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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: IPv6 VPNs | 10% | - Troubleshoot IPv6 VPN provider edge (PE-PE, PE-CE) - Describe IPv6 VPN routing requirements (MP-BGP, PE-CE) |
| Topic 2: VPN Architecture | 25% | - Troubleshoot underlay (Core IGP, LSP) - Describe L3VPN control plane (MP-BGP, RD, RT, VPN labels, VRF, PE-CE) - Compare VPN architecture (Layer 2 vs Layer 3, Inter-AS/Intra-AS) - Describe Layer 2 service architecture (IOS XR Ethernet Flowpoints, IOS XE EVCs) - Describe L3VPN data plane (underlay label, VRF forwarding, VPNv6) |
| Topic 3: Layer 2 VPNs | 30% | - Describe EVPN concepts (data plane/control plane, multihoming, suppression, forwarding) - Implement Ethernet OAM - Troubleshoot L2VPN services (E-LAN, E-Line, E-Tree) - Implement EVPN (IRB, VPWS, native) |
| Topic 4: Layer 3 VPNs | 35% | - Troubleshoot Intra-AS L3VPNs (PE-CE, PE-PE, PE-RR) - Implement multicast VPN (Intranet, Extranet, mLDP) - Implement extranet/shared services (route targets/policy) - Describe routing requirements (MP-BGP, PE-CE routing) - Describe CSC concepts - Describe Inter-AS L3VPNs (Options A, B, AB, C) |
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問題 #50
How do VPNv6 routes propagate between PEs?
答案：B
解題說明：
In IPv6 Layer 3 VPNs (VPNv6), the PE router attaches a Route Distinguisher (RD) to each IPv6 route in the VRF, creating unique VPNv6 routes. This ensures that multiple customers can use overlapping IPv6 address spaces while still being distinguishable in the MPLS backbone. The VPNv6 routes are then exchanged between PEs using MP-BGP.
問題 #51
Refer to the exhibit. At the request of the customer, an engineer from the service provider configures monitoring on the customer Ethernet links. The engineer implements Ethernet OAM to support the contractual SLA. The customer asked for the interface to be blocked when traffic exceeds 10 frames per second.
Which set of commands must the engineer implement?
答案：C
解題說明：
The ethernet oam link-monitor frame threshold 10 window 399 command configures a 10-frame- per-second threshold, and the high-threshold action error-disable-interface causes the interface to be shut when that threshold is exceeded.
問題 #52
Refer to the exhibit:
A network engineer is implementing an OSPF configuration Based on the output, which statement is true?
答案：A
問題 #53
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.)
答案：A,B
解題說明：
The data center routes behind PE1 are exported with route-target 101:101, so PE2 and PE3 must import this RT to learn and advertise those server prefixes toward CE2 and CE3. Conversely, the branch VRFs behind PE2 and PE3 use RTs 202:202 and 303:303 for their prefixes, so PE1 must import both of these RTs in its data center VRF to receive and advertise the branch host routes toward the servers. This mutual RT import ensures full reachability between hosts at CE2/CE3 and the servers behind PE1.
問題 #54
SIMULATION 1
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.
Tasks
CE1 and CE2 are customer premise equipment of the same customer that communicates with each other over L2VPN provider infrastructure comprising Provide Edge PE1, PE2, and P core routers.
Configure the PE routers to choose the configured Loopback 0 as its LDP identifier persistently.
Troubleshoot the PEs to establish a complete MPLS LSP path between them.
Troubleshoot and modify PE2 to ensure the configured L2VPN VC is up and passing traffic.
Initial configuration with IPv6 addressing has been completed. The candidate must not make any changes to the configurations except to fulfill the tasks listed above. Apply the solution with the minimum config.
P
PE1
PE2
CE1
CE2
答案：
解題說明：
To meet all three goals with the absolute minimum change, only add mpls ip to the pseudowire sub-interfaces on each PE. All LDP router-ID and PW-class work does not require for corrections.
On PE1 and PE2:
interface Ethernet0/0.100
mpls ip
That single command under the dot1Q sub-interface:
1. Brings up LDP on the PW-facing interface, so you'll see the full LSP from PE to PE.
2. Enables the VC to go UP and carry customer frames.
問題 #55
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