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School/Analyse/Layers/3. Network Layer.md
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@ -93,9 +93,20 @@ IPV4 are 4 byte integers. We use them in the following format:
This is called a dotted decimal, each address contains 4 decimals of 8 bits (octets) This is called a dotted decimal, each address contains 4 decimals of 8 bits (octets)
Example: 00000000.00000000.00000000.00000000 Example: 00000000.00000000.00000000.00000000
## Classful addresses ### Classful addresses
Classfull addresses define 3 networks types Classful addresses define 3 networks types
Class A: First decimal shows the network ID, remaining 3 decimals show the host ID. (Large networks) Class A: First decimal shows the network ID, remaining 3 decimals show the host ID. (Large networks)
Class B: First two decimals shows the network ID, remaining 2 decimals show the host ID. (Mid networks)
Class C: First three decimals shows the network ID, remaining 1 decimal show the host ID. (Small networks)
### Classless addresses
In classless addresses the number of bits is used for a Network ID is given as a number after the address
Example 144.24.13.172/**20 (20 bits used for network ID)**
### Exceptions in IPV4
![[exceptions-ipv4.png]]

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