Answer:
The engineer installed a Bridge
Explanation:
A bridge is a networking device that serves as a link between two or more networks, therefore, making them work as a single network. Bridges function in a similar pattern as hubs and repeaters, however, they are distinct. The MAC address table is maintained to adequately direct transmissions to the receiver.
It is worthy to note that bridges operate on the Data link layer of the OSI (Open system Interconnect) model. It connects and maintains communication between multiple networks.
The bridge installed by the engineer creates stability between the two network segments. It optimizes the signal which makes the network perform better.