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IT Certifications · 300-515 SPVI

Cisco Implementing Cisco Service Provider VPN Services Exam Practice Test

The 300-515 SPVI practice page focuses on service provider VPN implementation, especially the routing and forwarding choices involved in MPLS Layer 3 VPNs and Layer 2 VPN services. The available question bank samples route-target use, PE-CE routing, VRF assignment, VPN labels, IPv6 VPN routes, pseudowires, and Ethernet VPN forwarding behavior.

Exam overview

Exam providerCisco
Exam code300-515 SPVI
CategoryIT Certifications

About the Cisco Implementing Cisco Service Provider VPN Services Exam

VPN implementation requires keeping customer routing information separate while exchanging selected routes between provider edge routers. Practice scenarios cover how route targets control VPN route import and export, how PE-CE routing policy can constrain advertisements, and how customer AS paths may affect route acceptance. Other questions address placing interfaces in the correct VRF, identifying source-address validation that can drop customer traffic, and carrying IPv6 VPN prefixes over an IPv4 provider core. Layer 2 service questions examine the role of pseudowires and mechanisms that limit distribution of unknown-unicast frames in multipoint Ethernet VPNs. These concepts support configuration review and fault isolation: trace a route through the relevant VRF and BGP policy, distinguish transport and service labels, and identify whether a forwarding failure arises at the customer edge, provider edge, or across the VPN service.

Sample Practice Questions

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

Question 1

How are route targets most commonly used in an MPLS Layer 3 VPN?

  1. AAs BGP attributes that guide VPN route import and export between VRFs
  2. BAs labels that identify the outgoing core interface
  3. CAs identifiers for the provider's IGP areas
  4. DAs replacements for customer IP prefixes
Show answerCorrect answer: A

Route targets are extended BGP communities attached to VPN routes. PE routers use them in import and export policies to determine which VRFs exchange those routes.

Question 2

A PE-CE eBGP session is configured with a customer AS that also appears in the provider's AS path for a VPN route. What is a common BGP behavior that can prevent the CE from accepting that route?

  1. AThe CE detects its own AS in the AS_PATH and rejects the route
  2. BThe CE rejects the route because its next hop is an Ethernet address
  3. CThe CE automatically converts the route to an OSPF external route
  4. DThe CE removes the route target and accepts the route
Show answerCorrect answer: A

BGP commonly rejects a route when the receiving router finds its own AS number in the AS_PATH, preventing routing loops. AS-override or similar provider-side techniques may be used when the design requires handling overlapping customer AS numbers.

Question 3

A customer reports that its VPN traffic is being dropped because the PE rejects packets with an unexpected source address. Which feature is a common cause when enabled on the customer-facing interface?

  1. AUnicast Reverse Path Forwarding (uRPF) source validation
  2. BBGP route reflection
  3. CMPLS label distribution
  4. DOSPF graceful restart
Show answerCorrect answer: A

uRPF validates packet source addresses against routing information and may drop packets that fail the configured check. This can affect traffic with asymmetric paths or source prefixes not represented as expected in the relevant routing context.

Question 4

A PE router must carry customer IPv6 prefixes across an MPLS Layer 3 VPN while the provider core continues to forward IPv4. Which capability is commonly used for the VPN routes?

  1. AMP-BGP VPNv6 address family
  2. BIPv4 unicast static routes on every core router
  3. COSPFv3 adjacency between all customer sites
  4. DEthernet VLAN translation in the core
Show answerCorrect answer: A

The VPNv6 address family allows BGP to advertise IPv6 VPN routes, including VPN-specific attributes, between provider-edge routers. The provider core can still use IPv4 transport to reach PE next hops when the design supports it.

Question 5

A provider wants to constrain which routes a CE can advertise to a PE over a routing protocol session. Where is a route prefix filter most directly applied?

  1. AAt the PE's customer-facing routing boundary
  2. BOn every core transit link's MPLS label stack
  3. COnly on the remote PE's loopback interface
  4. DOn the provider's DNS resolver
Show answerCorrect answer: A

Applying an inbound prefix filter at the PE-CE boundary allows the provider to control which customer routes enter the provider routing system. Core label forwarding and DNS configuration do not filter routing updates at that boundary.

Question 6

What is the usual function of a pseudowire in a provider Layer 2 VPN service?

  1. ATo emulate a point-to-point Layer 2 connection across a packet-switched network
  2. BTo exchange VPN-IPv4 routes between provider-edge routers
  3. CTo assign an RD to each customer Ethernet frame
  4. DTo provide an IGP adjacency between customer routers
Show answerCorrect answer: A

A pseudowire emulates a point-to-point Layer 2 service across a packet-switched provider network, carrying the customer's Layer 2 traffic between attachment circuits at provider edges.

Question 7

What is the main purpose of the service label in a typical MPLS Layer 3 VPN packet delivered to an egress PE?

  1. ATo identify the VPN or forwarding context in which the packet should be processed
  2. BTo identify the physical interface on the ingress PE where the packet arrived
  3. CTo carry the full customer IP destination address in compressed form
  4. DTo choose the provider-core IGP metric for the packet
Show answerCorrect answer: A

The service (often called VPN) label identifies the forwarding context or disposition associated with the VPN route at the egress PE. It does not encode the complete IP destination or select the core IGP path.

How to use this practice test

The free practice session draws up to 20 random questions from the 50-question bank. Answer scenarios involving VPN route exchange, PE-CE policy, MPLS forwarding, and Layer 2 services, then review the displayed results to identify concepts that need more work.

Preparation tips

  • Trace a sample MPLS Layer 3 VPN route from CE advertisement through the PE VRF and VPN route exchange, noting where route targets affect import and export.
  • Compare the roles of the transport label and service label, and identify which label directs traffic to the egress PE versus the customer VPN context.
  • Work through PE-CE BGP cases involving customer AS-path checks and prefix filters; distinguish route rejection from a route that is simply not advertised.
  • For a reported forwarding failure, check the interface VRF, customer source-address validation, and IPv6-over-IPv4 VPN capability before changing routing policy.
  • Review how pseudowires carry Layer 2 services and how limiting unknown-unicast distribution affects multipoint Ethernet VPN forwarding.
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