Top 10 ebook 400-201 for IT professionals (81 to 90)

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Q81. 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. 

Answer:

Explanation: 

http://www.cisco.com/web/about/security/intelligence/ipv6_rtbh.html Old Dumps Actual Test pg no.52 (520 Q) 

Q82. 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 

Q83. A service provider is designing control policies at the customer edge of the network, in order to prevent usage that exceeds the contracted terms A new client that is contracted for only 2 Gbps is connecting to the service provider edge with a 10 Gbps interface. Which two OoS strategies meet the design goal? (Choose two.) 

A. On the customer edge device, enable policing on the interface that is connected to the service provider. 

B. On the service provider edge, enable WRED on the customer port. 

C. On the customer edge, enable WRED on the interface that is connected to the service provider 

D. I On the service provider edge, enable policing on the customer port 

E. the customer edge device, enable traffic shaping on the interface that is connected to the service provider. 

F. C On the service provider edge, enable traffic shaping on the customer port 

Answer: D,E 

Q84. 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 

Answer:

Q85. 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:

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 

Q86. 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:

Q87. Refer to the exhibit. 

OSPF is already running with the default OSPF parameters. R1 has added a new subnet (loopback 11). What will occur in regards to SPT computing on R2 router? 

A. Adding ispf command on R2 router, the entire SPT will be computed on R2 router. 

B. Because 10.11.11.11/32 prefix information will be in a LSA type 3 on R2 router's OSPF database, R2 router will run partial SPF computation. 

C. Adding ispf command on R2 router, R2 router will recompute only the affected part of tree. 

D. Because 10.11.11.11/32 prefix will be a LSA type 1 on R2 router's OSPF database. R2 router will always run a full SPF computation, even though an OSPF optimization is applied on R2 router. 

Answer:

Q88. Refer to the exhibit. 

Which piece of information can be derived from this Cisco IOS XR route policy? 

A. If the destination is 227.0 0 3 or 227 0 0 13 the default table will be used for reverse path forwarding 

B. If the destination ranges between 227.0 0.3 and 227 0.0.13. the IPv4 unicast table will be used for reverse path forwarding 

C. If the destination is 227.0.0.3 or 227.0 0.13, the IPv4 unicast table will be used for reverse path forwarding 

D. If the destination ranges between 227.0.0.3 and 227.0.0.13. the multicast default table will be used for reverse path forwarding 

Answer:

Q89. DRAG DROP 

Drag each resiliency mechanism on the left to its corresponding technology on the right. 

Answer: 

Q90. A Service Provider connects to a client site that has two CEs. These CEs have a backdoor link for backup. OSPF is used as the routing protocol in this environment. You want to ensure that client traffic prefers the service provider connections for routing instead of the secondary connection. Which option describes the default behavior and the action that accomplishes your goal? 

A. The routes to the Service Provider are not preferred, due to the increased OSPF cost through the service provider network. Ensure that the cost on the links to the service provider are lower than the secondary connection. 

B. The routes to the Service Provider are seen as external type 1 in the OSPF database. Configure a domain ID that is the same across all PEs, to ensure that customers see routes as intra-area. 

C. The routes to the Service Provider are seen as inter-area OSPF routes through the network. Configure a sham link to create a new intra-area path across the service provider network between the PE routers that service the client. 

D. The routes to the Service Provider are seen as equal and cause nondeterministic traffic patterns. Ensure that the secondary connection has a higher cost than the links to the service provider. 

Answer:

Explanation: http://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-sy/iro-15-sy-book/iro-sham-link.html#GUID-BEA06826-713E-4F71-B4A4-9E3DA3BAC3FC 

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