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As obvious by name “MANUAL” method of IP assignment is shown up when you assign an IP address of a particular interface yourself using ip address command. It’s given in the below snapshot:

manual

On the other hand “SLARP” is totally different. SLARP stands for Serial Line Address Resolution Protocol. When a router is reloaded, it sends DHCP DISCOVER requests in order to find a DHCP Server. If it cannot find a DHCP Server, it will search a BOOTP Server. And if it fails to find BOOTP Server, it sends RARP or SLARP requests. RARP will be used in LAN environments while SLARP is used in serial lines for assigning an IP address to a interface. Check the below snapshot for SLARP IP assignment:

slarp

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