To improve wireless network security in a crowded office building, what should the technician do?

Reducing the transmit power of a wireless access point is an effective way to enhance wireless network security, especially in a crowded office building. By lowering the transmit power, the wireless signal is confined to a smaller area, making it less likely to be accessible from outside the building. This reduces the risk of unauthorized users being able to connect to the network from adjacent locations or nearby public spaces.

In environments with high density, such as office buildings, stronger signals may extend beyond the intended geographic boundaries, increasing vulnerabilities to attacks or unauthorized access. Therefore, by controlling the signal range through power reduction, the technician can help to limit access to only those users within the premises.

Implementing WPA encryption, while important for securing the data transmitted over the network, does not prevent unauthorized users within range from connecting if they have the proper credentials. Disabling the DHCP server would disrupt the automatic assigning of IP addresses to devices on the network, which can hinder connectivity. On the other hand, enabling QoS management is more about prioritizing bandwidth for certain applications and does not provide direct security enhancements. Thus, while all these options contribute to improving network management and security in various ways, reducing transmit power specifically addresses the concern of limiting the wireless coverage area.