Understanding Default , Static and Floating Static Routing

1) Default Routing:

Default routing is a method used by routers to forward packets when there is no specific route entry in the routing table for the destination network. Instead of dropping the packet, the router forwards it based on a pre-defined default route. This route is often referred to as the "gateway of last resort" or "default gateway".

For example, if a router receives a packet for a network it doesn't have a specific route for, it will use the default route to send the packet to another router or gateway that has a better understanding of where to send it next.

Default routes are useful in cases where a router doesn't have specific knowledge of all possible networks but knows at least one router that does.

2) Static Routing:

Static routing involves manually configuring the routes in a router's routing table. These routes are configured by a network administrator.

With static routing, the routes don't change unless a network administrator makes changes to them. It's a simple and efficient method for small networks where the network topology doesn't change frequently.

Static routing is less flexible than dynamic routing protocols (like OSPF, EIGRP, BGP, etc.) because it doesn't adapt to changes in the network automatically. It's typically used in scenarios where the network is relatively stable.

3)Floating Static Routing:

Floating static routing is a technique used to provide a backup or secondary route in case the primary route  becomes unavailable.

It involves configuring a static route with a higher administrative distance so that it is less preferred than other routes in the routing table. If the primary route fails, the floating static route becomes active.

This is commonly used as a backup solution in case the primary connection to a network goes down. 

In summary, default routing is used when no specific route is available, static routing involves manually configuring routes, and floating static routing provides a backup route in case the primary route fails. Each of these techniques has its own use cases and benefits depending on the network environment and requirements.