Refer to the exhibit. Which port should a PLC with IP address 192.168.3.65 be plugged into in order to communicate to the rest of the network?

Question

Exhibit

Options

• AFastEthernet1/1
• BFastEthernet1/2
• CFastEthernet1/3
• DFastEthernet1/4
• EFastEthernet1/5

• A
  2% (1)
• B
  8% (4)
• C
  83% (40)
• D
  2% (1)
• E
  4% (2)

Explanation

FastEthernet1/3 is correct because the exhibit shows it is configured on the 192.168.3.0 subnet - the only interface whose network range includes 192.168.3.65, making it the correct entry point for that PLC to reach the rest of the network. FastEthernet1/1, 1/2, 1/4, and 1/5 are assigned to different subnets (such as 192.168.1.x, 192.168.2.x, etc.), so plugging into those ports would place the PLC on the wrong network segment, preventing communication unless additional routing and reconfiguration were done. The core concept here is subnet matching: a device must connect to the interface/port whose configured subnet contains the device's IP address. A reliable memory tip: match the third octet of the IP to the third octet of the interface's subnet - since the PLC is 192.168.3.65, you're looking for the port on the 192.168.3.x network, which is FastEthernet1/3 (a handy coincidence in this question that the subnet number matches the interface number).

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