350-401 · Question #25
350-401 Question #25: Real Exam Question with Answer & Explanation
The correct answer is C: performs route leaking between user-defined virtual networks and shared services. Fusion Router in SD-Access In Cisco SD-Access, the fusion router sits at the boundary between Virtual Networks (VNs) and shared services, performing route leaking - the controlled redistribution of routes between isolated VNs and common resources (like DHCP, DNS, or internet serv
Question
What is the role of a fusion router in an SD-Access solution?
Options
- Aprovides connectivity to external networks
- Bacts as a DNS server
- Cperforms route leaking between user-defined virtual networks and shared services
- Dprovides additional forwarding capacity to the fabric
Explanation
Fusion Router in SD-Access
In Cisco SD-Access, the fusion router sits at the boundary between Virtual Networks (VNs) and shared services, performing route leaking - the controlled redistribution of routes between isolated VNs and common resources (like DHCP, DNS, or internet services) that multiple VNs need to access without full VN merging.
Why the distractors are wrong:
- Option A describes the role of a border node, which connects the SD-Access fabric to external networks like the WAN or internet - not the fusion router.
- Option B (DNS server) is an infrastructure service role, completely unrelated to the fusion router's routing/forwarding function.
- Option D describes a capacity-scaling function, which relates to fabric edge or intermediate nodes, not the fusion router.
🧠 Memory Tip: Think of the word "fusion" - it fuses (joins) together separate, isolated VNs with shared services by leaking routes between them. If VNs are islands, the fusion router is the controlled bridge to the shared mainland - without merging the islands themselves.
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