VLAN -- what's the deal?

mguymguy Member Posts: 167 ■■■□□□□□□□
in CCNA & CCENT
I have two pcs in different networks connected to a router via switch.

192.168.100.1 255.255.255.0
192.168.200.1 255.255.255.0

Both are in the same VLAN (vlan1)

They are communicating just fine. What's the deal with VLAN? Why do we need them? If I put on the VLAN it'll be more configurations (trunking).

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Comments

  • HeeroHeero Member Posts: 486
    Separation of broadcast domains is a big reason. Security as well. You can run different networks over the same layer 2 infrastructure using the same vlan. It is just not ideal. I have done this a few times, but in every scenario it has been more of a hack.
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  • HackedAliasHackedAlias Member Posts: 34 ■■□□□□□□□□
    Separation of broadcast domains, separation of various traffic (data, voice, wireless etc). Increased security and logical separation of various hosts/devices for easier network management.
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  • docricedocrice Member Posts: 1,706 ■■■■■■■■■■
    Because anyone in the first network can re-IP their machine and all of a sudden they're in the second network. It's built-in "VLAN-hopping" capability. All ARP broadcasts are seen by everyone, even if it wasn't intended for their network. Security nightmare.
    Hopefully-useful stuff I've written: http://kimiushida.com/bitsandpieces/articles/
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  • Ltat42aLtat42a Member Posts: 587 ■■■□□□□□□□
    We had separate VLANs set up at work that would allow "Guests" wireless access to the internet, yet they couldn't access our intranet.
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  • drkatdrkat Banned Posts: 703
    I guess the real question is: Why wouldn't you use a vlan? - this is just a sloppy design besides what are you using as your default gateways and how is your router set up? i'd be interested to see...
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  • NetworkVeteranNetworkVeteran Member Posts: 2,338 ■■■■■■■■□□
    drkat wrote: »
    I guess the real question is: Why wouldn't you use a vlan? - this is just a sloppy design
    In my home network, every device is in its own VLAN--my PC, my printer, my cell phone, even my Internet router! It's mad secure! ;)
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  • drkatdrkat Banned Posts: 703
    NetworkVeteran wrote: »
    In my home network, every device is in its own VLAN--my PC, my printer, my cell phone, even my Internet router! It's mad secure! ;)

    heh... ocd ;)
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  • MrBishopMrBishop Member Posts: 229
    NetworkVeteran wrote: »
    In my home network, every device is in its own VLAN--my PC, my printer, my cell phone, even my Internet router! It's mad secure! ;)

    LOL, now that is too funny! WTF
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