A network tap (Test Access Point) is a device used for monitoring network traffic. It allows the technician to passively observe the traffic between two network nodes in real-time without introducing latency or affecting the network's performance. By using a network tap, the technician can analyze the data packets flowing through the network to identify if packet loss is occurring, which could be contributing to the slow network traffic in the branch office.

802.11ac is the 802.11 standard that supports both 5GHz and 2.4GHz channel frequencies. 802.11ac is the latest wireless networking standard that operates in both the 5GHz and 2.4GHz frequency bands. It provides higher wireless network speeds and better reliability compared to previous standards, such as 802.11a,
802.11b, and 802.11g. The 802.11a standard operates exclusively in the 5GHz band, while the 802.11b and
802.11g standards operate exclusively in the 2.4GHz band.

Explanation
The appropriate connection types for connecting an external keyboard to an Android tablet are USB-C and Bluetooth123.