Router.
A device with wireless connectivity or Ethernet ports, which otherwise connects a series of devices in a network topology.
A layer 3 device such as a router.
Bridge
its a switch
Switch.
The term used to describe connecting a mobile device to another mobile device or computer to share a network connection is "tethering." This process allows one device to share its internet connection with another, typically through USB, Bluetooth, or Wi-Fi. Tethering can be useful for providing internet access to devices that lack their own connectivity.
It is a network adapter whether it is wireless or wired type.
bridge
A switch is a network connectivity device and a host is a computer system (client) on a network.
This device is called a ROUTER. Routers are by default configured to not pass the broadcast traffic to another networks to which it connects. But by some means it could be also a SWITCH - sometimes it can be configured to filter different type of network traffic.
A device with wireless connectivity or Ethernet ports, which otherwise connects a series of devices in a network topology.
Bridge