Answer :
Replacing the hub with a switch is the best solution to isolate collision domains and support Gigabit Ethernet. Thus, option (A) is correct.
- Switches: Unlike hubs, switches operate at Layer 2 and use a MAC address table or **switching table** to learn and remember where devices are connected. This helps in isolating collision domains, as each port on a switch represents a separate collision domain.
- Gigabit Ethernet Support: Modern switches support Gigabit Ethernet, which meets the technician's requirement for higher-speed connectivity.
- Collision Domain Isolation: By using a switch, each device connected to the switch gets its dedicated bandwidth segment, effectively isolating collision domains and reducing network collisions.
Options like implementing VLANs and upgrading the hub's firmware may add some benefits, but they do not provide the fundamental upgrade from a shared medium (hub) to a dedicated one (switch) that isolates collision domains and supports Gigabit Ethernet.
