400-201 Guide

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  • Exam Number/Code 400-201
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All About 400-201 exam answers Sep 2017

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Q51. What are three actions that the control word performs in 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 

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

Q52. An IS-IS enabled router with multiple IS-IS neighbors is required to have BFD sessions with all neighbors. Which BFD mode should you use when you want to save the overhead of periodic protocol control packets? 

A. echo 

B. asynchronous 

C. demand 

D. active 


Explanation: https://tools.ietf.org/html/rfc5880#section-3.1 RFC - 5880 

Q53. Refer to the exhibit. 

ISP-X customers must be able to reach both ISP-Y and ISP-Z, but ISP-X must not allow transit traffic between ISP-Y and ISP-Z at any time Which two options satisfy this requirement? (Choose two.) 

A. Use the MED to prefer the proper routes 

B. Use communities to identify and filter routes. 

C. Use local preference to prefer the routes 

D. Use a route map to filter routes on the AS number. 

E. Use the atomic aggregate attribute 

Answer: B,D 

Q54. Refer to the exhibit. Router RT1 has three equal-cost paths back to the source. Which configuration should be applied in order to load-balance the multicast traffic across all three links. 

A. Create three static multicast routes where each pointing out to one or three interfaces. 

B. Enable PIM multipath. 

C. Create a tunnel interface between RT1 and RT2. Enable PIM on the interface tunnel and disable PIM on the three interfaces part of equal-cost path between RT1 and RT2. 

D. PIM load balance is not possible. PIM only chooses one interface for RFC check and prunes the other interfaces. 



Reference: http://www.cisco.com/c/en/us/support/docs/ip/ip-multicast/16450-mcastguide0.html 

Q55. In which three ways do PE routers manage multiple customers in MPLS VRF environments? (Choose three.) 

A. Route targets are configured that allow the PE to uniquely identify the customer routes in MP-BGP 

B. PE routers use route distinguishers to tag routes for importing and exporting into customer VRFs. 

C. PE routers use PE-CE routing protocols to manage routing with client VRF devices. 

D. PE routers use route targets to tag routes for importing and exporting into customer VRFs. 

E. Route distinguishes are configured that allow the PE to uniquely identify the customer routes in MP-BGP. 

F. PE routers use PE-PE routing protocols to manage routing with client VRF devices. 

Answer: C,D,E 

Q56. Refer to the exhibit. 

A service provider has multiple time sources in the environment for NTP. The time source at is intended to be seen as a primary time source. What command can be issued on PE4 to fix the configuration, ensuring the proper NTP source will be issued? 

A. ntp peer 

B. ntp peer prefer 

C. ntp server source GigabitEthernet0/0 

D. ntp server prefer 


Explanation: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/system_management/configuration/guide/sm_nx_os_cg/sm_3ntp.html#wp1106725 

Q57. 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 

Q58. 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) 



1.4. SP high end product 

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

Q59. 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. 


Q60. Refer to the exhibit. The referenced TE tunnels compete for bandwidth requirements over the limited available bandwidth that is provisioned. Which core MPLS component erases a conflict and provides admission control for any new added TE tunnel? 

A. link management 

B. link attributes 

C. MPLS TE priorities 



Explanation: http://www.cisco.com/c/en/us/td/docs/switches/datacenter/sw/5_x/nx-os/mpls/configuration/guide/mpls_cg/mp_te_RSVP.pdf 

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