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Cisco 300-515 Exam Syllabus Topics:

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

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Cisco Implementing Cisco Service Provider VPN Services Sample Questions (Q171-Q176):

NEW QUESTION # 171
What is the main capability of the MPLS Option B Inter-AS L3VPN?

A. It leverages MP-BGP to distribute labeled IPv4 routes across multiple autonomous systems.
B. It provides full-mesh connectivity between PE routers in different autonomous systems to improve scalability.
C. It supports full-mesh VPNs between participating autonomous systems.
D. It enables the exchange of VPNv4 routes between ASBR using MP-BGP.

Answer: D

Explanation:
MPLS Inter-AS Option B allows ASBRs in different autonomous systems to exchange VPNv4 routes using MP-BGP. Each AS maintains its own MPLS core, and only labeled VPNv4 routes are exchanged between the ASBRs. This provides separation of MPLS domains while still enabling L3VPN connectivity across AS boundaries.

NEW QUESTION # 172
While configuring the VRF Selection feature, you get an error message after typing the below statement:
Router(config)#no vrf selection source 172.16.0.0 255.255.0.0 vrf VRF1
Which action caused this message?

A. an attempt to configure a VRF Selection table that does not exist
B. an attempt to remove a VRF Selection entry that does not exist
C. an attempt to configure a VRF instance on an interface that already has VRF Selection configured
D. the entry of an inconsistent IP address and mask for VRF Selection

Answer: B

Explanation:
Reference:
https://www.cisco.com/c/en/us/td/docs/ios/12_2/12_2sz/feature/guide/122szvrf.html

NEW QUESTION # 173
How is the underlay label managed in L3VPN data plane operations?

A. The label is swapped at each label-switching router in the service provider network.
B. The label is pushed at the ingress LER and remains unchanged through the MPLS label swap process in the network.
C. The label is pushed at the provider edge router and popped at the next provider router.
D. The label is unchanged on provider routers and popped at the egress router.

Answer: A

Explanation:
In an MPLS L3VPN, the ingress PE pushes both the VPN (inner) label and a transport (outer) label. Each MPLS LSR in the SP core examines the top (transport) label, swaps it for its next-hop label via its LFIB, and forwards the packet. Only the egress PE pops the transport label before delivering the packet to the CE.

NEW QUESTION # 174
Refer to the exhibit. A network engineer has been called to configure the four PE devices in order to enable full communication among the four CE devices connected to them. While starting to configure, he experienced a connectivity issue.
Which two tasks should the engineer perform in order to begin the process correctly? (Choose two.)

A. Configure PE4 to import route-targets 101:1 and 202:2.
B. Configure PE3 to export route-targets 100:1 and 200:2.
C. Configure PE1 to import route-targets 300:3 and 400:4.
D. Configure PE2 to export route-targets 300:3 and 400:4.
E. Configure PE3 to import route-targets 100:1 and 200:2.

Answer: B,E

NEW QUESTION # 175
Which mechanism reduces the network flooding caused by host ARP learning behavior?

A. root guard
B. BPDU guard
C. storm control
D. ARP suppression

Answer: D

Explanation:
Reference:
https://www.cisco.com/c/en/us/products/collateral/switches/nexus-7000-series-switches/white- paper-c11-735015.html

NEW QUESTION # 176
......

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