If the default gateway is configured incorrectly, what is the effect on network communications?

When the default gateway is configured incorrectly, the primary consequence is that the host cannot communicate with remote networks. The default gateway is essential for routing traffic destined for networks outside of the host's local subnet. If the gateway is misconfigured, the host remains capable of sending and receiving data with devices on the same local network, as this communication does not require the default gateway. However, any attempt to reach external networks or devices outside the local subnet would fail since there would be no proper route for the traffic to take.

This understanding highlights the importance of the default gateway in managing outbound traffic, as it serves as the access point for the host to communicate with devices that reside on different networks.