A router.
smtp, http, anything on that specific OSI layer.
fer'abd;lb,b,teabfd
A Switch is a Layer 2 device as they operate in the data link layer
A good example of an input and output device is a touchscreen monitor.
A router can be used to connect a LAN to the internet. A router works on the basis of an IP address. Every router has built-in operating system known as IOS. A router works on the network layer of the OS model and it routes the data towards the optimal path. Router uses the header information of the packets and forwarding table to define the best shortest possible path of the data.
Router works in Network Layer of OSI model
The easiest example of how cloud computing works is the Kindle e-reader. As for how the application works it is an off site vendor who stores all your information and software and you use the internet to access it.
fourth layer
physical layer
transport layer
A firewall generally works at layer 3 and 4 of the OSI model. Layer 3 is the Network Layer where IP works and Layer 4 is the Transport Layer, where TCP and UDP function. Many firewalls today have advanced up the OSI layers and can even understand Layer 7 - the Application Layer.
It is a very simple device it is a touch screen you can download apps you can surf the Internet ect. In other words it's a handheld computer