Which command can you enter to display the operational status of the network ports on a router?
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A. B. C. D.A
The command that can be entered to display the operational status of the network ports on a router is "show interface status".
Explanation: A. "show ip interface brief" command displays the IP address, status, protocol, and any other interface-specific information of all the interfaces on the router. B. "show interface switchport" command displays the status of the switchport interfaces on a switch, not a router. C. "show running-config interface fastethernet 0/1" command displays the running configuration of the specified interface, not the operational status. D. "show interface status" command displays the operational status of all interfaces on the router, including the speed, duplex, link status, and VLAN status. This command is useful for troubleshooting connectivity issues or verifying the configuration of network ports.
Therefore, the correct answer is D. "show interface status".