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220-1201 · Question #252

A technician is troubleshooting a network issue. Users report that the connection keeps dropping and reconnecting every few seconds. The technician: - Verifies the network configuration settings are…

The correct answer is D. Check the network logs for evidence of port flapping. Since the NIC, cable, and workstation configuration have all been ruled out, and the problem persists even with a known-good PC on the same switch port, this behavior points to an unstable link at the switch itself (often called “port flapping”). Examining the switch’s event or…

Submitted by valeria.br· Mar 30, 2026Hardware and Network Troubleshooting

Question

A technician is troubleshooting a network issue. Users report that the connection keeps dropping and reconnecting every few seconds. The technician:

  • Verifies the network configuration settings are correct on the

workstation

  • Tests the network cable from the workstation to the switch and finds

no issues

  • Uses a known-good workstation on the existing network cable and

replicates the reported issue Which of the following should the technician do next?

Options

  • AAdd new network hardware to reduce congestion
  • BAssign a static IP to the impacted workstations.
  • CValidate the environment for external interference.
  • DCheck the network logs for evidence of port flapping.

How the community answered

(37 responses)
  • A
    14% (5)
  • B
    22% (8)
  • C
    5% (2)
  • D
    59% (22)

Explanation

Since the NIC, cable, and workstation configuration have all been ruled out, and the problem persists even with a known-good PC on the same switch port, this behavior points to an unstable link at the switch itself (often called “port flapping”). Examining the switch’s event or syslog will reveal if the port is constantly going up and down, confirming a hardware or configuration issue on the switch side.

Topics

#Network troubleshooting#Port flapping#Switch diagnostics#Network connectivity

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