An engineer must perform a Layer 2 survey for a mining facility.

For a Layer 2 survey in a mining facility, particularly in a mine shaft, a patch antenna is the most suitable choice. Patch antennas are directional and can be used to focus the signal in a specific direction, which is ideal for the long and narrow structure of a mine shaft. This type of antenna can help in providing better coverage and signal strength in challenging environments like mines. References: CCNP Enterprise Wireless Design ENWLSD 300-425 and Implementation ENWLSI 300-430 Official Cert Guide