N10-005 Question #616: Real Exam Question with Answer & Explanation

The correct answer is B: Failed router. The key clue is that internal resources (file shares) work fine while all internet access is down simultaneously. Internal communication uses Layer 2 switching and does not require a router, but internet-bound traffic must pass through the router (default gateway) to reach extern

Question

During business hours, users at a small office are reporting that all of a sudden they are unable to reach any host on the Internet, but they can still use the network shares to transfer files within the office. Which of the following is the MOST likely cause of the outage?

Options

AWrong gateway
BFailed router
CBad switch module
DIncorrect VLAN

Explanation

The key clue is that internal resources (file shares) work fine while all internet access is down simultaneously. Internal communication uses Layer 2 switching and does not require a router, but internet-bound traffic must pass through the router (default gateway) to reach external networks. A failed router cuts off all outbound internet traffic while leaving the local LAN fully functional - exactly matching the described symptoms. A wrong gateway would typically be a pre-existing misconfiguration, not a sudden outage. A bad switch module would disrupt local connectivity too, not just internet access. An incorrect VLAN would cause segmentation issues affecting specific groups, not a sudden total internet outage for all users.

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