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Q11. In order to prevent malicious traffic flows, how does BGPsec protect prefix advertisements? 

A. It validates only the originating AS. 

B. It validates routes with encryption. 

C. It validates the AS path. 

D. It validates the next-hop AS. 

Answer: C 


Q12. Which are the three benefits of using the Yang model? (Choose three.) 

A. Reduce lab footprint 

B. Improve access to resources 

C. Support interoperability that provides a standard way to model management data 

D. Support simplified network management applications 

E. Provide a scale virtual lab environment 

F. Support programmatic interfaces 

Answer: C,D,F 

Explanation: https://tools.ietf.org/html/rfc6020#page-11 


Q13. Refer to the exhibit. An MPLS Layer 3 VPN service has been provisioned for a customer. What will be the ToS value at Site-B for the exceeded traffic that it is sent from Site-A with ToS 2? 

A. 0 

B. 2 

C. 3 

D. 4 

E. No exceeded traffic will reach Site-B. 

Answer: E 


Q14. Refer the exhibit. Two Autonomous Systems are enabled to support multicast. An engineer wants to set up configuration so that a multicast client at AS 100 can receive multicast traffic from the M-Server at AS 200. However, the RP announcements must be limited within each autonomous system site. Which Cisco IOS configuration achieves this goal? 

A. On both ASBRs Eth0/0 and the no ip pim sparse-mode command. 

B. On both ASBRs add the ip pim send-rp-discovery scope 1 command. 

C. On both RPs add the ip pim send-rp-discovery scope 2 command. 

D. On both ASBRs Eth0/0 add the ip pim bsr-border command. 

E. On both ASBRs Eth0/0 add the ip pim dense-mode command. 

F. On both RPs add the ip pim bsr-border command. 

Answer: D 

Explanation: 

http://www.cisco.com/c/en/us/td/docs/ios/12_2/ipmulti/command/reference/fiprmc_r/1rfmult2.html#wp1050039 It filters the BSR message: http://tools.ietf.org/html/rfc5059#section-4.1 


Q15. Which QoS DiffServ mode preserves the original customer IP marking besides of on egress PE router uses the DSCP value of this IP packet on outbound queuing? 

A. MPLS PHB mode 

B. Pipe mode 

C. IntServ mode 

D. Uniform mode 

E. Short-Pipe mode 

Answer: E 


Q16. QoS is applied on an outgoing interface as shown below: 

What will the QoS result be for egress traffic with an average queue depth of 40 that is marked as DSCP AF32? 

A. Traffic will be dropped with a random rate less than the one defined by MPD. 

B. All traffic will be tail dropped. 

C. Traffic will be dropped with a rate of 1 packet out of 20. 

D. Traffic will be dropped with a rate of 1 packet out of 30. 

Answer: C 


Q17. A network engineer is responsible for implementing a solution with Cisco IOS XR Software that insures continuous forwarding during a control plane failure. Which two technologies should the engineer consider? (Choose two.) 

A. TE FRR 

B. IP FRR 

C. graceful restart 

D. BFD 

E. NSR 

Answer: C,E 

Explanation: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-3/mpls/configuration/guide/b_mpls_cg43xcrs/b_mpls_cg43crs_chapter_01.html#task_1129 


Q18. Refer to the exhibit. Which statement is true? 

A. This is an inter autonomous unicast route. 

B. The BGP MED value is 26. 

C. This is an mVPN route. 

D. The route target value is 10.1.100.2:3. 

E. There is a route reflector in this network. 

F. The route did not import this route into the VRF one. 

Answer: E 


Q19. Which are the two purposes of the MPLS label value 1? (Choose two.) 

A. it is used for MPLS OAM packets. 

B. it indicates an implicit null label. 

C. it is used for VPNv6 packets. 

D. it is used to carry the QoS value in the label stack. 

E. it indicates an explicit null label. 

F. it indicates a router alert label. 

Answer: C,F 

Explanation: http://www.cisco.com/c/en/us/support/docs/multiprotocol-label-switching-mpls/mpls/4649-mpls-faq-4649.html#qa3 

http://www.iana.org/assignments/mpls-label-values/mpls-label-values.xhtml 

IPv4 Explicit NULL Label ----> 0 

Router Alert Label ----> 1 

IPv6 Explicit NULL Label -----> 2 

Implicit NULL Label -----> 3 

OAM Alert Labe -----> 14 


Q20. Refer to the exhibit. In the short-pipe QoS mode, this customer has QoS control for which two links? (Choose two.) 

A. a 

B. c 

C. d 

D. b 

E. e 

Answer: A,E