A network hub connects devices together on a single computer network.
The data received from a port is sent to all available ports.
Network hubs do not manage any traffic coming through them; they only broadcast — or repeat.
A network switch connects devices together on a single computer network just like a Hub.
The switch knows the IP addresses of each device connected to it’s ports, and when it receive data from device1 (connected to port2 of the switch) addressed to device2 (connected to port4 of the switch), it will forward that data that it received from the port of device1 to only the port of device2.
(It received data from port 2 and sent that data to port 4), and not to all the available ports such as in the case of a HUB.
An Access Point (AP) is a device that creates a Wireless Local Area Network, or WLAN.
An access point connects to a wired router, switch, or hub via an Ethernet cable, and projects a Wi-Fi signal to a designated area enabling wireless access from devices via the AP into the existing static wired LAN.
A network bridge joins two separate computer Local Area Networks (LAN) to enable communication between them and allow them to work as a single network and not as two separate networks.
A WiFi Bridge can link your network to another network so that resources like Internet can be shared.
Bridging devices work together in pairs so you will need two units.
One unit is placed at each network.
When a WiFi connection is established between both bridging units then the two networks become one.
A router is a device that routes data from a device (such as your local computer or cell-phone) connected to the router on one network to a device (such as your Service Providers WEB-SERVER or MAIL-SERVER) on another network.
Example. Assume we have a router connected between your Local Area Network (LAN) and the internet.
The router will route data that it received from the LAN to the internet, and it will route data received from the internet to the LAN. (Never did the router connect the LAN to the internet, and never were internet connected to the LAN.)
At no stage was your infrastructure such as printers, or DVR or other computers on your own network shared for access to the internet or vica versa.
It is something like (it act as a mailman). What he received from one network, it delivers to the other network and vice-versa.