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Q51. In a redesign of a multiple-area network, it is recommended that summarization is to be implemented. For redundancy requirements, summarization is done at multiple locations for each summary. Some customers now complain of higher latency and performance issues for a server hosted in the summarized area. What design issues should be considered when creating the summarization? 

A. Summarization adds CPU overhead on the routers sourcing the summarized advertisement. 

B. Summarization prevents the visibility of the metric to the component subnets. 

C. Summarization creates routing loops. 

D. Summarization causes packet loss when RPF is enabled. 

Answer: B 

Q52. Refer to the exhibit. 

When designing an MPLS-based LAN extension between DC-1 and DC-2, what are three advantages of deploying VSS? (Choose three.) 

A. Layers 2, 3, and 4 flow-based load balancing 

B. native VSS and MEC failover without using scripts 

C. sub-second failover 

D. required to configure VPLS 

E. failover time depends on Cisco IOS EEM and STP convergence 

F. limited VLAN-based VPLS traffic hashing 

Answer: A,B,C 

Q53. Which two design aspects should a metro service provider consider when planning to deploy REP for his backbone? (Choose two.) 

A. Two REP segments can be connected redundantly at two points, one connection will be blocked as per the STP defined in IEEE 802.1d. 

B. UDLD can be enabled on REP interfaces to detect unidirectional failures. 

C. The guaranteed convergence recovery time is less than 50 ms for the local segment. 

D. A REP segment is limited to a maximum of seven devices. 

E. VLAN load balancing for optimal bandwidth usage is supported in any REP segment. 

Answer: BE 

Q54. A company wants to use SSM as the multicast routing protocol inside its network. Some of its multicast applications do not support IGMPv3. In which two ways can the mapping be done when these applications send IGMPv2 join messages? (Choose two.) 

A. The Layer 2 switches can send a request to a DNS server. 

B. The Layer 3 multicast routers can send a request to a DNS server. 

C. The mapping can be done statically at the Layer 2 switches. 

D. The mapping can be done statically at the Layer 3 multicast routers. 

E. The Layer 2 switches can transform the IGMPv2 join to an IGMPv3lite join. 

F. The Layer 3 multicast routers can transform the IGMPv2 join to an IGMPv3lite join. 

Answer: BD 

Q55. The Service Provider you work for wants to deploy CoS functionality on the P routers of the MPLS core, to provide a complete CoS solution to all customers that purchase services such as dedicated Internet access, MPLS Layer 3 VPN, and Layer 2 VPN (pseudowire). The design requirements are: 

. The network supports four service queues with equal treatment for delay, jitter, 

and packet loss. 

. Queues are numbered 0–3, where 0 is the default queue. 

. Three queues have one treatment, whereas the other queue has either one or two 

treatments. 

. The Service Provider manages control traffic, whereas the customers manage 

business critical and best effort. 

Which two statements could you recommend to allow for the appropriate level of bandwidth allocation? (Choose two.) 

A. Control plane 10%, Real Time 30%, Business Critical 40%, Best Effort 20% 

B. Control plane 80%. Real Time 10%, Business Critical 5%, Best Effort 5% 

C. Control plane 90%, Real Time 5%, Business Critical 5%, Best Effort 0% 

D. Control plane 20%, Real Time 40%, Business Critical 30%, Best Effort 10% 

Answer: AD 

Q56. A customer is using a service provider to provide a WAN backbone for a 30-site network. In establishing the network, the customer must work within these constraints: 

The customer has a self-managed MPLS backbone. 

The VPLS WAN backbone of the service provider does not support PIM snooping. 

Multicast VPN must be used for multicast support inside some VRFs. 

What can the customer do so that multicast traffic is NOT flooded to all sites? 

A. Configure static GRE tunnels and run the MPLS and multicast VPN inside these GRE tunnels. 

B. Use Label Switched Multicast for the multicast transport. 

C. Use PIM-SSM as the multicast routing protocol with IETF Rosen Draft multicast VPN. 

D. Configure a static mapping between multicast addresses and MAC addresses. 

E. Use GET VPN to encrypt the multicast packets inside the WAN. 

Answer: A 

Q57. When creating a network design, which one of these options provides for basic Layer 2 client isolation to prevent broadcast traffic exposure? 

A. SVI 

B. VLAN 

C. routed port 

D. edge port 

Answer: B 

Q58. Refer to the exhibit. 

How would you redesign the network to improve availability of the routers 1A and 1B at the core site? 

A. Enable Graceful Restart Helper for OSPF 

B. Use link bundles over multiple slots 

C. Use APS Ethernet circuits and redundant interfaces 

D. Create a multichassis system with the two routers 

Answer: D 

Q59. Which option is a BFD design consideration? 

A. BFD should not be used with RSVP-TE backup tunnels. 

B. BFD echo mode may reduce convergence time. 

C. BFD does not support sessions over MPLS LSPs. 

D. BFD is supported on indirectly connected peers. 

Answer: B 

Q60. To improve the stability of a global network, you have been tasked with changing the design to include link-state topology summarization. What are two issues that you should address as part of the design? (Choose two.) 

A. slow convergence 

B. suboptimal routing 

C. traffic black-holing 

D. packet reordering 

Answer: BC