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Can one subnet access another subnet?

Discussion in 'Network+' started by zr79, Jul 24, 2009.

  1. zr79

    zr79 Byte Poster

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    Say you have the following,

    192.18.1.0 with a mask 255.255.255.240 then you have 4 bits borrowed, 16 subnets 14 valid hosts per subnet (that 14 is minus the network and broadcast addresses) so the first 2 subnets would be

    192.168.1.1 ---> 192.168.1.14
    192.168.1.17 ---> 192.168.1.30

    I don't see point here, can a PC with say ip 192.168.1.5 not ping a PC in subnet 2 with say 192.168.1.20 anyway.

    Ok so you have created 16 subnets but can't they access each other anyway, what am i missing?
     
    Certifications: A+
  2. BosonMichael
    Highly Decorated Member Award

    BosonMichael Yottabyte Poster

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    Not without a router to route the packets from one subnet to another.

    Aha! That's the point of network segmentation! If you want to logically subdivide your network, you can do so. If you want to route between them, you can do so. If you want to limit access per subnet, you can do so.
     
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  3. jk2447

    jk2447 Petabyte Poster Moderator

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    BM has provided the answer, you need a router. Just to add that for security purposes, you can use subnets to hide departments on different subnets from each other so that Accounts can't see HR etc
     
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  4. BosonMichael
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    BosonMichael Yottabyte Poster

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    ...

    ;)
     
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  5. jk2447

    jk2447 Petabyte Poster Moderator

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    Ha ha sorry Boson, I didn't realise you'd already said that. I must not of read it correctly :oops: . . . .
     
    Certifications: BSc (Hons), HND IT, HND Computing, ITIL-F, MBCS CITP, MCP (270,290,291,293,294,298,299,410,411,412) MCTS (401,620,624,652) MCSA:Security, MCSE: Security, Security+, CPTS, VCP4, CCA (XenApp6.5), MCSA 2012, VCP5, VCP6-NV
  6. BosonMichael
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    BosonMichael Yottabyte Poster

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    Well, your definition spells it out much more clearly than mine does. As long as understanding is gained, it's all good! :thumbleft
     
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  7. jk2447

    jk2447 Petabyte Poster Moderator

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    Absolutely, well said :usa
     
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  8. soundian

    soundian Gigabyte Poster

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    Never rely on only one source of information...
    ...in action.

    Here's my attempt.
    Think not what can routers do for me, think instead, what can't routers do for me.
    Routers don't forward traffic intended for the same subnet from which it was sent. That includes broadcast traffic.
    This essentially means that 10 computers on the finance subnet can communicate with each other as much as they like without the 10 computers on the Human Resources subnet having their bandwidth eaten up.
     
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