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N10-009 · Question #347

A network administrator is troubleshooting a connectivity issue between two devices on two different subnets. The administrator verifies that both devices can successfully ping other devices on the…

The correct answer is A. Incorrect default gateway. When two devices on different subnets are unable to communicate, but can communicate with other devices on their own subnet, the issue is most often related to routing. Devices on different subnets require a default gateway to route traffic between networks. If the default…

Submitted by sofia.br· Mar 6, 2026Network Troubleshooting

Question

A network administrator is troubleshooting a connectivity issue between two devices on two different subnets. The administrator verifies that both devices can successfully ping other devices on the same subnet. Which of the following is the most likely cause of the connectivity issue?

Options

  • AIncorrect default gateway
  • BFaulty Ethernet cable
  • CWrong duplex settings
  • DVLAN mismatch

How the community answered

(61 responses)
  • A
    79% (48)
  • B
    3% (2)
  • C
    11% (7)
  • D
    7% (4)

Explanation

When two devices on different subnets are unable to communicate, but can communicate with other devices on their own subnet, the issue is most often related to routing. Devices on different subnets require a default gateway to route traffic between networks. If the default gateway is incorrectly configured, the device won't know how to reach other subnets.

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