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Virtual Routing and Forwarding

5 minutes 5 Questions

Virtual Routing and Forwarding (VRF) is a technology that allows multiple instances of routing tables to coexist in a single router. Each instance of VRF can have its own set of routes, interfaces, and routing protocols, providing complete network segmentation and isolation between virtual environm…

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CompTIA Network+ - Virtual Routing and Forwarding Example Questions

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Question 1

A network administrator needs to separate customer traffic for three different departments within the same virtual router. Which Virtual Routing and Forwarding (VRF) configuration should be implemented?

Correct Answer: Create three VRF instances

The best solution for separating traffic for three different departments within the same virtual router would be to create three Virtual Routing and Forwarding (VRF) instances. Each VRF instance would hold the department's IP routing configuration that is associated with the department and its interfaces, keeping the department's traffic and paths isolated. Creating three virtual routers would be excessive and beyond the requirements specified, as traffic can be separated within a single virtual router. Creating a VRF group would not necessarily separate the traffic of each department. Using three different routing protocols would unnecessarily complicate network management and does not inherently separate traffic by department.

Question 2

An engineer needs to implement VRF Lite to achieve traffic separation between the sales and engineering departments. After creating two VRF instances, the routes are not being shared between instances. How should this issue be resolved?

Correct Answer: Configure route leaking between VRF instances

The engineer should 'Configure route leaking between VRF instances' to resolve the issue. Route leaking is the process of making available routes of one VRF to another VRF on the same router. This approach allows sharing of selective routes, thus providing controlled traffic flow between VRFs. 'Enable Inter-VRF routing' is not a correct solution because it does not exist as a feature or command in VRF Lite implementations. 'Configure a single VRF instance' would not achieve the traffic separation that the engineer wants between the sales and engineering departments. 'Assign same route-target for both instances' is also not applicable as route targets are used in more complex MPLS/VPN implementations, and not in VRF Lite.

Question 3

When configuring multiple VRF instances on a router, a network engineer notices that routes are not being imported from the global routing table to VRF instances. What can be done to fix this?

Correct Answer: Configure route import/export between global and VRF instances

When working with multiple VRF (Virtual Routing and Forwarding) instances on a router, ensure that routes are imported or exported as necessary. By configuring route import/export between global and VRF instances, routes can move from the global routing table to the VRF instances. The other options listed, such as enabling global routing within VRF instances, configuring BGP peering, or configuring OSPF between global and VRF instances, are incorrect because they do not specifically address the task of moving routes from the global table to the VRF instances.

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