CompTIA Network+ (N10-008) — Question 785

A technician removes an old PC from the network and replaces it with a new PC that is unable to connect to the LAN. Which of the following is MOST likely the cause of the issue?

Answer options

• A. Port security
• B. Port tagging
• C. Port aggregation
• D. Port mirroring

Correct answer: A

Explanation

The most likely cause of the new PC's inability to connect is port security, which can restrict access to specific devices based on MAC addresses. If the new PC's MAC address is not recognized or allowed by the port security settings, it will be denied access. The other options, such as port tagging, aggregation, and mirroring, do not typically prevent device connectivity in this scenario.