Module Self-Check - Implementing Cisco MPLS

Use the questions here to review what you learned in this module. The correct answers and solutions are found in the Module Self-Check Answer Key.

Q1) In an MPLS VPN implementation, what is a VRF? (Source: Using MPLS VPN Mechanisms of Cisco IOS Platforms)

A) the routing and forwarding instance for all sites belonging to a single customer B) the routing and forwarding instance for all sites belonging to a single customer

location

C) the routing and forwarding instance for all sites using a common routing protocol

D) the routing and forwarding instance for a set of sites with identical connectivity requirements

Q2) Why are VRFs used to establish separate routing protocol contexts? (Source: Using MPLS VPN Mechanisms of Cisco IOS Platforms)

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Q3) Which two protocols are VPN-aware? (Choose two.) (Source: Using MPLS VPN Mechanisms of Cisco IOS Platforms)

A) RIPv2 B) IS-IS

C) ODR

D) EIGRP

Q4) True or False? VRFs are assigned to an interface. (Source: Using MPLS VPN Mechanisms of Cisco IOS Platforms)

Q5) A PE router is supporting site A for a VPN on one interface using RIP as the routing protocol. Site B belongs to the same VPN and is being supported on a second interface using EBGP as the routing protocol. Why is it necessary to redistribute the RIP-learned route into the per-VRF instance of the BGP process? (Source: Using MPLS VPN Mechanisms of Cisco IOS Platforms)

A) to allow site A and B to communicate with each other

B) to allow the RIP route to be propagated to the VRF routing tables C) to allow the RIP routes to be propagated to the local EBGP session D) to allow the RIP routes to be propagated through the backbone MP-BGP

process to other PE routers

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Q6) How are VPNv4 routers propagated to a RIP-speaking CE router? (Source: Using MPLS VPN Mechanisms of Cisco IOS Platforms)

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Q7) Which command do you use to create a VRF named VPNA? (Source: Configuring VRF Tables)

A) ip vrf VPNA B) ip rt vrf VPNA C) ip rd vrf VPNS

D) ip vrf forwarding VPNA

Q8) Which two VRF parameters specify the extended community attribute used in VPNv4 BGP? (Choose two.) (Source: Configuring VRF Tables)

A) rd route-distinguisher B) route-target export RT C) route-target import RT D) ip vrf forwarding vrf-name

Q9) Which command do you use to associate interface e0/0 with a VRF named VPNA?

(Source: Configuring VRF Tables) A) ip vrf VPNA

B) ip vrf VPNA int e0/0 C) ip vrf forwarding VPNA D) ip vrf VPNA forwarding e0/0

Q10) What happens to the interface of an existing IP address when you associate the interface with a VRF? (Source: Configuring VRF Tables)

A) It will remain unchanged.

B) It will be removed from the interface.

C) It will be changed to the loopback 0 address.

D) It will be moved under the VRF configuration.

Q11) You have created a configuration that defines three import route targets (650001:01, 650002:02, and 650003:03) for a VRF. A route update has three RTs (650003:03, 650004:04, and 650005:05) attached to it. How will this update be processed and why?

(Source: Configuring VRF Tables)

A) The update will be accepted by the VRF because it matches the import RD of 03.

B) The update will be discarded by the VRF because it does not match all of the RTs in the import list.

C) The update will be accepted by the VRF because it matches at least one of the RTs in the import list.

D) The update will be discarded by the VRF because it does not match all of the RDs in the import list.

Q12) In which two ways does the MPLS VPN architecture use the BGP routing protocol?

(Source: Configuring an MP-BGP Session Between PE Routers)

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Q13) What is a BGP address family? (Source: Configuring an MP-BGP Session Between PE Routers)

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Q14) What are the two types of BGP address families that can be configured on a PE router?

(Source: Configuring an MP-BGP Session Between PE Routers)

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Q15) Which mandatory parameters do you have to configure on an MP-BGP neighbor?

(Source: Configuring an MP-BGP Session Between PE Routers)

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Q16) Why is it necessary to enable extended BGP communities when you are supporting MPLS VPNs? (Source: Configuring an MP-BGP Session Between PE Routers)

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Q17) Why would you want to disable propagation of IPv4 routing updates between MP-BGP neighbors? (Source: Configuring an MP-BGP Session Between PE Routers)

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Q18) How do you configure the routing context in RIP? (Source: Configuring Small Scale Routing Protocols Between PE and CE Routers)

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Q19) How do you propagate static VRF routes between PE routers? (Source: Configuring Small Scale Routing Protocols Between PE and CE Routers)

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Q20) How would you configure redistribution to propagate customer RIP routing updates across the MPLS VPN backbone? (Source: Configuring Small Scale Routing Protocols Between PE and CE Routers)

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Q21) Which three commands do you use to display all configured VRFs on the router?

(Source: Monitoring MPLS VPN Operations)

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Q22) How do you verify the contents of a VRF routing table? (Source: Monitoring MPLS VPN Operations)

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Q23) Why is the BGP protocol always running in every VRF and how would you display the BGP parameter related to a VRF? (Source: Monitoring MPLS VPN Operations) ______________________________________________________________________

Q24) How do you verify that a session has been established between two VPNv4 neighbors?

(Source: Monitoring MPLS VPN Operations)

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Q25) How do you verify the contents of a BGP VPNv4 routing table? (Source: Monitoring MPLS VPN Operations)

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Q26) Which three commands can be used to display per-VRF FIB and LFIB information?

(Source: Monitoring MPLS VPN Operations)

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Q27) Which command can be used to display tags assigned to local or remote VRF routes by the local or remote PE router? (Source: Monitoring MPLS VPN Operations)

Q28) Which command do you use to perform each of the following traceroutes? (Source:

Monitoring MPLS VPN Operations)

Ingress CE to egress PE:

Q29) Why is the OSPF superbackbone needed in MPLS VPN environments? (Source:

Configuring OSPF as the Routing Protocol Between PE and CE Routers)

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Q30) What is the interaction between Area 0 and a superbackbone? (Source: Configuring OSPF as the Routing Protocol Between PE and CE Routers)

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Q31) What is the interaction between a superbackbone and other areas? (Source: Configuring OSPF as the Routing Protocol Between PE and CE Routers)

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Q32) How are OSPF route attributes propagated across an MPLS VPN backbone? (Source:

Configuring OSPF as the Routing Protocol Between PE and CE Routers)

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Q33) What is the purpose of the down bit in an LSA header? (Source: Configuring OSPF as the Routing Protocol Between PE and CE Routers)

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Q34) Why do you need a VRF route limit command? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q35) When would you need the AS-override feature? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q36) How does the AS-override feature work? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q37) When would you need the allowas-in feature? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q38) When is it necessary to use the AS-override feature instead of the allowas-in feature?

(Source: Configuring BGP as the Routing Protocol Between PE and CE Routers) ______________________________________________________________________

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Q39) How do you prevent BGP loops when using AS-override? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q40) How do you prevent BGP loops when using allowas-in? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q41) What is the Site of Origin? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q42) When would you have to use the Site of Origin? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q43) Where can you set the Site of Origin? (Source: Configuring BGP as the Routing Protocol Between PE and CE Routers)

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Q44) What are the preliminary MPLS VPN troubleshooting steps? (Source: Troubleshooting MPLS VPNs)

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Q45) Which command do you use to verify that the PE router is receiving customer routes from the CE router? (Source: Troubleshooting MPLS VPNs)

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Q46) How do you verify the routing information exchange between PE routers? (Source:

Troubleshooting MPLS VPNs)

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Q47) How do you verify redistribution of VPNv4 routes into the PE-CE routing protocol?

(Source: Troubleshooting MPLS VPNs)

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Q48) How do you test end-to-end data flow between PE routers? (Source: Troubleshooting MPLS VPNs)

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Q49) How do you verify that the PE router ingress interface supports CEF switching?

(Source: Troubleshooting MPLS VPNs)

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Q50) How do you verify that there is an end-to-end LSP? (Source: Troubleshooting MPLS VPNs)

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Q51) How do you verify that the LFIB entry on the egress PE router is correct? (Source:

Troubleshooting MPLS VPNs)

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In document Implementing Cisco MPLS (Page 175-184)