CompTIA Network+ (N10-008) — Question 178

A user in a branch office reports that access to all files has been lost after receiving a new PC. All other users in the branch can access fileshares. The IT engineer who is troubleshooting this incident is able to ping the workstation from the branch router, but the machine cannot, ping the router. Which of the following is MOST likely the cause of the incident?

Answer options

• A. Incorrect subnet mask
• B. Incorrect DNS server
• C. Incorrect IP class
• D. Incorrect TCP port

Correct answer: A

Explanation

The most probable cause of the issue is an incorrect subnet mask, which can prevent the workstation from communicating properly with the router, resulting in the inability to ping it. The other options, such as incorrect DNS server settings or IP class, wouldn't specifically cause the loss of connectivity to the router while allowing other users to access fileshares.