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  2. AOL online classes FAQs - AOL Help

    help.aol.com/articles/aol-online-classes-faqs

    To watch a class that is on replay, you do not need to do anything. The class will automatically play. To watch a class that is live, click Enter Class. Click Watch Live or Restart Class if the class has already started. To watch an upcoming class, stay on the page until the video begins. Click Watch Previous Class to view the previous class.

  3. CCNA - Wikipedia

    en.wikipedia.org/wiki/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. Cisco exams routinely change in response to evolving IT trends.

  4. Programming language - Wikipedia

    en.wikipedia.org/wiki/Programming_language

    Programming language theoryis the subfield of computer sciencethat studies the design, implementation, analysis, characterization, and classification of programming languages. Definitions[edit] There are a variety of criteria that may be considered when defining what constitutes a programming language.

  5. OSI model - Wikipedia

    en.wikipedia.org/wiki/OSI_model

    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 into seven ...

  6. Computer hardware - Wikipedia

    en.wikipedia.org/wiki/Computer_hardware

    Types of computer systems Personal computer Basic hardware components of a personal computer, including a monitor, a motherboard, a CPU, a RAM, two expansion cards, a power supply, an optical disc drive, a hard disk drive, a keyboard and a mouse Inside a custom-built computer: power supply at the bottom has its own cooling fan

  7. Computer programming - Wikipedia

    en.wikipedia.org/wiki/Computer_programming

    Computer programming or coding is the composition of sequences of instructions, called programs, that computers can follow to perform tasks. [1] [2] It involves designing and implementing algorithms, step-by-step specifications of procedures, by writing code in one or more programming languages. Programmers typically use high-level programming ...

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