  1. Junior Member Registered Member
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    #1

    Default Coverage of topics for L1 , L2 and L3

    Hi All,

    I am trying getting to know / brush up the skills on L1,L2 and L3. Query is what to cover ?.

    I am thinking below topics..


    L2 : VLAN , STP ,RSTP , VTP ,ARP ,BOTTP and DHCP
    L3 : RIP,OSPF,BGP and IS-IS

    IP : IP Addressing , Subnettting , Supernetting , IPv4 and IPv6

    No idea on L1 .. at all what to cover..? .

    I need inputs from you like , what else should be covered here .. ? .

    Final objective is to get to know the domain of L1,L2 and L3 technologies.

    Thanks
    vlrk
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  3. Senior Member CryptoQue's Avatar
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    #2
    Layer 1 (physical layer) of the OSI covers bits, line configuration, transmission mode, data rates, cabling, wire speeds, voltage, physical media, etc. Some things to look into:

    - Cabling Types & Speeds: Coax, Twisted Pair, Fiber
    - Hubs
    - Repeaters
    - NIC Cards, DTE, DCE
    - Full duplex, half duplex
    - point-to-point, point-to-multipoint
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  4. Senior Member
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    #3
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  5. Junior Member Registered Member
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    #4
    Thanks a lot ...
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  6. Senior Member
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    #5
    Quote Originally Posted by CryptoQue View Post
    Layer 1 (physical layer) of the OSI covers bits, line configuration, transmission mode, data rates, cabling, wire speeds, voltage, physical media, etc. Some things to look into:

    - Cabling Types & Speeds: Coax, Twisted Pair, Fiber
    - Hubs
    - Repeaters
    - NIC Cards, DTE, DCE
    - Full duplex, half duplex
    - point-to-point, point-to-multipoint
    Out of topic but i thought hubs are obsolete in the market?
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    #6
    Quote Originally Posted by dppagc View Post
    Out of topic but i thought hubs are obsolete in the market?
    They are and should never be used especially in a production environment. I think they are shown so much in CCENT because they highlight why you would use switches more in a network as it shows the effects of collisions.

    I've certainly not seen any for sale any time recently
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  8. Senior Member stryder144's Avatar
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    #7
    Quote Originally Posted by dppagc View Post
    Out of topic but i thought hubs are obsolete in the market?
    barberj66 is correct, though I have heard of a few really small companies utilizing hubs.
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  9. Senior Member CryptoQue's Avatar
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    #8
    Quote Originally Posted by barberj66 View Post
    They are and should never be used especially in a production environment. I think they are shown so much in CCENT because they highlight why you would use switches more in a network as it shows the effects of collisions.

    I've certainly not seen any for sale any time recently
    Correct...I only gave the example for exam purposes and not for real world use.
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  10. Member
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    #9
    Quote Originally Posted by CryptoQue View Post
    Correct...I only gave the example for exam purposes and not for real world use.
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  11. Senior Member Magic Johnson's Avatar
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    #10
    Quote Originally Posted by stryder144 View Post
    barberj66 is correct, though I have heard of a few really small companies utilizing hubs.
    I saw a 30 user environment which had a hub here:

    Router > Hub > 2x24p SW

    and various hubs under desks despite cat5 being present.

    Funnily enough they blamed ridiculous performance issues on the ISP.

    That feel when you first see a hub in the wild that's actually in use:

    Last edited by Magic Johnson; 07-25-2017 at 12:23 PM.
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  12. Senior Member CryptoQue's Avatar
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    #11
    One day hubs will become nonexistent...but somehow some companies rather have a cost effective LAN verses a secure and stable LAN.
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