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Terme informatique

Subnet Mask

The value that separates the network part and the host part of an IP address….

Networking
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Simple definition….

The mask tells a device which addresses are directly accessible on its local network and which require a gateway….

Technical definition….

In IPv4, it can be written in the form 255255.255.0 or /24. The 1-bits represent the network prefix and the remaining bits the part available for the hosts…

What’s the point?… ?

Set the size of a subnet, calculate the ranges you can use and organize a of address plan….

Concrete example…

With 192.168.1.25/214, the network is 192.168.1.0 and hosts usually use the addresses 192.168.1.1 to 192.168.1.254…

Common problems….

  • Different masks on devices of the same network….
  • Overlapping sub-networks…
  • Range too small for number of, equipment….
  • Confusion between mask and bridge….

IP address · Default Gateway. · VLAN · LAN · Router.

To be noted:. This sheet shows the general operation of the term. The exact settings can vary according to software, builders and environments.

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