What capability do the 2800 series routers have regarding connectivity?

The selected answer highlights the capability of the 2800 series routers to offer built-in dual Fast Ethernet or Gigabit Ethernet ports, which are essential for providing network connectivity. This feature allows for flexibility in connecting various devices and enables efficient data transfer rates, important for both small and medium-sized business environments. These routers can accommodate a range of network speeds suitable for different operational requirements, enhancing their adaptability in various network configurations.

In contrast, the alternative options do not accurately represent the capabilities of the 2800 series. For example, although fiber optic connections can be utilized in conjunction with these routers, they are not limited to fiber optic networks exclusively. The assertion that the routers support only IPv4 protocols is also incorrect; they are capable of supporting both IPv4 and IPv6, providing greater versatility in modern networking scenarios. Lastly, claiming that none of the other options apply fails to recognize the available connectivity offerings of the 2800 series, which is accurately described in the correct choice.