* The most likely cause of the problem is that the switch port that the new PC is connected to is configured with port security, which is a feature that limits the number of MAC addresses that can be learned on a port.
* Port security can prevent unauthorized devices from accessing the network by either shutting down the port or dropping the traffic from the unknown MAC address.
* Since the existing PC operates normally, it means that its MAC address is already authorized on the switch port, but the new PC's MAC address is not.
* Therefore, the technician should contact the network team to either disable port security on the switch port or add the new PC's MAC address to the authorized list.
* This will allow the new PC to get an IP address on the client's VLAN and access the network resources.
* The other options are not relevant to the situation, as they do not address the root cause of the problem.
* Option B is incorrect because creating a record in DNS for the new PC will not help it get an IP address or connect to the network.
* Option C is incorrect because reviewing the logs on the company's SIEM will not fix the port security issue or restore the network connectivity for the new PC.
* Option D is incorrect because checking NetFlow data from the connected switch will not identify or resolve the port security issue or the network issue for the new PC.
References:
* : CompTIA Network+ N10-008 Study Guide, Chapter 3, Section 3.4, "Port Security", page 147-148.
* : Professor Messer's CompTIA N10-008 Network+ Course Notes, Section 3.4, "Port Security", page 30.
* : CompTIA Network+ N10-008 Study Guide, Chapter 2, Section 2.3, "DNS Concepts", page 79-80.
* : CompTIA Network+ N10-008 Study Guide, Chapter 6, Section 6.2, "SIEM", page 316-317.
* : CompTIA Network+ N10-008 Study Guide, Chapter 5, Section 5.1, "NetFlow", page 262-263.