A network technician is troubleshooting a client's workstation that is experiencing intermittent connectivity issues. The workstation is connected to a network switch via a 10-meter Ethernet cable. Upon inspection, the technician observes that the cable is coiled tightly with several other power cords and is running parallel to a fluorescent light fixture. Which of the following is the MOST likely cause of the intermittent connectivity?
- AA faulty network interface card (NIC) in the workstation.
- BIncorrect IP address configuration on the workstation.
- CElectromagnetic Interference (EMI) affecting the Ethernet cable.
- DOutdated drivers for the network interface card.
Show answer & explanationAnswer & explanation
Correct answer: C. Electromagnetic Interference (EMI) affecting the Ethernet cable.
The scenario describes an Ethernet cable running near power cords and a fluorescent light fixture, both of which are sources of electromagnetic interference (EMI). EMI can disrupt electrical signals in the cable, leading to intermittent connectivity and performance issues. Proper cable management, including separating data cables from power sources, is crucial to prevent EMI.
Why the other options are wrong
- A. A faulty NIC would typically cause consistent connectivity problems or no connectivity at all, rather than intermittent issues specifically linked to cable proximity to power sources.
- B. Incorrect IP configuration would likely result in no connectivity, not intermittent issues, and is less directly related to the physical cable placement.
- D. Outdated drivers might cause performance issues or compatibility problems, but they are unlikely to cause intermittent connectivity directly tied to physical cable routing near power sources.
Electromagnetic Interference (EMI)
EMI is a disturbance generated by an external source that affects an electrical circuit by electromagnetic induction, electrostatic coupling, or conduction. It can degrade network performance or even prevent a circuit from functioning.
- Caused by sources like power cables, fluorescent lights, and motors.
- Can lead to data corruption, intermittent connectivity, and reduced network speed.
- Shielded cables (STP) are more resistant to EMI than unshielded cables (UTP).
- Proper cable management and grounding help mitigate EMI.
Memory trick: Don't let electricity zap your network's flow!