Which three techniques can be used to improve fault isolation in an enterprise network design?
(Choose three.)

When you design a network, when would it be required to leak routes into a Level 1 area?

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?

What are two benefits of following a structured hierarchical and modular design? (Choose two.)

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?

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 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.)

Refer to the exhibit.

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?

Refer to the exhibit.

How would you adjust the design to improve convergence on the network?

A company requests that you consult with them regarding the design of their production,
development, and test environments. They indicate that the environments must communicate
effectively, but they must be kept separate due to the inherent failures on the development
network. What will be configured on the links between the networks to support their design
requirements?