Final answer:
A node on a computer network communicates with a node on another network by sending the packet to its default gateway.
Step-by-step explanation:
Whenever a node needs to communicate with a node on another computer network, something that is outside its local subnet, it will know that it needs to send the packet to its default gateway.
A default gateway is a device in a computer network that serves as an access point to another network.
It acts as an intermediary for sending and receiving data packets between different networks.
For example, if a computer on a local subnet wants to access a web server on the internet, it will send the packet to its default gateway, which will then forward it to the appropriate destination on the internet.