Direct answer
Cat6 is suitable for many residential Ethernet runs and supports common gigabit applications. Cat6A is designed for 10-gigabit operation across the full standard channel distance with stronger control of alien crosstalk, but it is thicker and demands compatible pathways, terminations, and workmanship. Fiber is useful between buildings, for long backbones, where electrical isolation matters, or where unusually high future bandwidth is expected.
Fiber does not replace copper everywhere because many home devices use Ethernet and Power over Ethernet. Cable category alone does not guarantee performance: bend radius, separation from power, connectors, patch cords, testing, and the installed topology matter. In new construction, accessible conduit and documented pathways may provide more future flexibility than putting the highest category everywhere without a plan. See CEDIA's structured-cabling guidance.
Sources and technical references
Use the organizations responsible for a product, platform or standard to confirm current specifications and compatibility.
How this answer was prepared
Camelback Smart Homes publishes this FAQ library for homeowners, design professionals, builders and property teams comparing integrated technology. Answers begin with the practical conclusion, then explain the factors that can change it.
Limitations: This is general educational information, not a site-specific design, quote, code determination or compatibility guarantee. Final requirements depend on the property, construction, infrastructure, equipment versions and project goals.