Refer to the exhibit. Company XYZ has 150 branch locations across the U.S. Each branch is connected to two aggregation routers, one router in each data center. The network is configured with multiple OSPF areas, and the aggregation routers are ABRs. A requirement is to keep an optimal path to the data centers and, at the same time, reduce the LSA propagation and SPF recomputation during a change in any part of the network.
Which design element should be included on the aggregation routers?

Refer to the exhibit. Company ABC is a Tier 3 service provider that offers Layer 2 and Layer 3 transport for small/medium enterprise customers in the US. Most of their network is built on Layer 2 MPLS circuits from a Tier 1 provider. Many Company ABC customers are using overlay VPN technologies and independent routing protocols, and they are affected with unacceptable convergence time after every major outage in the core of the Tier 1 provider. Which long-term redesign increases network availability?

Which openstack component implements role-based access control?

Refer to the exhibit.

What limitations exist in this design, given that the access layer devices are expected to steadily increase by two devices per week for the next year?

Which purpose of a dynamically created tunnel interface on the design of IPv6 multicast services is true?