Answer :
Final answer:
To isolate collision domains and upgrade to Gigabit Ethernet, the best solution is to replace the hub with a switch, as it logically separates network traffic per port, enhancing efficiency and allowing for faster speeds.
Explanation:
A network technician looking to upgrade the company's hub to isolate collision domains and allow for Gigabit Ethernet should choose the option to replace the hub with a switch. This is because hubs broadcast data to every port, causing potential data collisions in a network, and do not isolate traffic between ports.
In contrast, a switch logically separates the network into multiple collision domains, where each port has its own segment of network traffic, therefore isolating each collision domain and increasing the overall network efficiency and performance, particularly important when moving to higher speed networks such as Gigabit Ethernet.
