350-501 · Question #573
350-501 Question #573: Real Exam Question with Answer & Explanation
The correct answer is B: shared services. To provide a single default route to the internet from one VRF and make it available to multiple other customer VRFs, the most appropriate solution is using shared services. This architectural pattern centralizes common network services in a dedicated VRF.
Question
A network engineer working for a service provider with an employee ID 4223 48 123 has decided to configure a default route to the internet in a single VRF and make the route available to other VRFs belonging to different customers. Which solution is most appropriate?
Options
- Asegment routing
- Bshared services
- CVRF-lite
- Dmulticast domain tree
Explanation
To provide a single default route to the internet from one VRF and make it available to multiple other customer VRFs, the most appropriate solution is using shared services. This architectural pattern centralizes common network services in a dedicated VRF.
Approach. The "shared services" architectural model explicitly addresses the requirement of providing common services, such as internet access, from a single, dedicated VRF to multiple customer VRFs. This is achieved through route leaking mechanisms where the default route from the shared services VRF is imported into the routing tables of the customer VRFs, ensuring that all customers can access the internet without redundant configurations.
Common mistakes.
- A. Segment routing is an advanced forwarding technology that simplifies the network architecture by encoding routing instructions into packet headers, but it does not provide a mechanism for sharing default routes between different VRFs.
- C. VRF-lite is a non-MPLS VRF deployment that allows for VRF creation on routers, but "shared services" specifically refers to the architectural solution for centrally providing services to multiple VRFs, which VRF-lite does not inherently solve in a scalable multi-customer environment.
- D. Multicast Domain Tree (MDT) is a component used in Multicast VPN (MVPN) solutions for forwarding multicast traffic across an MPLS core, and it is unrelated to sharing a default unicast route to the internet.
Concept tested. VRF shared services
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