最新のCiscoの300-515認証試験

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Cisco 300-515 Exam Syllabus Topics:

Section	Weight	Objectives
Layer 2 VPNs	25%	- MPLS-based L2VPN services - VPWS and VPLS - Ethernet VPN (EVPN) - L2VPN configuration and verification - EVPN control plane and data plane - L2TPv3
IPv6 VPNs	15%	- 6VPE and 6PE - Dual-stack VPN operation - IPv6 VPN migration and troubleshooting - IPv6 PE-CE routing - MP-BGP for VPNv6 routes
VPN Architecture	25%	- VPN deployment models - Inter-AS and Intra-AS VPN - MPLS and VPN fundamentals - VPN service requirements and design considerations
Layer 3 VPNs	35%	- L3VPN troubleshooting - Inter-AS L3VPN options - MPLS L3VPN architecture - VRF and VRF-lite - PE-CE routing protocols - Route target and route distinguishers - MP-BGP for VPNv4 routes

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300-515資格模擬、300-515試験過去問

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Cisco Implementing Cisco Service Provider VPN Services 認定 300-515 試験問題 (Q139-Q144):

質問 # 139
Refer to the exhibit. CE1 and CE2 are members of an enterprise that requires L3VPN services to connect the remote sites. PE2 offers internet access to both CEs. The PE-CE routing protocol is OSPF. Connectivity is up, and each PE can ping its connected CE, but CE1 and CE2 cannot reach the internet. Which action resolves the issue?

A. Configure the same route distinguisher on each PE.
B. Configure Loopback0 with a /24 mask as the router ID on PE1, PE2, and PE3.
C. Configure PE1, PE2, and PE3 to be fully meshed.
D. Configure the specific import and export targets on PE1 and PE2.

正解：D

解説：
PE2 advertises Internet routes with RT 120:120, but PE1/PE3's VRFs aren't importing that RT, so CE1/CE2 never learn the default route. To fix this, on PE1 and PE3 under their address-family ipv4 vrf ... stanzas you must route-target import 120:120.
And on PE2's Internet VRF you should likewise export 120:120 (if not already). This aligns the export RT on PE2 with the import RT on PE1/PE3 so your remote sites will receive the Internet routes.

質問 # 140
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 Import of 101:101 on CE2 and CE3.
B. Implement an RT export of 101:101 on PE2 and PE3.
C. Implement an RT Import of 101:101 on PE2 and PE3.
D. Implement an RT export of 202:202 and 303:303 on CE2 and CE3.
E. Implement an RT Import of 202:202 and 303:303 on PE1.

正解：C、E

解説：
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.

質問 # 141
An engineer is investigating an EVPN traffic flow issue. Which type of traffic should the engineer allow in an EVPN Tree Service in order to fix this issue?

A. unknown unicast from a leaf to another leaf
B. known unicast from a root to another root
C. multicast from a leaf to another leaf
D. known unicast from a leaf to another leaf

正解：B

解説：
Reference:
https://tools.ietf.org/html/draft-ietf-bess-evpn-etree-14

質問 # 142
Refer to the exhibit. Router R1 is configured with the default OAM configuration with active mode enabled. After a series of link failures caused significant delays for users attempting to access the file server, the enterprise engineering team decided to implement Ethernet OAM to check for link failures and faults within the network.
Which action must the team take so that remote OAM is alerted when a fault occurs?

A. Implement discovery to monitor links within the network and record errors.
B. Implement link monitoring to identify and capture error events.
C. Implement repetitive pings to identify when breaks in communication occur.
D. Implement repetitive traceroutes to monitor the path of Ethernet traffic.

正解：B

解説：
Ethernet OAM link monitoring is the mechanism responsible for detecting link faults and generating error events that can be signaled to the remote endpoint. By enabling link monitoring, the OAM process can identify degradation or failures and notify the remote device accordingly.

質問 # 143
In an L3VPN, how does a PE initially forward a packet it receives from a CE through the service provider network?

A. by binding it with a label that it receives from the destination CE
B. by binding it with a route target export assigned by the network administrator
C. by binding it with a route target import assigned by the network administrator
D. by binding it with a label that it receives from the destination PE

正解：D

解説：
In an MPLS L3VPN, each PE learns per-prefix VPN labels via MP-BGP from the remote PE.
When a CE's packet arrives, the local PE looks up the destination in its VRF, pushes the VPN label it learned from that remote PE, and then pushes (or swaps) any transport/LDP label to steer the packet through the SP core.

質問 # 144
......

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