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2021 Apr 400-201 test question

Q1. Refer to the exhibit. Two MPLS TE tunnels are configured with a total bandwidth guarantee of 100 Mbps. However, Tunnel 1 has a requirement to have one-fifth of this total bandwidth. Which two configurations accomplish this goal? (Choose two.) 

A. Configure tunnel mpls traffic-eng bandwidth 20000 under the Tunnel 1 interface. 

B. Configure bandwidth 20000 under the Tunnel 1 interface. 

C. Configure tunnel mpls traffic-eng bandwidth 80000 under the Tunnel 2 interface. 

D. Configure bandwidth 80 Mbps under physical interfaces in the path PE1-P2-PE2. 

E. Configure bandwidth 20 Mbps under physical interfaces in the path PE1-P1-PE2 

F. Configure bandwidth 80000 under the Tunnel 2 interface. 

Answer: A,C 

Explanation: See Configuration Guide 


Q2. Refer to the exhibit . 

A network engineer is troubleshooting a packet over SONET connection between Router A and Router B. What is causing the line protocol to be down? 

A. The keepalive must be set on both sides 

B. The POS CRC must be set on both sides. 

C. There is an encapsulation mismatch 

D. There is an MTU mismatch. 

Answer:


Q3. 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:


Q4. In a PE-CE scenario using OSPF as the routing protocol, a down-bit set can be advertised in which OSPF LSA type? 

A. type 1 LSA 

B. type 2 LSA 

C. type 3 LSA 

D. type 5 LSA 

E. type 7 LSA 

Answer:


Q5. 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:


Most recent 400-201 actual exam:

Q6. Refer to the exhibit. A network engineer must configure BFD for IS-IS between R1 and R2. In case the primary link fails, the convergence time should be less than a second. 

Which two IOS commands are required to meet this requirement? (Choose two.) 

A. isis bfd 

B. bfd minimum-interval 250 

C. bfd interval 250 min_rx 250 multiplier 3 

D. bfd multiplier 3 

E. bfd interval 250 min_rx 250 multiplier 4 

F. bfd fast-detect ipv4 

Answer: C,F 

Explanation: http://www.cisco.com/c/en/us/td/docs/routers/xr12000/software/xr12k_r4-3/routing/command/reference/b_routing_cr43xxr12k/b_routing_cr43xxr12k_chapter_010.ht ml#wp3058619742 


Q7. Which Cisco IOS XR Virtualization technology provides full isolation between virtualized routing instances for extra control plane resources? 

A. HVR 

B. SVR 

C. SDR 

D. DRP 

Answer:

Explanation: 

http://www.cisco.com/en/US/solutions/collateral/ns341/ns524/ns562/ns573/white_paper_c11-512753_ns573_Networking_Solutions_White_Paper.html 


Q8. The following congestion avoidance configuration has been applied on an outgoing interface: 

Which is the result of the egress packets marked as DSCP AF32 when the average queue depth is 40? 

A. It will be dropped with a random rate less than the one defined by MPD. 

B. It will be tail dropped. 

C. It will be dropped with a rate of 1 packet out of 30. 

D. It will be dropped with a rate of 1 packet out of 20. 

Answer:


Q9. An engineer is troubleshooting L3VPN traffic loss over the MPLS-enabled core network when new core links were enabled. Assuming that the IGP is properly configured, which issue causes a temporary data flow blackholing when the IGP and LDP reconvenes? 

A. LDP is a Layer 2 protocol forwarding label packets before the IGP reconvened. 

B. IP packets are forwarded as soon as routes are learned over a new IGP adjacency before the label exchange happens over the new links 

C. MP-BGP sessions between PE and RR routers require extra time to reconverge than the underlying IGP. 

D. MPLS-TE tunnels without LDP adjacencies are used over the new links black-holing the traffic before the LDP label exchange is completed 

Answer:


Q10. 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:

Explanation: 

http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_data_sheet09186a008 052edd3.html