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CCNP Enterprise Core (350-401) Cisco Routing

Static Null Routes

The null interface is a non-physical interface that is always in an up state.

Any traffic that is sent to the virtual null interface is dropped without any additional overheads added to the CPU.

Configuring a static route towards a null interface provides a method of dropping network traffic without the need of an access list.

ip route 192.168.0.0 255.255.0.0 Null0

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