Chapter 6 wireless network review

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Oct 30, 2023

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46. **Why is it not advisable for an access point to always use its maximum power for broadcasting wireless signals?** Each access point should adjust its power level, which determines the signal strength it emits, to match the specific geographic area it covers. Using excessively low power levels can result in dropped signals as clients move to the outer edges of the access point's range. Conversely, using maximum power levels can lead to significant signal overlap between access points, causing clients from other coverage areas to connect with access points that are farther away but broadcasting a stronger signal. 47. **In what situations might the use of an omnidirectional antenna not be the best choice?** While omnidirectional antennas might seem like a good choice for widespread Wi-Fi coverage, there are situations where using unidirectional antennas can provide better signal availability. For instance, if a company installs an omnidirectional antenna near the high ceiling of a factory, the spherical signal it emits might only benefit workers who can stand on the ceiling, which is impractical. Unidirectional antennas can be mounted higher and directed downward to create a dome-shaped coverage, ensuring the signal reaches the desired areas without wasting it where it's not needed. 48. **What is the distinction between war driving and war chalking in the context of wireless network hacking?** War driving involves hackers actively searching for vulnerable wireless networks by driving around with devices configured to intercept wireless data transmissions. Once they identify such networks, they might engage in war chalking, where they publicly mark the locations of these networks by drawing symbols with chalk on sidewalks or walls. These symbols, inspired by the markings used by hobos to indicate hospitable locations, convey information about the access point's SSID and whether it's secured. Some websites also provide maps of these open networks, as reported by war drivers. 49. **How does configuring wireless clients for enterprise wireless access differ from a standard setup?** In an enterprise environment, configuring clients for wireless network access typically involves a more intricate two-step process. The first step is on-boarding, where users or network technicians install a specific agent app on the device (e.g., smartphone, laptop, tablet) to grant trusted access to certain parts of the network. This controls the device's permissions for services such as email, file sharing, and specific network administrative functions. The second step is off-boarding, which allows network administrators

to remotely remove the agent in case of device loss or theft. This process, known as a remote wipe, clears the device of network access and sensitive information. 50. **Why is it recommended to avoid using the WPS PIN feature if possible?** WPS (Wi-Fi Protected Setup) is a user-friendly but not very secure feature found on some consumer- grade access points. It involves using a PIN (personal identification number) to access the access point's settings or associate a new device with the network. However, the WPS PIN can be easily cracked through brute force attacks, where an attacker tries numerous character combinations to discover the correct PIN. This can compromise the network's WPA2 key, making it less secure.

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