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IT Certifications · 300-510 SPRI

Cisco Implementing Cisco Service Provider Advanced Routing Solutions Exam Practice Test

The 300-510 SPRI practice page focuses on advanced routing concepts used in service provider networks. Its question bank samples MPLS label distribution and Layer 3 VPN identifiers alongside IPv4 and IPv6 forwarding, BGP path attributes, OSPF and IS-IS behavior, and fast failure detection with BFD.

Exam overview

Exam providerCisco
Exam code300-510 SPRI
CategoryIT Certifications

About the Cisco Implementing Cisco Service Provider Advanced Routing Solutions Exam

Routing work in provider environments requires interpreting control-plane information and predicting how routers forward traffic. BGP questions can exercise the role of LOCAL_PREF in selecting paths within an autonomous system and the use of communities to tag routes for policy. OSPF and IS-IS concepts involve understanding link-state databases, shortest-path calculation, and the responsibilities of Level 2 routers. MPLS questions address how LDP distributes labels and how a route distinguisher keeps VPN routes distinct. Packet-forwarding scenarios can test TTL or Hop Limit expiration and address resolution on an Ethernet link. BFD adds another operational consideration: detecting a failed path quickly so a routing protocol can react. Together, these subjects support troubleshooting reachability, validating route selection, and tracing how traffic moves across routed provider infrastructure.

Sample Practice Questions

Review a selection from this exam's published US Practice Tests practice bank.

Question 1

In an MPLS network, what is the primary purpose of the label distribution protocol (LDP)?

  1. ATo distribute labels for establishing label-switched paths that follow IGP routes
  2. BTo exchange VPN customer routes between provider edge routers
  3. CTo encrypt traffic crossing the provider core
  4. DTo negotiate BGP autonomous system numbers
Show answerCorrect answer: A

LDP distributes label bindings for forwarding along paths determined by the IGP. VPN route exchange is typically handled by MP-BGP, while LDP does not provide encryption or negotiate AS numbers.

Question 2

For an IPv4 packet, which protocol message is normally sent back when a router cannot forward the packet because its TTL expires?

  1. AICMP Time Exceeded
  2. BICMP Redirect
  3. CTCP Reset
  4. DARP Reply
Show answerCorrect answer: A

When an IPv4 packet's TTL reaches zero during forwarding, the router discards it and normally sends an ICMP Time Exceeded message to the source, subject to applicable policy and message-generation rules.

Question 3

In BGP, what is the purpose of the LOCAL_PREF attribute within an autonomous system?

  1. ATo indicate the AS path length to external neighbors.
  2. BTo influence which exit path routers in the AS prefer for outbound traffic.
  3. CTo identify the router ID of the originating BGP speaker.
  4. DTo prevent a route from being installed in the routing table.
Show answerCorrect answer: B

LOCAL_PREF is used within an AS to express the preferred exit for traffic destined to a route. When comparing otherwise eligible paths, a higher LOCAL_PREF is preferred; it is typically propagated to iBGP peers rather than eBGP peers.

Question 4

In OSPF, what does the SPF algorithm calculate from the link-state database?

  1. AThe shortest-path tree rooted at the calculating router
  2. BThe order in which neighbors become designated routers
  3. CThe set of BGP paths permitted by route policy
  4. DThe maximum transmission unit of each outgoing interface
Show answerCorrect answer: A

OSPF runs Dijkstra’s shortest-path-first algorithm against its link-state database to calculate a shortest-path tree rooted at the local router. Routes are then derived from that tree and installed as appropriate.

Question 5

An IPv6 router receives a packet with a Hop Limit of 1 and needs to forward it to another link. What should the router do?

  1. AForward it and decrement the Hop Limit to 0.
  2. BDiscard it and normally send an ICMPv6 Time Exceeded message to the source.
  3. CReplace the Hop Limit with the interface's configured value.
  4. DSend an ICMPv6 Packet Too Big message.
Show answerCorrect answer: B

A router decrements the IPv6 Hop Limit when forwarding. If the value expires, the router discards the packet and normally returns an ICMPv6 Time Exceeded message, subject to applicable policy and ICMP handling.

Question 6

What is the primary role of a route distinguisher in an MPLS Layer 3 VPN?

  1. AMake identical customer prefixes unique when represented in the VPN routing information
  2. BDetermine which customer routes a VRF is allowed to import
  3. CEncrypt the VPN route updates between provider routers
  4. DSet the preferred next hop for all routes in a VRF
Show answerCorrect answer: A

A route distinguisher creates a unique VPN-IPv4 representation for a route, allowing overlapping customer address spaces. Route targets, rather than route distinguishers, are commonly used to control route import and export.

Question 7

In IS-IS, what is the general purpose of a Level 2 router?

  1. ATo provide routing within a single area only
  2. BTo participate in routing between IS-IS areas
  3. CTo distribute IPv4 addresses to adjacent hosts
  4. DTo act as the sole gateway for all external protocols
Show answerCorrect answer: B

Level 2 routers exchange reachability between IS-IS areas, forming the inter-area backbone. Level 1 routing is used for intra-area reachability.

How to use this practice test

Access the practice questions for free. A session presents up to 20 random questions from the available bank, which contains 50 published questions, and shows your results afterward. Use missed items to identify whether you need to revisit routing attributes, link-state behavior, MPLS concepts, or packet forwarding.

Preparation tips

  • Trace how a change to BGP LOCAL_PREF affects route choice within an autonomous system; distinguish that decision from the role of communities in route policy.
  • Review the path from OSPF link-state database to SPF calculation, and contrast it with the Level 2 role in IS-IS.
  • Draw an MPLS Layer 3 VPN route flow and note how LDP label distribution differs from the route distinguisher's function.
  • Work through IPv4 TTL and IPv6 Hop Limit expiration scenarios, including the expected response when a router cannot forward the packet.
  • Compare BFD failure detection with routing-protocol timers, then consider how faster detection changes convergence behavior.
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