Refer to the exhibit.
17

How would you adjust the design to improve convergence on the network?
A. Add an intra-POP link between routers 1A and 1B, and enable IP LFA FRR.
B. Use an IP SLA between the end stations to detect path failures.
C. Enable SSO-NSF on routers 1A and 1B.
D. Use BGP to connect the sites over the WAN.

Refer to the exhibit.
16

The design is being proposed for use within the network. The CE devices are OSPF graceful restart-capable,
and the core devices are OSPF graceful restart-aware. The WAN advertisements received from BGP are
redistributed into OSPF. A forwarding supervisor failure event takes place on CE A. During this event, how will
the routes learned from the WAN be seen on the core devices?
A. via CE A and CE B
B. via CE A
C. via CE B
D. no WAN routes will be accessible

A large enterprise customer is migrating thousands of retail offices from legacy TDM circuits to an Ethernet-based service. The network is running OSPF and has been stable for many years. It is now possible to
backhaul the circuits directly to the data centers, bypassing the regional aggregation routers. Which two
networking issues need to be addressed to ensure stability with the new design? (Choose two.)
A. Nothing will change if the number of offices is the same.
B. Nothing will change if the number of physical interfaces stays the same.
C. The RIB will increase significantly.
D. The FIB will increase significantly.
E. The amount of LSA flooding will increase significantly.
F. The size of the link-state database will increase significantly.

15

During a network design review, it is recommended that the network with a single large area should be broken
up into a backbone and multiple nonbackbone areas. There are differing opinions on how many ABRs are
needed for each area for redundancy. What would be the impact of having additional ABRs per area?
A. There is no impact to increasing the number of ABRs.
B. The SPF calculations are more complex.
C. The number of externals and network summaries are increased.
D. The size of the FIB is increased.

In a large enterprise network with multiple data centers and thousands of access devices, OSPF is becoming
unstable due to link flapping. The current design has the access devices multihomed to large aggregation
routers at each of the data centers. How would you redesign the network to improve stability?
A. Add a layer of regional Layer 3 aggregation devices, but leave the ABR function on the data center
aggregation routers.
B. Add a layer of regional Layer 2 aggregation devices, but leave the ABR function on the data center
aggregation routers.
C. Add a layer of regional Layer 3 aggregation devices and move the ABR function to the regional
aggregation device.
D. Add a layer of regional Layer 2 aggregation devices and move the ABR function to the regional
aggregation device.

What are two benefits of following a structured hierarchical and modular design? (Choose two.)
A. Each component can be designed independently for its role.
B. Each component can be managed independently based on its role.
C. Each component can be funded by different organizations based on its role.
D. Each component can support multiple roles based on the requirements.
E. Each component can provide redundancy for applications and services.

Refer to the exhibit.

In this network design, where should summarization occur to provide the best summarization and optimal
paths during a single-failure incident as well as during normal operation?
A. a single identical summary for all the branch offices placed on routers 1A, 1B, 2A, and 2B
B. two summaries on 1A and 1B, and two summaries on 2A and 2B
C. a single identical summary on 3A and 3B
14

D. a single summary on each aggregation device for the branches connected to them

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

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

What are three key design principles when using a classic hierarchical network model? (Choose three.)
A. The core layer controls access to resources for security.
B. The core layer should be configured with minimal complexity.
C. The core layer is designed first, followed by the distribution layer and then the access layer.
D. A hierarchical network design model aids fault isolation.
E. The core layer provides server access in a small campus.
F. A hierarchical network design facilitates changes.