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N10-009 · Question #554

A network engineer connects a business to a new ISP. A simple ping test to 8.8.8.8 is successful. However, users complain of extreme slowness to any website and periods of no connectivity. Which of…

The correct answer is D. Duplicate ISP IP address. If the business shares or duplicates the ISP-assigned public IP address, routing instability and conflicts will occur. Pinging a public IP like 8.8.8.8 may work (since ICMP can bypass certain conflicts), but browsing websites (which requires stable sessions and return traffic)…

Submitted by stefanr· Mar 6, 2026Network troubleshooting

Question

A network engineer connects a business to a new ISP. A simple ping test to 8.8.8.8 is successful. However, users complain of extreme slowness to any website and periods of no connectivity. Which of the following is the most likely cause?

Options

  • AIncorrect default gateway
  • BVLAN mismatch
  • CSubnet mask configuration
  • DDuplicate ISP IP address

How the community answered

(24 responses)
  • A
    29% (7)
  • B
    8% (2)
  • C
    4% (1)
  • D
    58% (14)

Explanation

If the business shares or duplicates the ISP-assigned public IP address, routing instability and conflicts will occur. Pinging a public IP like 8.8.8.8 may work (since ICMP can bypass certain conflicts), but browsing websites (which requires stable sessions and return traffic) will fail

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