Networks are a communication system between computers and other devices that allows data to be exchanged. You must know the basic concepts and terms of networking, such as: The OSI model is a standard model that describes seven layers of networking: physical, data link, network, transport, session, presentation, and application. Protocols are a set of rules and formats for exchanging data between devices on a network. The most well-known protocols are TCP/IP, HTTP, FTP, SMTP, and DNS. Addressing is a way of identifying devices in a network. The most common types of addressing are IP addresses and MAC addresses. Routing is the process of determining the path of data transmission between devices in a network. The main devices for routing are routers and switches. Filtering is the process of controlling access to data in a network. The main devices for filtering are firewalls and proxy servers.
