Answer :
Final answer:
The best solution to isolate collision domains and enable gigabit Ethernet is to replace the hub with a switch, which offers dedicated bandwidth and supports higher speeds.
Explanation:
To upgrade the company's hub to isolate collision domains from each other and allow for gigabit Ethernet, the most appropriate solution would be A) Replace the hub with a switch. This is because switches are designed to provide dedicated bandwidth to each port, effectively creating separate collision domains for each connected device, which reduces network congestion and improves performance. Additionally, modern switches are capable of supporting gigabit Ethernet speeds, unlike hubs which are typically limited to 10/100 Mbps speeds and share bandwidth between all ports, thus they do not isolate collision domains.
