Cisco 642-889 Exam Question to Pass Early

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Question No. 1

In the Carrier Ethernet architecture, which device maintains L2TPv3 connections?

Answer: C

Question No. 2

A regional operations center needs to deliver L3VPNs for a very large customer and needs a better understanding of what is necessary to implement an

MPLS L3VPN. What is the biggest advantage to using the MPLS VPN model instead of the peer-to-peer model?

Answer: C

Question No. 3

Which three security features can be implemented on PEs inside a Cisco IOS XR VPLS environment? (Choose three.)

Answer: A, B, C

Question No. 4

Which option describes what differentiates a U-PE from N-PE?

Answer: A

Question No. 5

Refer to the exhibit.

XR2 must be configured with OSPF sham-link to PE1. Which configuration achieves this goal?

Answer: B

Question No. 6

Which Layer 2 protocol parameters can be carried inside the control word when implementing AToM service?

Answer: B

Q . How does Frame Relay over MPLS work?

A . Traffic is encapsulated in MPLS packets and forwarded across the MPLS network. When encapsulating Frame Relay over MPLS, the Frame Relay header and the frame check sequence (FCS) are stripped from the packet. The bits for Backward Explicit Congestion Notification (BECN), Forward Explicit Congestion Notification (FECN), Discard Eligibility (DE) and Command/Response (C/R) are carried across the MPLS network in the “Control Word” header.

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