Shortcuts To 400-201(1 to 10)

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Q1. 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. The no ip reachables command 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. 


Explanation: Old Dumps Actual Test pg no.52 (520 Q) 

Q2. Which two statements about 10 Gigabit Ethernet WAN PHY mode are true? (Choose two.) 

A. The signal maps to an OC-192c/STM-64c payload. 

B. The nominal speed is 9.95328 Gbps. 

C. It is compatible with Packet Ethernet over SONET. 

D. The signal maps to an OC-768c/STM-256c payload. 

E. It is compatible with Packet over SONET. 

F. The nominal speed is 10.3125 Gbps. 

Answer: A,B 


Q3. An engineer must implement E-Line services for a service provider network. Which two services apply in this situation? (Choose two.) 


B. E-Tree 




Answer: A,E 


Q4. 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. 



Q5. Refer to the exhibit. 

Why does R1 not receive a label for prefix? 

A. R1 does not have an established LDP neighborship with the router announcing the prefix. 

B. The prefix is being null-routed in the downstream neighbor 

C. LDP peer is not configured to advertise a label for the prefix 

D. BGP is not configured to exchange labels with the BGP peer advertising 10.0.0 3/32 prefix 


Q6. Refer to the exhibit. 

It displays the Router_3 FIB information without any OSPF LSDB optimization. An engineer wants to optimize the OSPF LSDB in accordance with RFC 1587 Considering the following restraints: 

.Router_3 maintains full connectivity 

.Router_2 requires the least configuration 

In order to achieve the OSPF LSDB optimization on Router_3. which Cisco IOS command should the engineer use on Router_2? 

A. area 1 nssa default-information-originate 

B. area n nssa no-summary 

area 1 nssa no-redistribution 

C. area 1 nssa no-redistribution 

area 1 nssa default-information-originate 

D. area 1 nssa no-summary 

E. area 1 nssa no-redistribution 

F. area 1 nssa no-summary 

area 1 nssa default-information-originate 


Q7. A MPP has been implemented in a Cisco IOS-XR device. Which are the two results that will occur? (Choose two.) 

A. If MPP is disabled and a protocol is activated, all interfaces cannot pass traffic 

B. MPP configuration changes doesn't affect active sessions established before the changes 

C. RP/DRP Ethernet Interfaces are not default out-of-band interfaces 

D. Management traffic to RP from all non-MPP interfaces is dropped 

E. Interfaces configured for out-of-band MPP are still part of global routing/forwarding 

Answer: B,D 

Q8. 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 


Explanation: Reference: page 53 

Q9. A network administrator wants to implement an IP dampening feature for a network. Which parameter identifies how fast the accumulated penalty can decay exponentially? 

A. reuse threshold 

B. suppress threshold 

C. half-life period 

D. maximum suppress time 


Explanation: Reference: 

Q10. A client has an MPLS inter-AS implementation that is required to have QoS deployed between ASBRs based on IP packet. At the same time, the client requires minimization of the routing configuration between ASBRs for better scalability. Which MPLS inter-AS option can achieve this goal? 

A. Option A 

B. Option B 

C. Option C 

D. Option AB