What limitation might explain why only 50 clients can connect to the Internet through the trusted network?

The reason why the limitation of 50 clients can connect to the Internet through the trusted network is predominantly linked to the DHCP address pool on the trusted interface having only 50 IP addresses available. In networking, the DHCP (Dynamic Host Configuration Protocol) is responsible for assigning IP addresses to devices on a network. If the DHCP pool is limited to 50 IP addresses, this would inherently cap the number of devices that can simultaneously receive an IP address and connect to the Internet via that network to the same number—50 clients in this case.

When the DHCP address pool is exhausted, any additional clients attempting to connect would not receive an IP address and therefore would be unable to access network resources or the Internet. This scenario illustrates a crucial capability of network management, emphasizing that the size of the DHCP pool directly influences the number of connected clients. Other factors like feature keys or outgoing policies do not limit the number of clients in this specific context, as they primarily pertain to other functionalities or configurations of the device.