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Which two of these changes are necessary for SwitchA to meet the requirements?

Refer to the exhibit.

A junior network administrator was given the task of configuring port security on SwitchA to allow only PC_A to access the switched network throught port fa0/1.
If any other device is detected, the port is to drop frames from this device. The administrator configured the interface and tested it with successful pings from PC_A to RouterA, and then observe the output from these two show commands.

Which two of these changes are necessary for SwitchA to meet the requirements? (Choose two)

what is the problem on the Brevard router that is causing the lack of connectivity?

Two routers named Atlanta and Brevard are connected by their serial interfaces as shown in the exhibit, but there is no data connectivity between them. The Atlanta router is known to have a correct configuration. Given the partial configurations shown in the exhibit, what is the problem on the Brevard router that is causing the lack of connectivity?