Point to point connection
Dedicated
A point-to-point connection is a direct link between two devices or systems, allowing data to be exchanged between them. It provides a dedicated communication channel without the need to share resources with other devices or systems, offering a secure and efficient way to transmit information. Examples include Ethernet connections between two computers or a serial connection between two routers.
A dedicated link between devices
A hardware connection means a physical link established between devices.
Internet connection sharing is when a device that has access to the internet provides and shares the connection with other devices. ICS is a Microsoft service.
Authentication is the term for establishing a connection between any two Bluetooth devices.
The Access Layer
WiFi is wire-less internet connection, and it provides connection to the internet on many computers at once. WiFi does not affect anything, except for the fact it provides internet to your computer, or other wireless devices.
Ethernet is a type of wired connection used for transferring data between devices on a network. It involves the use of cables to create a physical connection between devices.
Wi-Fi
An isochronous connection is a path between two devices over a predetermined list of wireless channels. Bluetooth uses this type of connection to deter the amount of interference received as well as created. The basic idea of this connection type is that two devices will cycle between channels a-f, and repeat.
For a direct network connection between two devices you need a cross-over cable.