Q1. A service provider creates a network design that runs MPLS in its WAN backbone using OSPF as the IGP routing protocol. What would be two effects of additionally implementing MPLS-TE? (Choose two.)
A. MPLS-TE is required to reroute traffic within less than 1 second in case of a link failure inside the backbone.
B. MPLS-TE is required to route different MPLS QoS service classes through different paths.
C. MPLS-TE and OSPF cannot be used together inside one MPLS network.
D. MPLS-TE cannot use OSPF for the traffic path calculation.
E. MPLS-TE is required to create backup paths independently from the IGP.
Answer: B,E
Q2. Refer to the exhibit.
A new IPv4 multicast-based video-streaming service is being provisioned. During the design-validation tests, you realize that the link between the two buildings is carrying multicast traffic even when there are no receivers connected to the switch in Building B and despite IGMP snooping being enabled on both Layer 2 switches and IGMPv2 runs on the hosts. Which design change will prevent the multicast traffic from being unnecessarily flooded throughout the campus network?
A. Enable PIM snooping on both Layer 2 switches.
B. Enable multicast storm control on the link between Switch 1 and Switch 2.
C. Use static Layer 2 MAC forwarding entries on Switch 1.
D. Change the IPv4 multicast group address such that it excludes the usage of link-local MAC addresses.
E. Ensure that Switch 1 is an IGMP querier.
Answer: D
Q3. A network design shows two routers directly connected to an Ethernet switch using optical connections. There is an OSPF adjacency between the routers. In this design, which solution will ensure that interface down detection is reported as quickly as possible to the IGP?
A. optimized OSPF SPF timers
B. Bidirectional Forwarding Detection
C. automatic protection switching
D. optimized OSPF LSA timers
E. Ethernet OAM CFM monitoring
Answer: B
Q4. When creating a design plan for IPv6 integration, you decide to use stateless encapsulation of IPv6 packets into IPv4 tunnels between subscriber CPEs and a border relay. Which deployment technique allows for this functionality?
A. 6rd
B. Dual-Stack Lite
C. 4rd
D. DSTM
Answer: A
Q5. What is a key role for the access layer in a hierarchical network design?
A. The access layer provides a security, QoS, and policy trust boundary.
B. The access layer provides an aggregation point for services and applications.
C. The access layer serves as a distribution point for services and applications.
D. The access layer can be used to aggregate remote users.
Answer: A
Q6. 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
Q7. 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
Q8. Refer to the exhibit.
You are designing an IPv4 unicast Layer 3 VPN load-balancing solution. Which L3VPN feature needs to be configured on the PE routers to support the design requirement?
A. nonmatching route distinguishers
B. matching route target values
C. disable split horizon on PE2 and PE3
D. matching route distinguishers
Answer: A
Q9. Which mechanism provides a Layer 2 fault isolation between data centers?
A. TRILL
B. LISP
C. advanced VPLS
D. OTV
E. fabric path
Answer: D
Q10. 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