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2021 Nov 400-201 cisco service provider:

Q21. 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 

Q22. 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: A 

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 

Q23. Which two flexible service mapping features that are used on the ES40 line card can classify traffic into different service instances, in order to consume fewer VLANs? (Choose two.) 

A. CoS 

B. DSCP 

C. IP precedence 

D. MPLS experimental bit 

E. ToS 

F. EtherType 

Answer: A,F 

Explanation: 

Reference: http://www.cisco.com/c/en/us/td/docs/routers/7600/install_config/ES40_config_guide/es40_ sw_config/es40_chap7.html#pgfId-1500091 

Q24. 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: A 

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/ 

Q25. 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 

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

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Q26. An engineer needs to implement changes to Router_A during a maintenance window. The engineer first saves the running-configuration of all routers to the local disk0, then applies the required configuration changes. However, during post checks, the engineer realizes the implementation was deployed on Router_B instead. 

Which command should the engineer apply to reverse the changes made during the maintenance window? 

A. configure revert disk0:myconfig-1 

B. configure reload ditk0:myconfig-1 

C. configure copy disk0:myconfig-1 

D. configure replace disk0:myconfig-1 

Answer: D 

Explanation: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/config-mgmt/configuration/15-sy/config-mgmt-15-sy-book/cm-config-rollback-confirmed-change.html 

Q27. What is the minimum hardware configuration of the multishelf Cisco CRS-1 system? 

A. One route processor (RP) card and one modular services card (MSC) 

B. One distributed route processor (DRP) and one S13 fabric card (SFC) 

C. One line card chassis (LCC) and one fabric card chassis (FCC) 

D. One route processor (RP) and one fabric card chassis (FCC) 

E. One line card chassis (LCC) and one S13 fabric card (SFC) 

Answer: C 

Explanation: 

1.4. SP high end product 

A minimum of one LCC and one FCC are required to configure a multishelf system. 

Q28. Refer to the exhibit. 

ABC and XY2 MPLS VPN customers require Internet access. An ISP engineer deployed the solution on PE1 device. Which statement about CEs connectivity to Internet is true? 

A. Only CE-XYZ will have connectivity 

B. Neither CE will have connectivity, as IAR does not have route back to the subnet used on NAT configuration. 

C. Both CEs will have connectivity. 

D. Only CE-ABC will have connectivity. 

E. Neither CE will have connectivity, as both CEs are using the same subnet used on NAT configuration. 

Answer: D 

Q29. 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: A 

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

Q30. An engineer wants to configure MPLS TE Fast Reroute with link protection on five routers. Which methodology can reduce configuration on the point of the local repair router and successfully complete the task? 

A. Configure a backup tunnel on the PLR. 

B. Enable the autotunnel backup feature. 

C. Configure a backup tunnel on the tunnel head end router. 

D. Enable the autotunnel primary feature. 

Answer: B 

Explanation: http://www.cisco.com/c/en/us/td/docs/routers/crs/software/crs_r4-2/mpls/configuration/guide/b_mpls_cg42crs/b_mpls_cg42crs_chapter_0100.html#concept_ F19BEEEFC831436AAC9291A87F9B34E5