Free Nokia Virtual Private Routed Networks Practice Questions

Sample Practice Questions

Try these 10 sample questions from the Nokia Virtual Private Routed Networks practice bank. Each includes the answer and explanation. Continue with the interactive practice above to review the full question set.

1. 1In a basic VPRN, where is the separate IP forwarding table for each customer VPRN maintained?

   1. A.On every provider core router
   2. B.On each associated provider edge routerCorrect answer: B
   3. C.On the route reflector for the service
   4. D.On every remote customer edge router

   Explanation: The guide states, "Each associated PE router maintains a separate IP forwarding table for each VPRN." Thus the associated PE maintains the per-VPRN forwarding table.

   Reference: SR OS Layer 3 Services Guide: VPRN service — VPRN service overview

2. 2A provider connects several spoke CEs to one PE and must prevent them from communicating directly while retaining them in one VPRN. Which SR OS configuration addresses that requirement?

   1. A.Use one VPRN with type hub for the spoke sites
   2. B.Use VPRN type spoke with suitable route-target policiesCorrect answer: B
   3. C.Use one VPRN with a shared RD and no spoke type
   4. D.Use route-target policies without the spoke-type setting

   Explanation: Nokia says, "Introducing the VPRN type spoke feature allows multiple spoke sites to be kept within the same VPRN instance while at the same time maintaining the split horizon approach". This addresses the same-PE spoke isolation requirement.

   Reference: Layer 3 VPN: VPRN Type Spoke — Overview, VPRN type spoke

3. 3A provider deploys Inter-AS option A between two ASBRs. How are the VRFs connected across the AS boundary?

   1. A.Exchange labeled VPN routes over a shared ASBR eBGP session
   2. B.Connect matching VRFs through separate border subinterfacesCorrect answer: B
   3. C.Connect all VRFs through one shared global routing instance
   4. D.Exchange VPN routes by multihop eBGP between remote PEs

   Explanation: Nokia says, "The back-to-back VRF connections between the ASBR nodes require individual sub-interfaces, one for each VRF." This is the option-A per-VRF interconnection.

   Reference: SR OS Layer 3 Services Guide: VPRN service — Inter-AS VPRNs, Inter-AS option-A

4. 4In a carrier-supporting-carrier VPN, what service does the super carrier provide to the customer carrier?

   1. A.The customer carrier transports the super carrier's backbone over an IP VPN
   2. B.The super carrier provides enterprise CE routing directly at every customer site
   3. C.The super carrier transports part of the customer carrier backbone over an IP VPNCorrect answer: C
   4. D.The customer carrier provides a VRF for the super carrier's backbone

   Explanation: Nokia describes CSC as allowing a customer carrier "to use the IP VPN service of another service provider (the Super Carrier) for some or all of its backbone transport." The super carrier supplies the transport service.

   Reference: Carrier Supporting Carrier IP VPNs — Overview

5. 5In the SR OS VPRN architecture, what does BGP distribute along with a VPN route?

   1. A.A PE-to-CE interface address
   2. B.A customer Ethernet VLAN tag
   3. C.An MPLS label for the routeCorrect answer: C
   4. D.An LDP session identifier

   Explanation: The guide states, "When BGP distributes a VPN route it also distributes an MPLS label for that route." The label accompanies the route in the VPN routing exchange.

   Reference: SR OS Layer 3 Services Guide: VPRN service — VPRN service overview

6. 6In the documented SR OS VPRN type spoke design, which routes populate the primary internal VRF?

   1. A.Routes learned from remote spoke CEs through MP-BGP
   2. B.Routes learned from the locally connected spoke CEsCorrect answer: B
   3. C.Routes learned from locally connected hub CEs
   4. D.Routes learned from remote hub sites through MP-BGP

   Explanation: The guide states, "This VRF is populated with routes learned from the spoke CE sites connected to the local PE". This passage refers to the primary VRF.

   Reference: Layer 3 VPN: VPRN Type Spoke — Overview, internal VPRN logic

7. 7In an Inter-AS option-A deployment, how does an ASBR VPRN instance view its back-to-back connection to the neighboring AS?

   1. A.As a labeled IPv4 transport session to a remote PE
   2. B.As an external interface to a remote customer siteCorrect answer: B
   3. C.As an internal MP-iBGP session to a route reflector
   4. D.As a shared VPN-IPv4 eBGP session on the base router

   Explanation: The guide states, "each VPRN instance views the inter-AS connection as an external interface to a remote VPRN customer site." This describes the service perspective of option A.

   Reference: SR OS Layer 3 Services Guide: VPRN service — Inter-AS VPRNs, Inter-AS option-A

8. 8Who operates the CSC-CE that peers with a super carrier's CSC-PE?

   1. A.A separate transit service provider
   2. B.The enterprise end customer
   3. C.The super carrier
   4. D.The customer carrierCorrect answer: D

   Explanation: Nokia defines CSC-CE as a "Peering router managed and operated by the Customer Carrier" and connected to CSC-PEs for CSC backbone transport.

   Reference: Carrier Supporting Carrier IP VPNs — Overview, CSC device roles

9. 9A provider must carry overlapping customer IPv4 addresses between PE routers. What makes a VPN-IPv4 address distinct across VPRNs?

   1. A.Adding a route reflector identifier to the address
   2. B.Adding a customer Ethernet tag to the address
   3. C.Adding an interface metric to the address
   4. D.Adding a route distinguisher to the addressCorrect answer: D

   Explanation: The guide says, "A VPN-IPv4 address is a 12-byte value consisting of the 8-byte route distinguisher (RD) and the 4-byte IPv4 IP address prefix." The RD extends the prefix so overlapping customer addresses can be distinguished.

   Reference: SR OS Layer 3 Services Guide: VPRN service — Core MP-BGP support

10. 10In an SR OS type-spoke VPRN, which internal VRF forwards traffic arriving from spoke SAP interfaces toward network interfaces?

    1. A.The secondary VRFCorrect answer: A
    2. B.The base routing table
    3. C.The primary VRF
    4. D.The route reflector RIB

    Explanation: Nokia describes the secondary VRF as "used for forwarding traffic from the IP interfaces using SAPs or spoke SDPs toward the network interfaces or other VPRN instances." That matches the direction in the question.

    Reference: Layer 3 VPN: VPRN Type Spoke — Overview, internal VPRN logic