Answer:
We don't need to know the exact IP addresses for the devices that we use because our devices use a network such as the internet to communicate with each other, and the network itself is responsible for routing the data between devices using their IP addresses. When we use our devices to access a network, the network assigns our device a temporary IP address, which is used to identify and communicate with our device within the network. This means that we only need to know the IP address of the network itself, rather than the specific IP addresses of all the devices that we use.