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Q61. Which MPLS technology will achieve LAN extensions over the service provider backbone? 

A. AToM 

B. VPLS 

C. L2VPN 

D. L2TPv3 

Answer:

Explanation: https://tools.ietf.org/html/rfc7041 


Q62. What are two advantages of Cisco IOS XR Software over Cisco IOS Software? (Choose two.) 

A. a configuration that is grouped by interface 

B. a configuration that is grouped by process 

C. one-stage configuration 

D. a monolithic OS 

E. a two-stage configuration 

Answer: B,E 


Q63. An support engineer has been tasked to protect an ISP infrastructure from the growing number of encrypted DDoS attacks. The solution should also validate the eBGP peering. Which solution accomplishes these goals? 

A. BGP FlowSpec 

B. BTSH 

C. BGP Route Dampening 

D. BGP LS 

E. RTBH 

Answer:


Q64. Which BGP feature improves the convergence and response time to adjacency changes with BGP neighbors? 

A. reducing BGP scanner timing to the minimum that is supported 

B. BGP Multihop 

C. Next-Hop Address Tracking 

D. Fast Peering Session Deactivation 

E. TTL Security Check 

Answer:

Explanation: http://www.cisco.com/c/en/us/td/docs/ios/12_2sb/feature/guide/sbbnhop.html 


Q65. In a Layer 2 VPN service, which is the default behavior of an EVC-based platform with regards to VLAN manipulation? 

A. keeps the VLAN tag of the incoming frame 

B. attaches two VLAN tags to the incoming frame 

C. removes the VLAN tag from the incoming frame 

D. removes all the VLAN tags from the incoming frame 

E. sets the VLAN tag of the incoming frame 

Answer:

Explanation: http://www.cisco.com/c/en/us/support/docs/routers/asr-9000-series-aggregation-services-routers/116453-technote-ios-xr-l2vpn-00.html#anc7 


Q66. Which QoS method is available when GRE is used to provide MPLS VPN services over an IP-only core? 

A. matching MPLS EXP on the physical interface 

B. matching EXP on the tunnel interface 

C. matching DSCP on the physical interface 

D. matching DSCP on the tunnel interface 

Answer:


Q67. Refer to the exhibit. An SP core is running MPLS with OSPF as the IGP used for Loopback propagation. LDP Synchronization is enabled per the given configuration. What will the traffic flow behavior be after a temporary outage event on PE1 Eth0/0? 

A. Permanently through PE1 -> P2 -> PE4 due to lowest path metric. 

B. Initially through PE1 -> P1 -> PE4, then a few seconds later, it will be over PE1 -> P2 -> PE4. 

C. Permanently through PE1 -> P1 -> PE4 due to lowest path metric. 

D. Initially through PE1 -> P2 -> PE4, then a few seconds later, it will be over PE1 -> P1 -> PE4 

Answer:


Q68. Two routers that are running MPLS and LDP have multiple links that than connect them to each other. An engineer wants to ensure that the label bindings are not flushed from the LIB if one of the links fails. Which configuration meets this requirement? 

A. the mpls ldp neighbor targeted command 

B. the mpls ip command on a Cisco MPLS TE tunnel 

C. the mpls ldp discovery targeted-hello accept command 

D. the mpls ldp session protection command 

Answer:

Explanation: 

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/fssespro.html#wp1027177 

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_ldp/configuration/xe-3s/asr1000/mp-ldp-xe-3s-asr1000-book/mp-ldp-sessn-prot.html#GUID-FA0EF183-FA7C-488A-85C1-82BFEB91DCA7 


Q69. When troubleshooting a DoS attack, a support engineer finds a huge number of packets that are destined to one of the core routers interface IP address. By the time the packets reach this core router, they have a TTL of 0. Based on Cisco platform running IOS 15.3S, which technique is most effective in resolving this problem 

A. Configure LPTS. 

B. Configure an ACL on the core router interface. 

C. Configure CoPP on the core router. 

D. Configure policing on PE routers. 

E. Configure a receive ACL on the core router. 

Answer:


Q70. Which technology is a forwarding decision point in a PE router that provides flexibility to make many Layer 2 flow decisions within an interface? 

A. local connect 

B. AToM 

C. VPLS 

D. pseudowire 

E. EFP 

Answer: