Cisco 300-515難易度 & 300-515受験料

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Cisco 300-515 Exam Syllabus Topics:

Section	Weight	Objectives
VPN Architecture	25%	- Troubleshoot underlay (Core IGP, LSP) - Compare VPN architecture (Layer 2 vs Layer 3, Inter-AS/Intra-AS) - Describe L3VPN data plane (underlay label, VRF forwarding, VPNv6) - Describe Layer 2 service architecture (IOS XR Ethernet Flowpoints, IOS XE EVCs) - Describe L3VPN control plane (MP-BGP, RD, RT, VPN labels, VRF, PE-CE)
Layer 3 VPNs	35%	- Describe Inter-AS L3VPNs (Options A, B, AB, C) - Implement multicast VPN (Intranet, Extranet, mLDP) - Troubleshoot Intra-AS L3VPNs (PE-CE, PE-PE, PE-RR) - Describe CSC concepts - Implement extranet/shared services (route targets/policy) - Describe routing requirements (MP-BGP, PE-CE routing)
IPv6 VPNs	10%	- Troubleshoot IPv6 VPN provider edge (PE-PE, PE-CE) - Describe IPv6 VPN routing requirements (MP-BGP, PE-CE)
Layer 2 VPNs	30%	- Describe EVPN concepts (data plane/control plane, multihoming, suppression, forwarding) - Troubleshoot L2VPN services (E-LAN, E-Line, E-Tree) - Implement Ethernet OAM - Implement EVPN (IRB, VPWS, native)

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Cisco Implementing Cisco Service Provider VPN Services 認定 300-515 試験問題 (Q66-Q71):

質問 # 66
Refer to the exhibit. PE1 and PE2 are exchanging VPNv4 routes for CE1 and CE2, and PE3 contains the default route to the internet. If the three devices are operating normally, which two conclusions describe this configuration? (Choose two.)

A. The CE1 and CE2 VRFs can access the default route provided by the Internet VRF.
B. All three routers must be running a distance-vector routing protocol.
C. The CE1 and CE2 VRFs can exchange routes only between their respective VRFs on PE1 and PE2.
D. All three routers must be running MP-BGP.
E. Only the CE2 VRF can access the default route provided by the Internet VRF.

正解：C、D

質問 # 67
Refer to the exhibit. Which effect of this configuration is true?

A. It configures an IPv4 peering with 192.168.1.1
B. It configures VPWS multihomed.
C. It configures VPWS single homed.
D. It configures MPLS traffic engineering.

正解：C

質問 # 68
Refer to the exhibit. A customer reported that traffic is failing to pass between Site-X and Site-Y.
The network engineer already verified that the connectivity between IS-IS and LDP is up from TP21 to TP31. PW 1000 and PW 2000 are configured with SPX. Which action must the engineer take to resolve the issue?

A. Configure SPX with the pw-class dynamic_mpls command under xconnect group MS-PW10 for SPX neighbors.
B. Configure neighbor 10.10.10.1 pw-id 1000 under a different xconnect group name.
C. Enable control-word under the pw-class configuration on SPX.
D. Enable preferred-path interface tunnel under the pw-class configuration on SPX.

正解：A

解説：
In an MPLS Layer 2 VPN, the pseudowire-class must be explicitly bound to the xconnect group so that all pseudowire parameters (encapsulation, signaling protocol, control-word setting) are applied to the neighbors. In the given configuration, the pw-class dynamic_mpls was defined but never associated under the xconnect group MS-PW10. Applying the pw-class dynamic_mpls under the xconnect ensures the pseudowires (PW 1000 and PW 2000) come up and traffic passes between Site-X and Site-Y.

質問 # 69
An engineer noticed that PE3 is failing to accept IPv6 traffic information from PE1.
The engineer confirmed that both PE3 and PE1 routers are configured accurately with IPv6 protocol.
To eliminate IPv6 traffic loss issue, which action must the engineer take to solve the problem?

A. Configure 6PE that provides global IPv6 reachability over IPv4 MPLS
B. Configure 6PE forwarding between 6PE routers based on the IPv6 header.
C. Disable 6PVE that provides local IPv6 reachability over MPLS.
D. Allow PE routers use the MP-iBGP extensions in the IPv6 network configuration to exchange IPv6 reachability information.

正解：D

解説：
For a Provider Edge (PE) router to accept and process IPv6 routing information from another PE router across an MPLS core, the control plane must be configured to exchange those specific network layer reachability details.
- Even if the individual PE routers are running IPv6 locally, they cannot share those prefixes over the MPLS core without Multi-Protocol Internal BGP (MP-iBGP).
- MP-iBGP introduces extensions (specifically the IPv6 address family, or address-family ipv6) that allow BGP to carry and distribute IPv6 routing updates and their associated MPLS labels between the PE routers.
Without enabling the IPv6 address family under the MP-iBGP peering sessions between PE1 and PE3, the routers will drop or fail to accept the IPv6 prefix updates.

質問 # 70
Refer to the exhibit.

Which result occurs when PE1 learns a new MAC address and all three PEs are enabled with EVPN native?

A. A system notification is sent to the network administrator that triggers the manual configuration of the new MAC address on PE2 and PE3.
B. The MAC address is entered into the CAM table only if it is learned on the native VLAN.
C. The new MAC address is sent by BGP to PE2 and PE3 as a Type 2 BGP route.
D. The MAC address is entered into the CAM table and is classified for use on the native VLAN

正解：C

解説：
Reference:
https://www.cisco.com/c/en/us/td/docs/routers/asr9000/software/asr9k-r6-4/lxvpn/configuration/ guide/b-l2vpn-cg-asr9000-64x/b-l2vpn-cg-asr9000-64x_chapter_01011.html

質問 # 71
......

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