A network administrator set up a network computer lab and discovered connectivity issues. The administrator is able to ping the fiber uplink interface, but none of the new PCs plugged into the switch respond to ICMP requests. Which of the following should the administrator perform FIRST?

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A network administrator set up a network computer lab and discovered connectivity issues. The administrator is able to ping the fiber uplink interface, but none of the new PCs plugged into the switch respond to ICMP requests. Which of the following should the administrator perform FIRST?