Cisco 642-889 Exam Preparation Questions – Pass With Guarantee

By | January 31, 2018

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Latest and Most Accurate Cisco 642-889 Dumps Exam Questions and Answers:

Question: 21

When troubleshooting EoMPLS configuration problems, which three parameters must match between the two ends of the pseudowire configurations? (Choose three.)

A. control word usage
B. MTU size
C. pseudowire ID
D. Xconnect group name
E. EFP subinterface number

Answer: A, B, C

Explanation:
Provisioning an AToM Static Pseudowire
In this configuration task, you use options in the xconnect Ethernet interface configuration command to specify a static connection, and mpls commands in xconnect mode to statically set the following pseudowire parameters:
•Set the local and remote pseudowire labels
•Enable or disable sending the MPLS control word

Haven’t been able to find where MTU Must match

Question: 22

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

A. PW ID
B. Frame Relay FECN, BECN, and DE bits
C. encapsulation type
D. VC type

Answer: B

Explanation:
http://www.cisco.com/en/US/products/ps6603/products_qanda_item09186a008009d4e3.shtml#wp39173
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.

Question: 23

Which VPN technology uses the Group Domain of Interpretation as the keying protocol and IPsec for encryption that is often deployed over a private MPLS core network?

A. DMVPN
B. GET VPN
C. SSL VPN
D. L2TPv3

Answer: B

Explanation:
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6586/ps6635/ps7180/deployment_guide_c07_554713.html

Question: 24

What is the primary difference between 6PE and 6VPE?

A. 6VPE does not require an MPLS core.
B. 6VPE requires an IPv6-aware core.
C. 6VPE provides IPv6 VPN services.
D. 6VPE tunnels IPv6 packets inside IPv4 packets.

Answer: C

Explanation:
6PE is for transporting ipv6 natively and 6VPE is for ipv6 mpls vpns

Question: 25

Refer to the Cisco IOS XR router output exhibit,

which method is being used to transport IPv6 traffic over the service provider network?

A. 6PE
B. 6VPE
C. native IPv6
D. native IPv4
E. dual stack

Answer: B

Explanation:
NOT SURE THIS MATCHES ANSWER

Question: 26

Which flavor of MPLS Layer 3 VPN has MPLS enabled on PE-CE links?

A. basic
B. CSC
C. inter-AS
D. AToM
E. VPLS

Answer: B

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