revision

revision

1. network security

   • Network security consists of the policies and practices adopted to prevent and monitor unauthorized access, misuse, modification, or denial of a computer network and network-accessible resources.

2. Hardware

   • RAM
     • RAM (pronounced ramm) is an acronym for random access memory, a type of computer memory that can be accessed randomly; that is, any byte of memory can be accessed without touching the preceding bytes. RAM is found in servers, PCs, tablets, smartphones and other devices, such as printers.
   • Computer hardware are the physical parts or components of a computer, such as the central processing unit, monitor, keyboard, computer data storage, graphic card, sound card and motherboard.

3. Networks

   • LAN/WAN/WPAN
     • LAN
       • A local-area network (LAN) is a computer network that spans a relatively small area. Most often, a LAN is confined to a single room, building or group of buildings, however, one LAN can be connected to other LANs over any distance via telephone lines and radio waves.
     • WAN
       • A wide area network is a telecommunications network or computer network that extends over a large geographical distance/place. Wide area networks are often established with leased telecommunication circuits.
     • WPAN
       • A WPAN (wireless personal area network) is a personal area network - a network for interconnecting devices centered around an individual person's workspace - in which the connections are wireless.
   • Network
     • computer network
       • A computer network is a set of computers connected together for the purpose of sharing resources. The most common resource shared today is connection to the Internet. Other shared resources can include a printer or a file server. The Internet itself can be considered a computer network.
     • network computer
       • A computer with minimal memory, disk storage and processor power designed to connect to a network, especially the Internet. The idea behind network computers is that many users who are connected to a network don't need all the computer power they get from a typical personal computer.

4. LAN HARDWARE

   • ROUTER
     • explanation
       • a device which forwards pack of products to the appropriate parts of a computer network
   • ethernet cable
     • An Ethernet cable sometimes carries the broadband signals between your modem, router, computer, and other wired Internet-capable devices. Ethernet cables are capable of accommodating the speeds associated with all levels of Internet service.