Implementing Cisco Service Provider VPN Services

Question 1

In MPLS Layer 3 VPN implementations, which mechanism is used to control which routes are imported to a VRF?

A. RD

B. VC ID

C. PW ID

D. RT

E. VRF ID

Correct Answer: D

Question 2

Which utility can you use to validate an LSP in an MPLS environment?

A. uRPF

B. logging

C. RSVP

D. MPLS LSP ping

Correct Answer: D

Question 3

Refer to the exhibit. A network operator is implementing EVPN IRB on PE1. Which two command placements enable the advertisement of Type 2 routes and what information do Type 2 routes contain? (Choose two.)

A. Type 2 routes contain Ethernet Auto-Discovery information.

B. Type 2 routes contain inclusive source-specific multicast route information.

C. The operator adds in "host-routing" under the VRF EVPN.

D. The operator adds in "host-routing" under the BVI651 interface.

E. Type 2 routes contain MAC/IP information.

Correct Answer: D,E

Question 4

Which two statements describe primary differences between MPLS Layer 2 and Layer 3 VPNs?
(Choose two.)

A. Layer 2 VPNs use BGP, but Layer 3 VPNs use VPLS.

B. Layer 2 VPNs use AToM, but Layer 3 VPNs use MPLS/BGP.

C. Layer 2 VPNs use L2TPv3 tunneling, but Layer 3 VPNs use GRE tunneling.

D. Layer 2 VPNs use IPsec tunneling, but Layer 3 VPNs use L2TPv3 tunneling.

E. Layer 2 VPNs use IPsec tunneling, but Layer 3 VPNs use pseudowires to provide tunneling.

Correct Answer: B,C

Question 5

Refer to the exhibit. A customer with locations in New York and London uses multiple service providers to connect between its offices and to the data center where its servers are located The PE routers are participating in an MLDP, and each PE creates the same VRF to support the customer offices. PE1 is connected to the data centers. A network engineer must update the implementation so that new hosts connected to CE2 and CE3 can reach the servers connected to the data center.
Which two actions must the engineer take to support this communication? (Choose two.)

A. Implement an RT export of 101:101 on PE2 and PE3.

B. Implement an RT Import of 101:101 on CE2 and CE3.

C. Implement an RT Import of 202:202 and 303:303 on PE1.

D. Implement an RT export of 202:202 and 303:303 on CE2 and CE3.

E. Implement an RT Import of 101:101 on PE2 and PE3.

Correct Answer: C,E

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Question 6

What is the role of the BGP protocol in CE-to-PE communication?

A. It performs label exchange only.

B. It performs IPv6 route exchange with label forwarding only.

C. It performs IPv4 and IPv6 route exchange.

D. It performs routing and label forwarding.

Correct Answer: C

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Question 7

Refer to the exhibit. Routers PE1 and PE2 are in two major cities providing connectivity for a customer with offices in both locations. The customer installed a server at the main office to provide services to hosts at the other location over Layer 2. The networking team implemented an E-Line circuit to support the installation, but the connection failed to come up.
Which action must the team take to resolve the issue and bring up the E-Line connection?

A. Configure the encapsulation protocol as MPLS and IP.

B. Configure unique MPLS labels for local and remote values.

C. Increase the MTUs on both PEs to support pseudowires.

D. Change the VC IDs on the two PEs to match.

Correct Answer: D

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Question 8

In a typical service provider environment, which two tools are used to help scale PE router connectivity requirements? (Choose two.)

A. cluster ID

B. VPNv4 address family

C. confederations

D. originator ID

E. route reflectors

Correct Answer: C,E

Question 9

How do VPNv6 routes propagate between CEs?

A. The CE uses NAT64 to translate the IPv6 address into a unique IPv4 address, which is sent between sites.

B. A DHCP server assigns an IPv4 address and an IPv6 address to each host, and the CE sends traffic from those hosts between sites.

C. The CE uses Unified MPLS to assign labels to IPV6 traffic only, and then it sends traffic to the PEs using those labels.

D. The PE assigns an RD to each VRF and prepends the value to shared IPV6 routes, which allows two or more sites to use a single IP address space.

Correct Answer: D

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Question 10

Refer to the exhibit. The networking team of the service provider configured an L3VPN within the service provider core to provide connectivity between a customer's two offices. BGP is configured as the PE-CE routing protocol. The customer is using AS 65515, and the service provider is using AS 65516. After the L3VPN was established and BGP neighbor relationships were established at each customer site, the team determined that CE1 and CE2 cannot communicate. Which action must the team take to resolve the issue?

A. Enable BGP Split Horizon on the PEs to allow PE1 and PE2 to share BGP routes between CE1 and CE2.

B. Implement the allowas-in feature on the CEs to bypass the BGP loop prevention mechanism and permit the CEs to share routes.

C. Configure the AS-Override feature on both CE routers so that they share routes with one another.

D. Add and redistribute a static route into BGP on the PEs so that traffic passes between CE1 and CE2.

Correct Answer: B

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Question 11

What is the primary benefit provided by Unified MPLS?

A. It uses BGP to transport labels between different IGP domains which reduces the need to exceed the router's IGP route threshold.

B. It eliminates the need for labels to route traffic between autonomous systems.

C. It allows IPV6 routes to be carried outside of BGP.

D. It expands the capability of link-state routing protocols to hold multiple routes.

Correct Answer: A

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Question 12

Refer to the exhibit. A customer reported that traffic is failing to pass between Site-X and Site-Y.
The network engineer already verified that the connectivity between IS-IS and LDP is up from TP21 to TP31. PW 1000 and PW 2000 are configured with SPX. Which action must the engineer take to resolve the issue?

A. Configure SPX with the pw-class dynamic_mpls command under xconnect group MS-PW10 for SPX neighbors.

B. Configure neighbor 10.10.10.1 pw-id 1000 under a different xconnect group name.

C. Enable preferred-path interface tunnel under the pw-class configuration on SPX.

D. Enable control-word under the pw-class configuration on SPX.

Correct Answer: A

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Question 13

The CTO of a company requires the support of a network consultant to deliver an MPLS solution without resigning to a certain degree of redundancy and scalability. Which solution effectively scales to hundreds or thousands of sites?

A. L3VPN using a hierarchical topology of N-PEs and U-PEs.

B. L3VPN with direct LSP connectivity between all PEs.

C. L2VPN by encapsulating multiple frame formats with interworking.

D. L2VPN with the broadcast traffic processed at the ingress PE.

Correct Answer: A

Question 14

Refer to the exhibit. PE1 is located at a company's headquarters, with PE2 and PE3 at remote offices. A service provider implemented E-Tree for the company, with PE1 serving at the root and PE2 and PE3 serving as leaf nodes in the topology. For redundancy, PE3 offers some of the same services that that offered at headquarters. However, when the link to PE1 fails, users on PE2 cannot access the services on PE3. Which action must the engineer take to resolve the issue?

A. Add a secondary IP address to the interface facing the EVPN.

B. Set the same MAC address for MLACP on each device.

C. Reconfigure PE3 as a root node.

D. Change the L2transport encapsulation type to MPLS.

Correct Answer: C

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Question 15

Refer to the exhibit. OSPF is used as an underlayer routing protocol in the backbone network of this ISP. A network engineer recently configured R1 with ip cef and mpls label range 1000 2000.
Several days later, the engineer replaced a failed RP module on R1. After the replacement, one of the customer's MPLS LSPs went down with the error message LSP-ERROR-Indication:No Label Resources. Which action must the engineer take to resolve the issue?

A. Configure redistribute connected under the OSPF configuration.

B. Configure xconnect 10.0.0.2 100 encapsulation mpls vian 10 under interface Gi0/0/0.

C. Configure mpls ldp neighbor 10.0.0.2 targeted under the global configuration.

D. Configure mpls mtu 1600 under interface Gi0/0/0.

Correct Answer: C

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Cisco Implementing Cisco Service Provider VPN Services - 300-515 Exam Practice Test

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