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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. 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 

Q3. Refer to the exhibit. Customer XYZ Site 1 is not learning prefixes from Site 2. What is the issue? 

A. MPLS LSP is broken along the path. 

B. The route-policy is not implemented in router PE-2. 

C. The BGP local-as command should be used between PE-1 and CE-1. 

D. The route-distinguisher values must match in both sites. 

E. The BGP as-override command should be implemented between PE-1 and CE-1. 

Answer:

Q4. 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 

Q5. Two Service Providers are beginning a merger between AS boundaries to provide MPLS-enabled services between their networks. Customers are using both Service Providers for services and, under certain circumstances; there are requirements to extend Layer 2 VPN circuits between each provider. The providers are in the process of completing the technical merger. However, the MPLS is not supported between the providers. Which action allows MPLS Layer 2 VPN circuits to be built over the inter-AS link? 

A. Create a GRE tunnel with the mpls ip command between ASBRs. 

B. Create Layer 2 VPN peerings between PE routers from each provider. 

C. Create a VPNv4 peering between ASBRs to advertise labels between each provider. 

D. Create a sham link between ASBR routers to enable a superbackbone peering for Layer 2 VPN signaling. 

Answer:

Explanation: https://ccdewiki.wordpress.com/2013/07/02/inter-as-l2vpn-mpls-solutions/ 

Q6. Refer to the exhibit. 

The vrf MAINT has been provisioned and used by the Service Provider management network. The engineer discovers that syslog messages are not being received on the syslog server. IP reachability has been validated using ping. Which issue in the configuration must be corrected? 

A. logging on must include the vrf MAINT keyword. 

B. logging host must include the vrf MAINT keyword. 

C. The logging facility must be configured for syslog processing. 

D. The route targets that are configured do not match the route distinguisher. 

Answer:

Explanation: 

http://www.cisco.com/c/en/us/td/docs/ios/12_2sr/12_2sra/feature/guide/srvrfslg.html#wp10 59076 

Q7. Due to recent acquisitions, a company’s MPLS infrastructure is growing very quickly. Concerns arise about labeling each and every IP address on the P router. Which command would significantly reduce the label allocations without compromising LDP functionalities? 

A. ip prefix-list List1 deny prefix/prefix_length 

mpls ldp label 

allocate global prefix-list List1 

B. mpls ldp label 

allocate global host-routes 

C. access-list 1 permit subnet wildcard 

mpls ldp neighbor neighbor_ip labels accept 3 

D. mpls ldp password required for 10 

access-list 10 permit host_ip_1 

access-list 10 permit host_ip_2 

access-list 10 permit host_ip_n 

Answer:

Q8. 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 

Q9. Cisco IOS XR has implemented a nonstop routing feature so that when RP failover occurs, the routing information can be recovered locally. Which protocol does not support the NSR feature? 

A. OSPF 

B. LDP 

C. BGP 

D. IS-IS 

E. RSVP 

Answer:

Q10. Users are complaining of intermittent high packet loss for seconds at a time. The engineer troubleshooting the issue finds that a TenGigE link is bouncing for milliseconds at a time, causing the traffic path to reconverge onto a congested FastEthernet link. What can the engineer do to prevent this service-affecting reconvergence only in the case of momentary link bounces until the link can be repaired? 

A. decrease the carrier-delay up on both sides of the link 

B. disable keepalives and BFD 

C. decrease the carrier-delay down on both sides of the link 

D. increase the carrier-delay up on both sides of the link 

E. increase the carrier-delay down on both sides of the link 

Answer:

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