The most common sensors installed in a data center to monitor environmental issues include: Temperature Sensors: These sensors monitor the ambient temperature within the data center. Maintaining an optimal temperature is crucial for the proper functioning of servers and other equipment. Humidity Sensors: These sensors measure the humidity levels. High humidity can cause condensation, leading to equipment damage, while low humidity can cause static electricity buildup. Reference: 1: CompTIA Network+ Certification Exam Objectives (N10-008)