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Q71. A network administrator is in charge of multiple IPsec VPN headend devices that service thousands of remote connectivity, point-to-point, IPsec/GRE tunnels. During a recent power outage, in which it was found that a backup power supply in one of those headend devices was faulty, one of the headend routers suffered a complete shutdown event. When the router was successfully recovered, remote users found intermittent connectivity issues that went away after several hours. Network operations staff accessed the headend devices and found that the recently recovered unit was near 100% CPU for a long period of time. How would you redesign the network VPN headend devices to prevent this from happening again in the future? 

A. Move the tunnels more evenly across the headend devices. 

B. Implement Call Admission Control. 

C. Use the scheduler allocate command to curb CPU usage. 

D. Change the tunnels to DMVPN. 


Q72. A Service Provider is designing a solution for a managed CE service to a number of local customers using a single CE platform and wants to have logical separation on the CE platform using Virtual Routing and Forwarding (VRF) based on IP address ranges or packet length. Which is the most scalable solution to provide this type of VRF Selection process on the CE edge device? 

A. Static Routes for Route Leaking 

B. Policy Based Routing 

C. Multi-Protocol BGP 

D. OSPF per VRF Instance 


Q73. You are tasked with implementing a 1000-phone remote access solution, where phones will traverse a WAN edge router. Assuming all of the following features are supported in a hardware-assisted manner, which of the following will have the most detrimental impact on the delay of the packet? 

A. encryption 

B. stateful firewall 

C. MPLS encapsulation 

D. GRE encapsulation 


Q74. Which statement about the behavior of OSPF on a hub-and-spoke topology is true? 

A. Additional host routes are added to the routing table on a NBMA network type. 

B. The DR and BDR election occurs regardless of the underlying OSPF network type. 

C. The DR election is a challenge unless a point-to-point network type is used. 

D. Traffic does not need to traverse the hub to reach the spokes. 


Q75. You are the lead IP network designer for a new service provider called XYZ, and you are working closely with the CTO to finalize design requirements. The CTO informs you that they want to transport IPv6 prefixes of customers through the XYZ network at this time; however, they need your advice on whether to deploy dual stack or MPLS 6PE/6VPE. Which two options do you recommend? (Choose two.) 

A. Build a dual-stack network. Enable BGP in the core. Redistribute EBGP routes into IGP. 

B. Use MPLS 6PE to simplify the operation and keep a BGP-free core. When the LDPv6 becomes available, change to 4PE or keep the core using both IPv4 and IPv6. The main goal is to keep the core BGP-free and ensure that IPv4, IPv6, VPNv4, and VPNv6 are all label-switched. 

C. Use MPLS 6VPE to simplify the operation and keep a BGP-free core. When the LDPv6 becomes available, change to 4PE or keep the core using both IPv4 and IPv6. The main goal is to keep the core BGP-free and ensure that IPv4, IPv6, VPNv4, and VPNv6 are all label-switched. 

D. Prepare the dual-stack infrastructure from the beginning, even if BGP prefixes would have to be announced via IPv4 in case you decide to maintain the BGP-free core. 

Answer: BD 

Q76. Refer to the exhibit. 

In this BGP design, what is the next hop for on R8 and R7? 

A. The next hop for on R7 is R8 and the next hop for R8 is R7. 

B. The next hop for on R7 is R5 and the next hop for R8 is R6. 

C. The next hop for on R7 is R6 and the next hop for R8 is R5. 

D. The next hop for on R7 is R3 and the next hop for R8 is R4. 


Q77. Service provider XYZ plans to provide dedicated Internet access and MPLS L3VPN services to business customers. XYZ has these design specifications: 

.  MP-BGP running on the core MPLS P routers with external Internet routes. 

. The core network will include 16 Point of Presence IP POPs throughout the Asia-Pacific region. . An additional nine non-P routers will use EBGP peering with multiple providers for Internet traffic. . An additional 50 PE routers will provide end customers with dedicated Internet access and L3VPN services throughout the Asia-Pacific region. 

In what two ways can the MP-BGP be removed from the MPLS P core routers and still provide dedicated Internet access and MPLS L3VPN services? (Choose two.) 

A. Disable BGP from the MPLS core P routers and have the MPLS core P routers run OSPF and LDP. 

B. Enable separate BGP control plane routers using a route reflector server concept that will be fully meshed with peer route reflector servers and have clients as MPLS PE routers and EBGP peering routers. 

C. Enable all EBGP routers as route reflector servers and MPLS PE routers as their clients. 

D. It is not possible to disable BGP from the MPLS core P routers without impacting the dedicated Internet access and MPLS L3VPN services. 

Answer: BC 

Q78. You have created a network design that has two point-to-point Metro Ethernet circuits extending a single production VLAN between two data centers. Under normal circumstances, one circuit will carry traffic and spanning tree will block the other. If the company wants you to make use of both circuits to carry production traffic, which two technologies and features will you investigate to integrate into your network design? (Choose two.) 

A. EtherChannel 


C. Multichassis EtherChannel 


Answer: AC 

Q79. 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 

Q80. To meet specific business requirements, QoS-marked traffic must be sent over a dedicated link. Which technology fulfills this requirement? 


B. Q-in-Q tunneling 

C. policy-based routing 

D. EIGRP with modified metrics