Refer to the exhibit.

In the DWDM network, a ring topology carries multiple services between two sites. Which option describes the employed protection design?

Which mechanism should be added to a network design to identify unidirectional Spanning Tree Protocol failures through BPDU loss?

You want to add 900 VLANs to the existing 90 VLANs on a data center. Which two spanning-tree concerns must you consider? (Choose two)

Study the following exhibit carefully. A service provider with a multi-area OSPF environment would like to deploy MPLS TE tunnels among PE routers across area boundaries. Configure the LSPs with bandwidth constraints and explicit loose route hops as indicated by the arrows in the following path:
PE1 -> ABR1 -> ABR2 -> PE2
Which two items identify devices that will execute constraint-based SPF in order to set up LSP from PE1 to PE2? (Choose two.)

Your design plan includes mutual redistribution of two OSPF networks at multiple locations, with connectivity to all locations in both networks. How is this accomplished without creating routing loops?