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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: Layer 2 VPNs | 30% | - Troubleshoot L2VPN services (E-LAN, E-Line, E-Tree) - Describe EVPN concepts (data plane/control plane, multihoming, suppression, forwarding) - Implement Ethernet OAM - Implement EVPN (IRB, VPWS, native) |
| Topic 2: VPN Architecture | 25% | - Describe L3VPN data plane (underlay label, VRF forwarding, VPNv6) - Compare VPN architecture (Layer 2 vs Layer 3, Inter-AS/Intra-AS) - Describe L3VPN control plane (MP-BGP, RD, RT, VPN labels, VRF, PE-CE) - Troubleshoot underlay (Core IGP, LSP) - Describe Layer 2 service architecture (IOS XR Ethernet Flowpoints, IOS XE EVCs) |
| Topic 3: Layer 3 VPNs | 35% | - Describe Inter-AS L3VPNs (Options A, B, AB, C) - Describe routing requirements (MP-BGP, PE-CE routing) - Describe CSC concepts - Troubleshoot Intra-AS L3VPNs (PE-CE, PE-PE, PE-RR) - Implement extranet/shared services (route targets/policy) - Implement multicast VPN (Intranet, Extranet, mLDP) |
| Topic 4: IPv6 VPNs | 10% | - Describe IPv6 VPN routing requirements (MP-BGP, PE-CE) - Troubleshoot IPv6 VPN provider edge (PE-PE, PE-CE) |
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NEW QUESTION # 176
Which two functions describe CsC architecture on the network? (Choose two.)
Answer: C,E
Explanation:
Carrier-of-carrier (CsC) lets smaller carriers peer with a larger backbone carrier so those carriers' customers can reach remote sites across the backbone.
In a CsC model the backbone carrier only carries the downstream carrier's summarized routes (not individual end-user prefixes), so it doesn't install or learn end-customer routes in its core.
NEW QUESTION # 177
SIMULATION 5
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
CE1 and CE2 are IPv6 Customer Premise Equipment of two customers that communicate with each other through the MPLS L3VPN core comprising Provide Edge PE1, PE2, and route- reflector RR.
Perform the below configuration and verification tasks as noted.
1. Troubleshoot and modify RR to allow PE1 to receive VPNv4 routes from PE2 and vice versa.
2. Troubleshoot the PE routers to ensure the CEs can ping each other via their Loopback 0 addresses.
The initial configuration with IP addressing has been completed. Do not change the configurations except to fulfill the abovementioned tasks. Apply the solution with the minimum configuration to allow additional PEs if needed.
Answer:
Explanation:
1. On RR - make it a VPNv4 route-reflector for the PEs
Under BGP on RR, in the VPNv4 address-family, configure the PE neighbors as route-reflector clients (keeping the existing neighbors and update-source as they are), for example:
router bgp <SP-AS>
address-family vpnv4
neighbor 10.2.2.2 route-reflector-client ! PE1 loopback
neighbor 10.4.4.4 route-reflector-client ! PE2 loopback
exit-address-family
If not already present, neighbor <PE-lo0> activate and neighbor <PE-lo0> send-community extended must also be under address-family vpnv4
2. On PE1 and PE2 - fix VRF import/export so CE loopbacks are reachable end-to-end On both PEs, in the VRF used for CE1/CE2, ensure that the same route-target value is used for both import and export so that VPNv4 routes are imported into the correct VRF on the remote PE.
For example (names and values adapted to the actual config):
ip vrf CUST-A
rd 65000:1
route-target export 65000:1
route-target import 65000:1
(or adjust the existing route-target commands so that PE1 and PE2 share at least one identical import/export RT).
The RR receives all VPNv4 routes from the PEs, but without the route-reflector-client configuration in the VPNv4 address family it does not reflect those routes between the PEs.
Making the PE neighbors RR-clients (and ensuring they are activated with extended communities) allows the RR to advertise each PE's VPNv4 routes to the other, so PE1 learns CE2's VRF routes and PE2 learns CE1's.
Even with VPNv4 exchange working, CE loopback reachability between sites depends on the PEs importing the received VPNv4 routes into the correct VRF. That import is controlled by route- targets; both PEs must use a common route-target value for export and import. Once the RTs match, each PE imports the other's CE routes into the same VRF, and the IPv6 (or IPv4, depending on the lab) loopback prefixes of CE1 and CE2 become reachable across the MPLS L3VPN core, allowing successful ping between their Loopback0 interfaces.
NEW QUESTION # 178
Refer to the exhibit.
What is the effect of this configuration?
Answer: B
NEW QUESTION # 179
Drag and drop the EVPN components from the left onto the correct planes on the right.
Answer:
Explanation:
Explanation
Reference:
https://www.cisco.com/c/dam/m/en_us/network-intelligence/service-provider/digital-transformation/ knowledge-network-webinars/pdfs/0420-epn-ckn.pdf slide 8
NEW QUESTION # 180 
An engineer is trying to configure an EVPN VWPS. What is the issue with this configuration?
Answer: B
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 # 181
......
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