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Q131. A company would like to distribute a virtual machine (VM) hosting cluster between three data centers with the capability to move VMs between sites. The connectivity between data centers is IP only and the new design should use the existing WAN. Which Layer 2 tunneling technology do you recommend? 


B. L2TPv3 


D. AToM 


Q132. A network designer is redesigning an enterprise campus network to ensure that Ethernet switches proactively attempt to reconnect after a fiber cut. In the design, they will have to address areas where fiber cuts exist on campus from past troubleshooting, where a single fiber is disconnected in the fiber pair, leading to looping. Which feature could be implemented in the design to allow the Spanning Tree Protocol on the switches to be protected? 

A. loop guard 

B. UniDirectional Link Detection 

C. UniDirectional Link Detection aggressive mode 

D. root guard 


Q133. You are designing an optical network. Your goal is to ensure that your design contains the highest degree of resiliency. In which two ways will you leverage a wavelength-switched optical network solution in your network design? (Choose two.) 

A. a wavelength-switched optical network assigns routing and wavelength information 

B. a wavelength-switched optical network takes linear and nonlinear optical impairment calculation into account 

C. a wavelength-switched optical network guarantees restoration based strictly on the shortest path available 

D. a wavelength-switched optical network eliminates the need for dispersion compensating units in a network 

Answer: AB 

Q134. A company is planning to connect its 30 sites with a VPLS WAN backbone. A router at each site should establish neighborships with all other routers using the OSPF routing protocol. Which three points must be considered regarding DR and BDR when different router platforms are used? (Choose three.) 

A. It is a best practice that the routers with the most powerful hardware should take the role of the DR and BDR. 

B. If the IP OSPF priority is the same for all routers, the highest loopback IP address and router ID will decide which routers will take the DR and BDR role during the selection process. 

C. To select the DR and BDR, the IP OSPF priority must be set to a higher value than the default value at the DR and BDR during the selection process. 

D. To select the DR and BDR, the IP OSPF priority must be set to a lower value than the default value at the DR and BDR during the selection process. 

E. The role for the DR and BDR will be selected when a new OSPF router comes up. 

F. To force two routers to become a DR and a BDR, the IP OSPF priority can be set to zero at all other OSPF routers. 

Answer: ABF 

Q135. An IBGP mesh design is being scoped, and in the discussions, one of the design engineers proposes the use of route reflectors. Which limitation is valid when using route reflectors in this design? 

A. The configuration complexity on the routers will be increased. 

B. Route reflectors will limit the total number of routes in the topology. 

C. Multipath information is difficult to propagate in a route reflector topology. 

D. Route reflectors will cause an opportunity to create routing loops. 


Q136. Which design concern should be accounted for in all Layer 3 virtualization technologies? 

A. Layer 3 redundancy 

B. packet sizing 

C. application usage 

D. Layer 3 stability 


Q137. Which two options are two advantages of summarizing networks at the aggregation layer rather than at the core? (Choose two.) 

A. It prevents the core from having unnecessary routes. 

B. It no longer needs a core layer. 

C. It prevents black hole routing. 

D. It avoids network-wide impact upon VLAN changes local to the aggregation devices. 

Answer: AD 

Q138. What are two design advantages to using virtual port channel? (Choose two.) 

A. enhanced system availability through multiple systems 

B. reduced Spanning Tree Protocol convergence time 

C. loop management without use of Spanning Tree Protocol 

D. ability to use Spanning Tree Protocol blocked ports to forward traffic 

E. enhanced ability to recover from Spanning Tree Protocol changes 

Answer: AC 

Q139. When a multiprotocol environment is designed to have several routers redistribute among the routing domains, how can routing loops be avoided? 

A. by using the AS-PATH attribute 

B. by using route tags 

C. by activating split horizon 

D. by implementing spanning tree 


Q140. You are designing a network that will run EIGRP over a Metro Ethernet service that does not employ a link-loss technology. What will be the impact on convergence if there is a break in the end-to-end Layer 2 connectivity within the service provider network? 

A. The routers will immediately lose their adjacencies and converge. 

B. The routing protocol will not converge until the hold timers have expired. 

C. The switch ports connected to the router will go down and the routers will immediately converge. 

D. The VLAN on the switches will go inactive, the ports associated on the switch will go down, and the routers will immediately converge.