Configuring VRF 'Inet' on FastEthernet0/0

C.

The correct answer is C. R1(config)# ip vrf Inet R1(config-vrf)#interface FastEthernet0/0 R1(config-if)#ip vrf forwarding Inet.

To enable a Virtual Routing and Forwarding (VRF) instance on an interface, you need to perform two configuration steps:

1. Create the VRF instance:

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   R1(config)# ip vrf <vrf-name> 

   In this case, the VRF instance name is "Inet", which is already provided in the question. Therefore, the first step is:

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   R1(config)# ip vrf Inet 

2. Associate the interface with the VRF instance:

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   R1(config-vrf)#interface <interface-type><interface-number> R1(config-if)#ip vrf forwarding <vrf-name> 

   In this case, the interface is FastEthernet0/0, which is also provided in the question. Therefore, the second step is:

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   R1(config-vrf)#interface FastEthernet0/0 R1(config-if)#ip vrf forwarding Inet 

   This configuration tells the router to use the "Inet" VRF instance to forward traffic on the FastEthernet0/0 interface.

Option A is incorrect because it tries to assign the VRF instance to the interface configuration. However, the "ip vrf" command is used to create the VRF instance, not to assign it to an interface.

Option B is incorrect because it tries to assign the VRF instance directly to the interface, without creating the VRF instance first.

Option D is incorrect because it is configuring OSPF routing protocol with VRF, and not assigning the VRF instance to the interface.