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Q1. A data center provider has designed a network using these requirements:
Two data center sites are connected to the public Internet.
Both data centers are connected to different Internet providers.
Both data centers are also directly connected with a private connection for the internal traffic, and public Internet traffic can also be routed at this direct connection.
The data center provider has only one /19 public IP address block.
Under normal conditions, Internet traffic should be routed directly to the data center where the services are located. When one Internet connection fails, the complete traffic for both data centers should be routed by using the remaining Internet connection. In which two ways can this routing be achieved? (Choose two.)
A. The data center provider must have an additional public IP address block for this routing.
B. One /20 block is used for the first data center and the second /20 block is used for the second data center. The /20 block from the local data center is sent out with a low BGP weight and the /20 block from the remote data center is sent out with a higher BGP weight at both sites.
C. One /20 block is used for the first data center and the second /20 block is used for the second data center. The /20 block from the local data center is sent out without path prepending and the /20 block from the remote data center is sent out with path prepending at both sites.
D. One /20 block is used for the first data center and the second /20 block is used for the second data center. Each /20 block is only sent out locally. The /19 block is sent out at both Internet connections for the backup case to reroute the traffic through the remaining Internet connection.
E. One /20 block is used for the first data center and the second /20 block is used for the second data center. The /20 block from the local data center is sent out with a low BGP local preference and the /20 block from the remote data center is sent out with a higher BGP local preference at both sites.
F. BGP will always load-balance the traffic to both data center sites.
Answer: CD
Q2. There is an MPLS-enabled link constantly flapping on an MPLS VPN network. Given that the network runs OSPF as the IGP protocol, which design mechanism will stabilize the network and avoid constant reconvergences?
A. BFD
B. IP Event Dampening
C. OSPF fast hellos
D. partial SPF
Answer: B
Q3. Which three techniques can be used to improve fault isolation in an enterprise network design? (Choose three.)
A. aggregate routing information on an OSPF ABR
B. fully meshed distribution layer
C. Equal-Cost Multipath routing
D. EIGRP query boundaries
E. multiple IS-IS flooding domains
F. tuned Spanning Tree Protocol timers
Answer: ADE
Q4. You are designing a network to support data, voice and video. Which two main factors will you address to improve network convergence? (Choose two.)
A. event propagation delay
B. failure detection delay
C. forwarding engine update delay
D. routing table recalculation delay
Answer: BD
Q5. You are designing a Group Encrypted Transport virtual private network solution for an existing branch network. The existing network has the following characteristics:
. 50 remote sites (with an additional 30 remote sites expected over the next 3 years) . Connectivity between all sites is via Multiprotocol Label Switching Layer 3 virtual private network service from a single provider . Open Shortest Path First is the routing protocol used between provider edge and customer edge routers . The customer edge routers will become group members performing the encryption between sites
Which additional routing protocol would you use for the overlay routing between the group members?
A. Open Shortest Path First (with a different process ID)
B. Enhanced Interior Gateway Routing Protocol
C. No additional protocol is necessary.
D. External Border Gateway Protocol
E. Routing Information Protocol Version 2
F. Next Hop Resolution Protocol
Answer: C
Q6. A large service provider offers VoIP and Video services to business customers. Which three areas should the service provider monitor related to these services? (Choose three.)
A. bandwidth utilization
B. service response time
C. packet loss
D. jitter
E. latency
F. availability
Answer: CDE
Q7. 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
Q8. Company A has grown nationwide in the U.S., and each new remote branch has a Metro Ethernet circuit provisioned back to the data center at the headquarters on the West Coast. The operations team says that it cannot manage hundreds of circuits as the company continues to grow. You review the topology and notice that many of the branches are close to each other in geographical zones. How can you redesign this network to improve manageability and increase scalability?
A. Add an aggregation layer router in each geographical zone.
B. Add a redundant data center on the East Coast to serve some of the traffic there.
C. Add a default route in each branch toward the data center on the West Coast.
D. Use Optimized Edge Routing at the data center.
E. Build an overlay MPLS network with Layer 3 VPN.
Answer: A
Q9. You work as a network designer for a company that is replacing their Frame Relay WAN with an MPLS VPN service, where the PE-to-CE routing protocol is BGP. The company has 3000 routes in their distribution routers, and they would like to advertise their access routers through the MPLS network. Their service provider, however, only supports 1000 prefixes per VRF. Which two design solutions can be applied to ensure that your access routers will be able to reach all devices in your network? (Choose two.)
A. Use prefix lists on your distribution routers to control which routes are sent to the MPLS network.
B. On your distribution routers, configure null routes and aggregate routes for the prefixes in your network.
C. Configure your distribution routers to send a default route to the MPLS network.
D. Summarize the routes on the MPLS WAN interfaces of your distribution routers.
Answer: BC
Q10. 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.
Answer: C
Q11. A junior engineer is implementing one of your optical designs and asks about CWDM (Coarse Wavelength Division Multiplexing). Which two features describe CWDM? (Choose two.)
A. typically used over long distances, but requires optical amplification
B. allows up to 32 optical carriers to be multiplexed onto a single fiber
C. shares the same transmission window as DWDM
D. uses the 850-nm band
E. Passive CWDM devices require no electrical power.
Answer: CE
Q12. You are designing the QoS features for a large enterprise network that includes DMVPN. When would you need to configure QoS preclassify?
A. when you are marking packets with the DSCP bits
B. when you are marking packets with the TOS bits
C. when your service provider requires the DSCP bits be set
D. when the QoS policy cannot be based on DSCP ToS bits
Answer: D
Q13. A company plans to establish a new network using Cisco Catalyst switches for its multicast applications. What is the disadvantage when two multicast applications are using the multicast IP addresses 234.17.4.5 and 234.145.4.5 inside the same network?
A. Multicast packets from both applications are flooded to all Layer 2 ports in a segment where a multicast receiver is located.
B. Multicast packets from both applications are flooded to ports where one multicast receiver from one application is located.
C. Only one multicast stream is received at the port where the receivers from both applications are located.
D. Both multicast senders will always receive the multicast packets from the other multicast application.
E. The routers doing PIM-SM cannot distinguish between the two multicast applications.
Answer: B
Q14. 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
Q15. When you design a network, when would it be required to leak routes into a Level 1 area?
A. when a multicast RP is configured in the nonbackbone area
B. when MPLS L3VPN PE devices are configured in the Level 1 areas
C. when equal cost load balancing is required between the backbone and nonbackbone areas
D. when unequal cost load balancing is required between the backbone and nonbackbone areas
Answer: B