Which type of attack do network administrators not have control over preventing?

Physical attacks are those that involve tangible actions against hardware, infrastructure, or facilities, which network administrators typically cannot prevent through technical controls or software solutions alone. While network security measures can protect the network from various logical, reconnaissance, and access attacks (which can be addressed through firewall configurations, intrusion detection systems, access controls, and so forth), physical attacks require more robust security measures like surveillance, security personnel, and physical barriers.

In contrast, logical attacks involve exploiting vulnerabilities within software or systems, reconnaissance attacks involve gathering information to exploit vulnerabilities, and access attacks focus on unauthorized entry into systems or networks. These types of attacks can all be managed or mitigated through administrative, technical, and operational controls that network administrators implement. Therefore, the nature of physical attacks makes them a significant area where administrators have limited control and require different strategies for protection.