Final answer:
An internetworking unit that connects somewhat dissimilar communications aspects is a gateway, which facilitates communication between different protocols or systems.
Step-by-step explanation:
An internetworking unit that connects with somewhat dissimilar communications aspects is a gateway. This device functions as a translator between systems that use different communication protocols, data formats, or languages. A gateway can connect networks that use different protocols or provide a connection to a service provider from an internal network.
In contrast to a gateway, a router directs data packets within or between networks, a modem converts digital signals to analog for transmission over telephone lines and vice versa, and a hub acts as a simple connection point for devices in a network.