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Q1. Refer to the exhibit.
IS-IS configuration has been deployed using the default IS-IS metric value and default IS-IS metric-style. The SP decides to implement MPLS TE in all routers, except R5. In order to maintain IS-IS adjacency between R3 and R5 without impacting reachability, which command should be configured on R3 router under the IS-IS process?
A. metric-style narrow
B. metric-style wide
C. metric-style narrow transition
D. metric-style transition
Answer: D
Q2. Which OSPF configuration suppresses the periodic OSPF hello packets?
A. router ospf 1
area0
interface GigabitEthernet 0/1
passive
B. router ospf 1
area0
interface GigabitEthernet 0/1
C. router ospf 1
area 0
interface GigabitEthernet 0/1
stub-router
router-lsa r-bit
D. router ospf 1
area 0
interface GigabitEthernet 0/1
demand-circuit
point-to-point
Answer: D
Q3. Refer to the exhibit.
All routers have OSPF adjacency with the directly connected routers, yet RC cannot receive OSPF updates from Area 0 To fix this issue, which configuration should be applied?
A. On RD router
router ospf 1
area 1 virtual-link 3.3.3.3
On RB router:
router ospf 1
area 1 virtual-link 4.4.4.4
B. On RC router.
router ospf 1
area 2 virtual-link 3.3.3.3
On RB router:
router ospf 1
area 2 virtual-link 2.2.2.2
C. On RC router
router ospf 1
area 0 virtual-link 1.1.1.1
On RA router:
router ospf 1
area 2 virtual-link 2.2.2.2
D. On RD router:
router ospf 1.
area 1 virtual-link 1.1.1.1
On RA router:
router ospf 1 areal virtual-link 4.4.4.4
Answer: A
Q4. An engineer is tasked with configuring Lawful-Intercept on the Internet facing routers. Which two security issues must the engineer take into consideration? (Choose two)
A. Default SNMP does not include all the MIB references needed to respond to the request.
B. A new and dedicated loopback interface is required to communicate with the MD device.
C. Encryption might be required depending on the request.
D. The communication between the MD and the Content IAP happens over UDP port 161.
E. QoS and CoPP should be implemented to protect and optimize the tasks.
F. SNMFV2c should be enabled in order to provide the correct message format.
Answer: A,D
Q5. Which OSPF feature allows the router to recompute SPF changes for only the affected part of the SPT?
A. PRC
B. fast hellos
C. BFD across the entire backbone area
D. incremental SPF
Answer: D
Q6. Refer to the exhibit. The Service Provider does not have IPv6 support in the core, however it does have MPLS support. Customer requires IPv6 connectivity in all sites including Internet access. Without a requirement to create VRF, which method is preferred to support IPv6 traffic between these sites?
A. 6VPE
B. H-VPLS
C. L2TPv3
D. VPLS
E. 6CE
F. 6PE
Answer: F
Explanation:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_data_sheet09186a008 052edd3.html
Q7. 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
Q8. An engineer is troubleshooting Precision Time Protocol on Cisco ASR 9000 router and noticed the protocol is running in a Multicast mode. Which two results regarding the messages can the engineer expect? (Choose two)
A. IPTP messages that use unicast messages and those that use multicast messages must be specified.
B. Announce and Sync messages are sent as multicast messages.
C. Signaling. Delay-Request and Delay-Response messages are sent as multicast messages
D. All messages for PTP will be sent as multicast messages
E. Announce and Sync messages are sent as unicast messages
F. Signaling, Delay-Request, and Delay-Response messages are sent as unicast messages
Answer: B,F
Q9. A service provider is using multicast flows to provide streaming video content to its customers. Video streams are sometimes interrupted, and network instability is determined to be the cause. Which action should the service provider take to decrease the burden on the router resources in an unstable unicast routing environment?
A. Reduce the volume of query messages.
B. Tune the RPF backoff.
C. i Increase the PIM hello hold timers.
D. Filter unnecessary SA messages.
Answer: B
Q10. Based on the following configuration:
Which two statements about multicast VPN configuration are true? (Choose two.)
A. The multicast tree is created based only on the existence of active sources or receivers behind PEs in the ABC VRF.
B. The service provider core network is required to support SSM.
C. Multicast needs to be enabled only on ABC VRF and is tunneled to participating PE routers in the ABC VRF.
D. The SP core network is required in order to enable the BGP Multicast Address Family on all peering.
E. Multicast is required for the core network in addition to the ABC VRF.
F. The multicast tree exists regardless of whether there are any active sources or receivers in the ABC VRF.
Answer: E,F
Explanation: http://www.ciscopress.com/articles/article.asp?p=32100&seqNum=4
http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00800a3db6.sht ml
Q11. Refer to the exhibit.
MPLS VPN service has been provisioned for a customer by using inter-AS MPLS Option C. It is possible to redistribute ISP1 and ISP2 received loopback addresses into the local IGP. How many labels are associated with packet forwarding between the ASBRs?
A. 0
B. 1
C. 2
D. 3
E. 4
Answer: C
Q12. 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
Q13. 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: A
Q14. Refer to the exhibit.
A service provider is using the configuration to determine traffic paths based on MPLS EXP markings. Which technology is being implemented?
A. MPLS TE FRR
B. CBTS
C. IP FRR
D. MPLS TE
E. PBTS
F. DS-TE
Answer: B
Q15. 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