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CCNA. CCNA ( Cisco Certified Network Associate) is an entry-level information technology (IT) certification offered by Cisco Systems. CCNA certification is widely recognized in the IT industry as the foundational step for careers in IT positions and networking roles. [ 1][ 2] Cisco exams routinely change in response to evolving IT trends. [ 3]
Linux systems adhere to POSIX, [87] SUS, [88] LSB, ISO, and ANSI standards where possible, although to date only one Linux distribution has been POSIX.1 certified, Linux-FT. [89] [90] Free software projects, although developed through collaboration, are often produced independently of each other. The fact that the software licenses explicitly ...
Network architecture. Network architecture is the design of a computer network. It is a framework for the specification of a network's physical components and their functional organization and configuration, its operational principles and procedures, as well as communication protocols used. In telecommunication, the specification of a network ...
An internetwork is the connection of multiple different types of computer networks to form a single computer network using higher-layer network protocols and connecting them together using routers. The Internet is the largest example of internetwork. It is a global system of interconnected governmental, academic, corporate, public, and private ...
A server is a computer that provides information to other computers called "clients" on computer network. [ 1] This architecture is called the client–server model. Servers can provide various functionalities, often called "services", such as sharing data or resources among multiple clients or performing computations for a client.
1. Physical layer. The Open Systems Interconnection ( OSI) model is a reference model from the International Organization for Standardization (ISO) that "provides a common basis for the coordination of standards development for the purpose of systems interconnection." [ 2] In the OSI reference model, the communications between systems are split ...
A computer is a machine that can be programmed to automatically carry out sequences of arithmetic or logical operations ( computation ). Modern digital electronic computers can perform generic sets of operations known as programs. These programs enable computers to perform a wide range of tasks. The term computer system may refer to a nominally ...
The PLATO system was launched in 1960 at the University of Illinois and subsequently commercially marketed by Control Data Corporation.It offered early forms of social media features with innovations such as Notes, PLATO's message-forum application; TERM-talk, its instant-messaging feature; Talkomatic, perhaps the first online chat room; News Report, a crowdsourced online newspaper, and blog ...