About Grubhub. Grubhub helps you find and order food from wherever you are. How it works: you type in an address, we tell you the restaurants that deliver to that locale as well as showing you droves of pickup restaurants near you. Want to be more specific? Search by cuisine, restaurant name or menu item.
The main purpose of a router is to connect multiple networks and forward packets destined either for its own networks or other networks. A router is considered a Layer 3 device because its primary forwarding decision is based on the information in the Layer 3 IP packet, specifically the destination IP address.
The router is the key piece of equipment in a wireless network. Only the router is physically connected to the internet by an ethernet cable. The router then broadcasts the high-frequency radio signal which carries data to and from the internet. The adapter in whatever device you are using both picks up and reads the signal from the router, and also sends data back to your router and on to the internet, an upstream and downstream activity.