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School/Analyse/Layers/3. Network Layer.md
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@ -22,4 +22,23 @@ Steps:
A router can not practically store all hosts in the table as that would be way to many. A router can not practically store all hosts in the table as that would be way to many.
So instead the router stores only possible destination networks. So instead the router stores only possible destination networks.
The address to identify a host on a networks should have the format:
{Network, Host}
## Forwarding
When a router receives a packet:
1. Extracts the destination address from packet.
2. Separates the network ID from the rest of the address.
3. Looks if it can match the networks id in routing table.
4. If Match found: Sends packet using suggested paths in its table for that destination.
5. If no match found: Send packet over the default path which is the path to the next (probably a higher level) router.
### Separating network ID from address
Router needs to know how many digits are used as network ID.
Routers keep this information in their routing table.
A binary number named a netmask