Computer Networks Lecture 4-5

Study Notes

A computer network is a set of computers connected together to share resources, with the most common resource being an internet connection.
Other shared resources include printers, file servers, and more.
The Internet itself can be considered a computer network.

Computers on a network may be linked through cables, telephone lines, radio waves, satellites, or infrared light beams.
Devices are interconnected based on hardware, and communication is facilitated through software.

File sharing: sharing files between devices on a network.
Resource sharing: sharing resources such as printers, servers, and more.
Communication and collaboration: enabling communication and collaboration between devices and users.
Remote access: allowing users to access devices and resources remotely.
Data protection: protecting data from unauthorized access and misuse.

Routers: receive and send data on computer networks, combining the functions of hubs, modems, and network switches.
Gateways: nodes in a computer network that regulate traffic between dissimilar networks.
Repeaters: devices that extend the coverage area of a WiFi network by receiving, amplifying, and transmitting the signal.
Bridges: devices that connect two or more different LANs with similar protocols, providing communication between devices.
Hubs: physical layer networking devices that connect multiple devices in a network, used to connect computers in a LAN.

Personal Area Network (PAN): a small network consisting of a wireless modem, computer, phones, printers, and tablets, revolving around one person in one building.
Local Area Network (LAN): a network that connects groups of computers and low-voltage devices together across short distances to share information and resources.
Wireless Local Area Network (WLAN): a network that uses wireless network technology, such as Wi-Fi, to connect devices without the need for physical cables.