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| Section | Objectives |
|---|---|
| MPLS VPN Services Implementation | - L2VPN services
|
| VPN Fundamentals in Service Provider Networks | - MPLS VPN architecture
|
| Service Provider VPN Operations | - Performance and scalability considerations - QoS in MPLS VPN environments - Troubleshooting VPN connectivity |
| Advanced VPN Technologies | - Multicast VPN (MVPN) - Inter-AS VPN architectures - Segment routing integration with VPNs |
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NEW QUESTION # 130
Which utility can you use to validate an LSP in an MPLS environment?
Answer: D
Explanation:
Section: VPN Architecture
NEW QUESTION # 131
What is the role of the BGP protocol in CE-to-PE communication?
Answer: C
Explanation:
On the CE-to-PE link, BGP's job is to act as the PE-CE routing protocol - exchanging the customer's reachability information with the provider. Using BGP address families, that exchange covers both IPv4 and IPv6 routes (the CE advertises its prefixes to the PE, and the PE advertises routes back). The CE is a normal IP router in this relationship; it hands its routes to the PE via BGP, and the PE then carries them across the VPN backbone. Label handling is a core/PE function, not part of the CE-PE route exchange itself.
NEW QUESTION # 132 
An engineer is trying to configure an EVPN VWPS. What is the issue with this configuration?
Answer: C
Explanation:
Reference: https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_l2_vpns/configuration/xe-3s/asr903/16-7-1/ b-mpls-l2-vpns-xe-16-7-asr900/epvn_vpws_single_homed.pdf
NEW QUESTION # 133
SIMULATION 3
Guidelines
This is a lab item in which tasks will be performed on virtual devices.
* Refer to the Tasks tab to view the tasks for this lab item.
* Refer to the Topology tab to access the device console(s) and perform the tasks.
* Console access is available for all required devices by clicking the device icon or using the tab(s) above the console window.
* All necessary pre-configurations have been applied.
* Do not remove any existing configurations from the devices, only those necessary to make the appropriate changes required to fulfill the listed tasks.
* Do not change the enable password or hostname for any device.
* Save your configurations to NVRAM before moving to the next item.
* Click Next at the bottom of the screen to submit this lab and move to the next question.
* When Next is clicked, the lab closes and cannot be reopened.
Topology
Tasks
R1 through R6 are routers that provide IGP underlay for the MPLS provider.
Candidate are required to perform below configuration and verification tasks as noted.
1. Troubleshoot R3 to establish OSPF adjacency with R4.
2. Troubleshoot R5 to form MPLS session on port 646 and ensure R1 to R6 LSP is built.
Initial configuration with IP addressing has been completed. The candidate must not make any changes to the configurations except to fulfill the tasks listed above. Do not change the preconfigured network-type. Only R3 and R5 may to be modified for the solutions. Also ensure the solution show in the config.
Answer:
Explanation:
On R3, add ip ospf mtu-ignore under the interface connected to R4 (e0/0 toward 10.3.4.0/30).
On R5, change the label protocol to LDP (port 646) and enable it on the core interfaces, for example:
mpls label protocol ldp
mpls ip on the R5 core interfaces toward R4 and R6.
The OSPF neighborship between the two routers is prevented by an MTU mismatch on the R3- R4 link. Adding the command to ignore MTU for OSPF on the R3-facing interface allows OSPF to build a full adjacency without altering the preconfigured network type on either side of the link.
In the MPLS underlay, the other provider routers are running LDP, which uses TCP/UDP port
646, while R5 is using a different label protocol. Changing the label protocol on R5 to LDP and ensuring MPLS is enabled on its core-facing interfaces lets R5 establish LDP sessions with its neighbors. Once these LDP adjacencies are up, labels are exchanged end to end and a continuous LSP is built between R1 and R6.
NEW QUESTION # 134
Refer to the exhibit. A customer is experiencing a VPN traffic outage: The VPN connection CustomerLMN between PEA and PEC is down. After debugging, the service provider network engineer found that the VRF RD and RT values are correctly configured on PEA and PEC, and MP-BGP peering is up between the PE routers. Which configuration resolves this issue?
Answer: A
Explanation:
Under the MP-BGP (vpnv4) session you must signal the route-target extended communities, and under the VRF's IPv4 address-family you must inject (redistribute) the connected customer subnet into BGP.
NEW QUESTION # 135
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