400-201 Exam Questions - Online Test

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Q61. Refer to the exhibit. 

When a traceroute is performed from a PC behind R2, the next hop on R1 for IPv4 is 10.0.1.2, and for IPv6 it is 2001:DB8:2:2. What is causing thus behavior? 

A. GigabitEthernet2/1 has a Level 1-only adjacency. This causes it to be the preferred path for the IPv6 packets. 

B. When SPF ran on R2, it calculated two equal paths to R1. It was a coincidence that than the packets choose different paths. 

C. Multitopology is enabled on R2, which causes the IPv6 packets to use a different path than the IPv4 packets. 

D. 2001:DB8:2::2 is on a Gigabit Ethernet interface. Because its speed is higher than Fast Ethernet, the IS-IS metric is preferred. 

Answer: C 

Q62. Refer to the exhibit. 

In the topology, networks in VRF A use the service provider network for transport. PE1 and PE2 run MP-BGP VPNv4 peering. Links between PE and P routers have MPLS enabled. Links between R1 and P routers do not support MPLS. 

Which technology can be implemented to build MPLS services between P1 and P2? 

A. Layer 3 VPN over GRE Tunnels 

B. L2TPv3 

C. RSVP Signaled Tunneling 

D. MPLS LDP Tunnels 

E. MPLS TE 

Answer: B 

Q63. 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: B 

Q64. An engineer is implementing an MPLS within the core of the Service Provider network. What two components are required to build the control and data plane for MPLS Label Switched Paths? (Choose two.) 

A. FIB 

B. CEF 

C. LDP 

D. LFIB 

E. OSPF 

Answer: B,C 

Q65. Refer to the exhibit. 

A service provider is running MPLS TE across its network. IS-IS is deployed as the IGP for the ISP network. The MPLS TE tunnel 0 configured on PE2 is seen in an operational down state. PE2 is a level-1 router and the destination 192.168.1.1 is located in the IS-IS level-2 area. Which action is required to bring the MPLS TE tunnel 0 to up state? 

A. Configure the next-address entries as loose paths in the explicit-path. 

B. Change the autoroute option from destination to announce. 

C. Configure a bandwidth value for the tunnel. 

D. Configure an IPv4 address for the Tunnel 0. 

E. Add a dynamic path option to the tunnel. 

Answer: A 

Q66. Which information is carried in the OSPFv3 intra-area Prefix LSA? 

A. All link-local addresses 

B. All IPv6 prefix and topology information that OSPFv2 included in Router LSA and Network LSA 

C. List of options associated with the link to all other routers attached to the link 

D. All prefix-specific information that OSPFv2 included in Router LSA and Network LSA 

Answer: D 

Explanation: 

OSPFv3's new LSA, the Intra-area Prefix LSA (type 9), handles intra-area network information that was previously included in OSPFv2 type 2 LSAs. It is used in order to advertise one or more IPv6 prefixes. The prefixes are associated with router segment, stub network segment or transit network segment. Intra-area prefix LSAs (type 9) & Inter-Area-Prefix-LSA (type 3) carry all IPv6 prefix information, which, in IPv4, is included in router LSAs and network LSAs. 

Q67. Which is the main characteristic of LTE architecture compared to other mobile architectures? 

A. Provides supports to deploy Layer 3 MPLS VPN model, where other mobile architectures do not support. 

B. Offers node redundancy with the static route configured on the IP NodeB using the HSRP/VRRP virtual ip address. 

C. Provides a simpler, less hierarchical model with the capability of simplistically distributing the core gateways. 

D. Introduces a hierarchical model with connection-oriented service requirements and one-to-one relationships. 

Answer: C 

Explanation: https://books.google.co.in/books?id=-fyjBAAAQBAJ&pg=PA50&lpg=PA50&dq=LTE+Provides+a+simpler,+less+hierarchical+mo del+with+the+capability+of+simplistically+distributing+the+core+gateways.&source=bl&ots =Bwpk3CQ_jN&sig=2-kgrCA_7hEX3kuvSxWVV2AnAS0&hl=en&sa=X&ved=0CB0Q6AEwAGoVChMI_5La8tbCx wIVgZ6OCh1N7gHa#v=onepage&q=LTE%20Provides%20a%20simpler%2C%20less%20 hierarchical%20model%20with%20the%20capability%20of%20simplistically%20distributing %20the%20core%20gateways.&f=false 

Q68. 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: C 

Q69. 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 

Q70. Based on the following configuration: 

Which two statements about multicast VPN configuration are true? (Choose two.) 

A. The multicast tree is created based only on the existence of active sources or receivers behind PEs in the ABC VRF. 

B. The service provider core network is required to support SSM. 

C. Multicast needs to be enabled only on ABC VRF and is tunneled to participating PE routers in the ABC VRF. 

D. The SP core network is required in order to enable the BGP Multicast Address Family on all peering. 

E. Multicast is required for the core network in addition to the ABC VRF. 

F. The multicast tree exists regardless of whether there are any active sources or receivers in the ABC VRF. 

Answer: E,F 

Explanation: http://www.ciscopress.com/articles/article.asp?p=32100&seqNum=4 

http://www.cisco.com/en/US/tech/tk828/technologies_white_paper09186a00800a3db6.sht ml