Which of the following is a common vulnerability in wireless networks?

Unencrypted communication is a common vulnerability in wireless networks because it allows unauthorized users to intercept and access data transmitted over the network. Wireless networks often use radio waves to transmit data, making them susceptible to eavesdropping if the data is not encrypted. If the information shared over the network, such as passwords, personal information, or sensitive corporate data, is not encrypted, it can be easily captured by anyone with access to the same radio frequency range or through various hacking tools. Implementing encryption protocols, such as WPA2 (Wi-Fi Protected Access 2) or WPA3, is crucial to protect the integrity and confidentiality of data transmitted over wireless networks.

The other options touch on aspects related to wireless networks, but they do not directly represent a specific vulnerability like unencrypted communication does. Lack of physical barriers relates more to physical security than to a vulnerability inherent in the wireless technology itself, while limited bandwidth and slow connectivity pertain to performance issues rather than security vulnerabilities.