350-401 Question #68: Real Exam Question with Answer & Explanation

Question

Which two statements about VRF-lite are true? (Choose two)

Options

• AIt can increase the packet switching rate.
• BIt supports most routing protocols, including EIGRP, ISIS, and OSPF.
• CIt supports MPLS-VRF label exchange and labeled packets.
• DIt should be used when a customer's router is connected to an ISP over OSPF.
• EIt can support multiple customers on a single switch.

Explanation

VRF-Lite Explained

VRF-lite (Virtual Routing and Forwarding without MPLS) allows a single physical device to maintain multiple independent routing tables, making it ideal for separating customer traffic - which is why E is correct: one switch can serve multiple customers with complete routing isolation. D is correct because VRF-lite is specifically designed for CE (Customer Edge) to PE (Provider Edge) scenarios, such as when a customer router connects to an ISP, allowing traffic separation without requiring full MPLS infrastructure.

Why the distractors are wrong:

• A is incorrect - VRF-lite adds routing table overhead, which can actually decrease switching performance
• B is incorrect - VRF-lite does not support IS-IS; it primarily supports EIGRP, OSPF, BGP, and static routes, but IS-IS is not VRF-aware in this context
• C is incorrect - VRF-lite explicitly operates without MPLS; label exchange and labeled packets are features of full MPLS-VPN, not VRF-lite

🧠 Memory Tip: Think of the "lite" in VRF-lite as "without labels" - it gives you VRF traffic separation but strips away the MPLS complexity, making it perfect for simple multi-customer or ISP edge scenarios.

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