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Comment on Basic networking/subnetting question.

possiblylinux127@lemmy.zip ⁨1⁩ ⁨day⁩ ago

Subnets are on layer 3 not layer 2. You can easy access other devices on layer 3 by finding the right subnet on layer 2. ARP is used to resolve IP addresses into MAC addresses and vis versa.

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marauding_gibberish142@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago
Thanks, but isn’t ARP contained inside a subnet? I guess you could find everything if you inspected the MAC table of the main switch

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- possiblylinux127@lemmy.zip ⁨1⁩ ⁨day⁩ ago
  ARP is in the broadcast domain (otherwise known as a lan)
  
  Vlans create multiple lans
  
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  - marauding_gibberish142@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago
    Ah, I see. Thanks
    
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- nottelling@lemmy.world ⁨1⁩ ⁨day⁩ ago
  no. Arp bridges layer 1 and 2. It’s switch local. With a VLAN, it becomes VLAN local, in the sense that 802.1q creates a “virtual” switch.
  
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  - marauding_gibberish142@lemmy.dbzer0.com ⁨1⁩ ⁨day⁩ ago
    Sorry, I’m not sure what you mean by “ARP bridges L1 and L2”. I’ll have to read more about this. Other than that, I understand what you said.
    
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  - possiblylinux127@lemmy.zip ⁨1⁩ ⁨day⁩ ago
    ARP is in a single broadcast domain which can span multiple switches.
    
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