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300-510Updated 8d ago · Aug 28, 2026

300-510 SPRI: Implementing Cisco Service Provider Advanced Routing Solutions

263 questions across 1 topics, with suggested answers, explanations where available, and imported community discussion. The first 26 questions are free to preview.

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Question 1 · MPLS and Segment Routing Open

Refer to the exhibit. Router 1 is located in a different data center from Router 2 and Router 3. Router 1 runs the IS-IS routing protocol and is preconfigured with LDP and segment routing. Which configuration must an engineer apply under `router isis 111` on Router 1 to implement TI-LFA on the link to Router 2 without disrupting traffic to Router 3?

Question exhibit
Answer: C IS-IS TI-LFA on Cisco IOS XR is enabled per interface under `address-family ipv4 unicast` with `fast-reroute per-prefix` and `fast-reroute per-prefix ti-lfa`. Configuring those commands on GigabitEthernet0/0/1 selectively protects the Router 2-facing link, while the Router 3-facing GigabitEthernet0/0/2 remains unaffected. **Learn more:** [Cisco IOS XR: Configure Topology-Independent Loop-Free Alternate (TI-LFA)](https://www.cisco.com/c/en/us/td/docs/iosxr/cisco8000/segment-routing/25xx/configuration/guide/b-segment-routing-cg-cisco8000-25xx/configuring-topology-independent-loop-free-alternate.html)
Question 2 · Multicast Routing Open

Refer to the exhibit. The network is configured for multicast with PIM-SM. A server attached to R3 sends multicast data to hosts on R4. To accommodate anticipated network growth, the network engineer with employee ID **123456789** has decided to use Auto-RP to dynamically assign a rendezvous point (RP). Which action must be performed?

Question exhibit
Answer: A Traditional Cisco Auto-RP relies on dense-mode flooding of its RP-Announcement and RP-Discovery control groups so routers can learn dynamic group-to-RP mappings. Consequently, PIM-enabled interfaces must be configured for sparse-dense mode (unless an alternative Auto-RP listener design is explicitly configured). A Bootstrap Router (BSR) is a different RP-discovery mechanism. **Learn more:** [Cisco IOS XE PIM Configuration Guide — Sparse-Dense Mode for Auto-RP](https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst9300/software/release/16-5/configuration_guide/ip_mcast_rtng/b_165_ip_mcast_rtng_9300_cg/b_165_ip_mcast_rtng_9300_9500_cg_chapter_0100.html)
Question 3 · Routing Policy and Manipulation Open

Drag and drop the BGP route-selection attributes from the left into the correct sequence on the right. Not all options are used. <DragDrop items={["lowest router ID","highest router ID","lowest local preference","if both paths are external, prefer the newest path","highest local preference","highest weight","eBGP over iBGP paths","if both paths are external, prefer the oldest path","lowest MED"]} slots={[{"answer":"highest weight","id":"step1","label":"Step 1"},{"answer":"highest local preference","id":"step2","label":"Step 2"},{"answer":"lowest MED","id":"step3","label":"Step 3"},{"answer":"eBGP over iBGP paths","id":"step4","label":"Step 4"},{"answer":"if both paths are external, prefer the oldest path","id":"step5","label":"Step 5"},{"answer":"lowest router ID","id":"step6","label":"Step 6"}]} explanation={"BGP selects the path with the highest Weight, then the highest local preference. Among the listed later tie-breakers, it prefers the lowest MED, then an eBGP path over an iBGP path, then the oldest path when both paths are external, and finally the lowest router ID."} reuse={false} />

Answer: —