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Q71. Which is the main goal of BGPsec regards to improve BGP security? 

A. Reduces risk of improper route propagation from unauthorized AS numbers 

B. Configures BGP route verification by storing routes in a database used to validate AS numbers 

C. Adds encryption to route propagation outside the iBGP AS 

D. Increases legitimacy and authenticity of BGP advertisements 

Answer:

Explanation: Reference: https://tools.ietf.org/html/draft-lepinski-bgpsec-overview-00 


Q72. Which network interface technology eliminates the need for an external transponder at service provider sites? 

A. IPoDWDM 

B. CWDM 

C. SONET 

D. SDH 

Answer:


Q73. 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:


Q74. Refer to the exhibit. After the BGP TCP negotiation between RouterA and RouterB, what will be the value of the keep alive timer and the hold-down timer, respectively? 

A. 3 seconds and 9 seconds 

B. 60 seconds and 180 seconds 

C. 10 seconds and 9 seconds 

D. no value, because BGP negotiation will not be successful 

E. 10 seconds and 10 seconds 

F. 10 seconds and 30 seconds 

G. 3 seconds and 30 seconds 

H. 3 seconds and 10 seconds 

Answer:


Q75. Refer to the exhibit. R3 cannot install a route to R1-R2 subnet 2001:1:155:12::/64. Which action resolves this issue? 

A. Add the redistribute ospf 1 include-connected command under the ipv6 router eigrp 10 process. 

B. For the OSPF process, add the no shutdown command. 

C. For prefix-list OSPF_INTO_EIGRP seq 20, replace the prefix with 2001:155:1:12::/64. 

D. For route-map OSPF_INTO_EIGRP, add the set metric 1000 1 255 1 1500 command. 

Answer:

Explanation: http://www.ciscopress.com/articles/article.asp?p=2273507&seqNum=8 

https://supportforums.cisco.com/document/12110191/understand-include-connected-keyword-use-ipv6-redistribution 


Q76. Refer to the exhibit. What is the correct action to fix the L2TPv3 configuration? 

A. At Router-A, correct the local interface in the pseudowire configuration. 

B. At Router-B, correct the encapsulation in the pseudowire configuration. 

C. At Router-A, correct the encapsulation in the pseudowire configuration. 

D. At Router-B, correct the local interface in the pseudowire configuration. 

Answer:

Explanation: 

http://www.cisco.com/c/en/us/td/docs/ios/12_0s/feature/guide/l2tpv30s.html#wp1046765 


Q77. 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:


Q78. 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 


Q79. Which are the three header fields that affect how Equal-Cost Multipath hashes traffic flow into interface groups? (Choose three.) 

A. source MAC address 

B. source port 

C. source IP address 

D. destination IP address 

E. IP protocol ID 

F. destination MAC address 

Answer: B,C,D 

Explanation: https://supportforums.cisco.com/document/111291/asr9000xr-loadbalancing-architecture-and-characteristics#field 


Q80. In an MPLS VPN environment, the QoS marking over the MPLS backbone must be different from the one that is received from the customer. The forwarding on the egress PE is based on the marking that is set by the ingress PE. Which null label and QoS mode can achieve this? 

A. MPLS explicit null with pipe mode 

B. MPLS implicit null with short pipe mode 

C. MPLS implicit null with uniform mode 

D. MPLS explicit null with uniform mode 

E. MPLS explicit null with short pipe mode 

F. MPLS implicit null with pipe mode 

Answer:

Explanation: 

http://www.cisco.com/en/US/tech/tk828/technologies_q_and_a_item09186a00800a43f5.sht ml#wp27379 

http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_diffserv/configuration/15-mt/mp-te-diffserv-15-mt-book/mp-diffserv-tun-mode.pdf 

https://ccdewiki.wordpress.com/2013/05/31/three-qos-models-in-mpls/