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Q1. Which two statements about 10 Gigabit Ethernet WAN PHY mode are true? (Choose two.) 

A. The signal maps to an OC-192c/STM-64c payload. 

B. The nominal speed is 9.95328 Gbps. 

C. It is compatible with Packet Ethernet over SONET. 

D. The signal maps to an OC-768c/STM-256c payload. 

E. It is compatible with Packet over SONET. 

F. The nominal speed is 10.3125 Gbps. 

Answer: A,B 

Explanation: https://en.wikipedia.org/wiki/10_Gigabit_Ethernet 

Q2. 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:  

Q3. 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 

Q4. Refer to the exhibit. The Service Provider is deploying Internet service to its VRF customers by using vrf INTERNET. A dedicated firewall provides NAT functionally towards the Internet. Assume that IP address overlapping between VRFs is not an issue. 

Which three configuration steps are required to add Internet service to the VRF customers? (Choose three.) 

A. Export the RD of vrf INTERNET from all customer VRFs. 

B. Originate a default route on PE4 in vrf INTERNET. 

C. Import the RD from vrf INTERNET in all customer VRFs. 

D. Originate a default route on the firewall in vrf INTERNET. 

E. Import the VRF “INTERNET” Route Target in all customer VRFs. 

F. Import the Route Target of all customer VRFs in vrf INTERNET. 

G. Leak all VRF routes to the global routing table. 

Answer: B,C,G 

Q5. 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: D 

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 

Q6. 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 

Q7. 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 

Q8. Which are the four main functions of the Cisco IOS XR System Manager? (Choose four) 

A. performs system monitoring 

B. is the main IOS XR component for device drivers and software installation management 

C. starts, restarts, and terminates processes in response to user configuration or RP failover 

D. is responsible for the message-passing "bus" for interprocess communication 

E. acts as a central repository for all process-related information 

F. performs health checks 

G. initiates disaster recovery based on the process health 

H. invokes a dumper to collect a core dump when a process terminates abnormally 

Answer: C,E,G,H 

Q9. What is the PPMP label used for? 

A. for the ingress replication model with BIDIR-PIM in an overlay model 

B. only for the inter-AS mVPN models that use mLDP 

C. for the partitioned mVPN model with PIM signaling in an overlay model 

D. only for unicast over MPLS VPN 

E. for all the default MDT and mVPN models 

Answer: D 

Explanation: http://lostintransit.se/tag/bgp/ 

https://tools.ietf.org/html/draft-rosen-l3vpn-mvpn-mspmsi-08#section-3.2.2.1 

Q10. An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enabled. Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconvenes? 

A. LDP is a Layer 2 protocol forwarding label packets before the IGP reconvened. 

B. IP packets are forwarded as soon as routes are learned over a new IGP adjacency before the label exchange happens over the new links 

C. MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP. 

D. MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed 

Answer: B