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A NAS appliance has recently had a failed NIC replaced, and now the NAS appliance is no longer visible on the network. Which of the following is the MOST likely cause of the problem?
MAC address binding on the managed switch.
The network cable connecting the NAS to the network switch is bad.
Firewall needs to be updated for the new NAS device.
The network port that the appliance is connected to is assigned to the wrong VLAN.
Switches use "port security" to prevent unauthorized devices from connecting to the network, by storing (or binding) the MAC address of the attached device to the port that it is connected to on the switch. When the NIC is replaced, the MAC address changed for the NAS (MAC Addresses are hard-coded into all NICs, so each NIC has its own MAC Address). If port security is enabled on the switch, then the switch would block the new NIC in the NAS from being able to connect to the network.
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