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The default gateway is the TCP/IP configuration parameter that identifies the router used to reach hosts on remote networks. When a device needs to communicate with a host that is not on its local subnet, it sends the data to the default gateway. The default gateway serves as an access point or IP router that the device sends its outbound traffic to when the destination address is outside of its local subnet. This configuration allows for proper routing of packets to external networks or the internet, ensuring connectivity beyond the local network.

The other choices do not serve this function. The subnet mask is used to determine the local subnet of the device and helps in identifying which part of the IP address refers to the network and which part refers to the host. The DNS server is responsible for resolving domain names to IP addresses; it does not play a role in identifying a router for remote network connections. The IP address is the unique identifier assigned to the device on the network, but it does not specify a gateway for routing purposes.