NO.1 For MPLS inter-AS Option B, how many labels are associated with packet forwarding between
the VPNv4 ASBR neighbors?
A. 0
B. 1
C. 2
D. 3
Answer: D

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Explanation:
http://www.cisco.com/c/en/us/td/docs/iosxml/ios/iproute_bgp/configuration/xe-3s/irg-xe-
3sbook/bgp_nsr_support_for_mpls_vpnv4_and_vpnv6_inter-as_option_b.pdf

NO.2 What are three actions that the control word performsin MPLS AToM? (Choose three.)
A. is used to identify the VC label
B. is used for padding small packets
C. preserves the sequence of the transported frames
D. facilitates the load balancing of AToM packets in the MPLS backbone network
E. carries control bits of the Layer 3 header of the transported protocol
F. is used to identify the tunnel label
Answer: B,C,D

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Explanation:
https://ccdewiki.wordpress.com/2013/05/28/control-word-on-atom/

NO.3 A Service Provider wants to extend MPLS WAN endpoints in the cloud at the edge of a customer
network within the cloud.Which platform will meet this requirement?
A. Cisco NX-OS
B. Cisco CSR1000v
C. Cisco ISR Routers running IOS
D. Cisco CRS-1
E. Cisco ASR Routers running IOS-XR
Answer: B

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Explanation:
http://www.cisco.com/c/en/us/products/collateral/routers/cloud-services-router-1000v-
series/datasheet-c78-733443.html

NO.4 An engineer is deploying RTBH. What is necessary routing constraint required for successful
implementation?
A. The trigger device must have an iBGP session with all the clusters/route reflectors in the
autonomous system.
B. The trigger device must redistribute the static route pointing to a null interface into the IGP
process.
C. Theno ipreachablescommand must be issued on the PE router interface under attack.
D. The attacker's destination IP address must be routed to a null interface.
E. The eBGP sessions need to set the next-hop attribute value to the trigger device loopback
interface.
Answer: A

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Explanation:
Explanation :
http://www.cisco.com/web/about/security/intelligence/ipv6_rtbh.html

NO.5 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

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Explanation:
http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r43/mpls/configuration/guide/b_
mpls_cg43xcrs/b_mpls_cg43crs_chapter_01.html#task_1129 395

NO.6 Which is the RP address of the IPv6 multicast address FF76:0:130:1234:5678:9abc::4321?
A. 4321:5678:9abc::30
B. 4321:5678:9abc::13
C. 1234:5678:9abc::130
D. 1234:5678:9abc::1
E. 1234:5678:9abc::13
Answer: D

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Reference:http://www.netcraftsmen.com/wp-content/uploads/2014/12/20090429-CMU-
Introduction_to_IP_Multicast.pdfpage 53

NO.7 Refer to the exhibit.
Why is R3 unable to install 1.1.1.1/32 in its routing table?
A. 11.11.11.11/32 exists in the routing table, so the conditional advertising is not working.
B. The route is filtered out by theip prefix-list ROUTE-INcommand.
C. 11.11.11.11/32 is advertising in the BGP table, so conditional advertising is not working.
D. Thebgp redistribute-internalcommand is missing under the R2 BGP process.
Answer: B

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NO.8 Which two statements about forwarding equivalence class (FEC) are true? (Choose two)
A. FEC might correspond to a destination IP subnet, but it might alsocorrespond to any traffic
classthat the edge LSR considers significant.
B. FEC is a group of IP packets that is forwarded over a different path, but with the same
forwardingtreatment.
C. FEC is a group of IP packets that is forwarded over the same path, and with the same
forwardingtreatment.
D. FEC is a group of IP packets that is forwarded over a different path, but with the different
forwarding treatment.
E. FEC is a group of IP packets that is forwarded over the same path,but with a different
forwardingtreatment.
Answer: A,C

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