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Q41. What are the four key design requirements for mobile IP backhaul? (Choose four.)
A. X2 interface turning point
B. bandwidth
C. Layer 2 Tunneling
D. native IPv6 support
E. DiffServQoS
F. MPLS-enabled interface
G. network timing distribution and recovery
H. mandatory Layer 3 access up to a cell site
Answer: C,D,G,H
Explanation: http://www.cisco.com/web/about/ac123/ac147/archived_issues/ipj_14-3/143_backhaul.html
Q42. DRAG DROP
Refer to the exhibit.
PE1 and PE2 has a Layer 2 VPN over a GRE tunnel. This GRE tunnel built between P1 and P2 has LDP enabled. Consider a packet capture of the packets from CE1 and CE2 at P1 and R1 link. Drag the headers on the left and drop them on the right in the order of the encapsulation, starting from the inner header (at the top) to the outer header (at the bottom).
Answer:
Q43. Two Tier 2 Service Providers are using a Tier 1 Service Provider for transport. MPLS is required between the Tier 2 Service Providers for label switching. In this CSC solution, which label stack is correct?
A. original IP packet, MPLS CSC transport label, MPLS VPN label, and MPLS Tier 2 transport label
B. original IP packet, MPLS Tier 2 transport label, MPLS VPN label, and MPLS CSC transport label
C. original IP packet, MPLS VPN label, MPLS Tier 2 transport label, and MPLS CSC transport label
D. original IP packet, MPLS Tier 2 transport label, MPLS CSC transport label, and MPLS VPN label
Answer: C
Q44. MPLS Service Providers use Route Distinguishers and Route Targets as methods to control routing for customer VRFs. Which two statements are true about Route Distinguishers and Route Targets? (Choose two.)
A. Route Targets are values that are used by a PE router to uniquely identify a VRF within its local MP-BGP VPNv4 table.
B. Route Distinguishers are used by PE routers by exporting and importing routes into a local VRF.
C. Route Targets are used by PE routers to define how to import and export prefixes into a local VRF database.
D. Route Targets are extended communities that are used by MP-BGP to identify routes as they are advertised to neighbor PE routers.
E. Route Distinguishers are values that are used by a PE router to uniquely identify a VRF within its local MP-BGP VPNv4 table.
Answer: C,E
Q45. Customers connecting to a Service Provider for Internet access are intending to implement redundant peering. The design requirements call for preferring a primary link for both ingress and egress traffic. Secondary links should be used only during primary outages. What two BGP deployment options will accomplish this design goal? (Choose two.)
A. On the router handling the secondary link, advertise routes with a MED value of 0.
B. On the router handling the primary link, set the weight for all incoming routes to be a value of 0.
C. On the router handling the secondary link, advertise all routes with a longer AS-PATH value.
D. On the router handling the primary link, advertise all routes with a longer AS-PATH value.
E. On the router handling the secondary link, set the local preference for all incoming routes to be a value of 0.
Answer: C,E
Q46. Refer to exhibit. NAT64 stateless configuration has been applied on RT1 router. The NAT64 prefix stateless used on this scenario is 2001:DB8:2::/96. ‘Host IPv4 only’ needs to test the connectivity with ‘Host IPv6 only’ using a ping command. Which is the correct ping command ‘Host IPv4 only’ should use?
A. ping 27.1.1.10
B. ping 27.1.1.10 source 2001:db8:2::7001:10A
C. ping 2001:db8:2::7001:10A
D. ping 2001:db8:2::112.1.1.10
E. ping 2001:db8:2::27.1.1.10
F. ping 2001:db8:2::1B01:10A
Answer: A
Q47. An engineer is working to provide high availability to a Service Provider core network. Which BGP command enables a backup path to be installed in the RIB and CEF tables?
A. maximum-paths ibgp
B. bgp additional-paths install
C. maximum-paths eibgp
D. bgp additional-paths select
E. bgp advertise-best-external
Answer: B
Explanation: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_bgp/configuration/xe-3s/irg-xe-3s-book/bgp_best_external.html#GUID-66F31B75-B1E6-4B38-9B4D-6A89839930CE
Q48. The product team at an ISP that offers VoIP services wants to add two-way video conferencing to their product offering. Which three QoS methods can be applied for real-time traffic on WAN links with speeds that are slower than 768 Kbps? (Choose three.)
A. Apply voice-adaptive fragmentation to ensure that large video packets are fragmented and interleaved.
B. Apply LLQ with video traffic that is dedicated in the priority queue.
C. Apply MLP link fragmentation and interleaving to the interface.
D. Apply CBWFQ with video traffic in its own class, which is marked with a PHB value of AF41.
E. Apply CBWFQ with VoIP traffic in its own class, which is marked with a PHB value of EF.
F. Apply LLQ with both voice traffic and video traffic in the same priority queue
Answer: C,D,E
Q49. Which MPLS technology will achieve LAN extensions over the service provider backbone?
A. AToM
B. VPLS
C. L2VPN
D. L2TPv3
Answer: B
Explanation: https://tools.ietf.org/html/rfc7041
Q50. Refer to the exhibit.
A network engineer is troubleshooting PTP on Cisco ASR 9000 router. What can be concluded about the interface based on output provided?
A. The interface receives timestamps from a master clock, but the router's clock is not yet synchronized to the master.
B. The interface is aware of a better clock than the one it would advertise if it was in Master state.
C. The interface is not yet ready to participate on PTP.
D. The interface is about to go into Master state.
Answer: A