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School/Analyse/Layers/3. Network Layer.md
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@ -84,7 +84,18 @@ We now do have a addressing issue because:
So we need a new type of ID to uniquely identify a host in the internet.
This address will we at a higher level of protocols
This address will we at a higher level of protocols (Network layer) and is therefore protocol dependent.
### IPV4
IPV4 are 4 byte integers. We use them in the following format:
0-255.0-255.0-255.0-255 ex. 192.168.100.1
This is called a dotted decimal, each address contains 4 decimals of 8 bits (octets)
Example: 00000000.00000000.00000000.00000000
## Classful addresses
Classfull addresses define 3 networks types
Class A: First decimal shows the network ID, remaining 3 decimals show the host ID. (Large networks)