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• computer networks are a group of two or more computers connected to each other for sharing resources and information
• types of computer network

  -LAN

  -MAN

  -WAN
• LAN(Local Area Network)
• MAN (Metropolitan Area Network)
• WAN (Wide Area Network)
• LAN - Local Area Network - A network that connects computers within a small geographical area. Such as home, building, office, and school
• MAN - Metropolitan Area Network - A network that connects two or more LANs together. In a city of town
• WAN - Wide Area Network, a network that connects two or more networks over a large geographical area. Such as country or the world
• Router: a device that forwards data packets to the appropriate parts of a computer network. A router is connected to at least two network and its internet service provider network
• Switch - A device that filters and forwards packets between LAN segment
• Wireless Access Point (WAP) - A device that allows other Wi-Fi devices to connect to a wired network.
• Modem - A device that converts data into a format suitable or a transmission medium so that it can be transmitted from one computer to another.
• Patch panel - A bundle multiple network ports together to connect coming and outgoing lines including those for local area networks, electronics, electrical systems and communications.
• Network cables are used to connect one network device to other network devices or to connect two or more computers to share printers, scanners etc..
• Unshielded Twisted Pair (UTP) Cable - A popular type of cable that is commonly used for Local Area Network. It has two unshielded wires twisted around each other.
• Shielded Twisted Pair (STP) Cable - The extra covering of the STP Cable provides extra protection to prevent electromagnetic interference.
• Coaxial Cable - This cable commonly used in television industries. The metal shield surrounding the cable helps block interference from fluorescence lights, motors, and other computers.
• Fiber Optic Cable - Transmits light rather than electronic signals which reduce the risks of electrical interference. It is ideal for environments where electrical interference is present.
• Network architecture - Refers to the way network devices and services are designed to serve the connectivity needs of client devices.
• Peer-to-peer network - This consists of two or more computers share files and access to devices such as printers without requiring a server computer.
• Client/server network - A computer network in which one centralized, powerful computer (called the server) is a hub to which many less powerful personal computers or workstations (called clients) are connected. The clients run programs and access data that are stored on the server.
• Network Devices - Devices are required for communication and interaction between hardware on a computer network.
• Types of network of cable

  • Unshielded Twisted Pair (UTP) Cable
  • Shielded Twisted Pair (STP) Cable
  • Coaxial Cable
  • Fiber Optic Cable
• Types of Network architecture

  • Peer-to-peer network
  • Client/server network
• types of Network Devices

  • Router
  • Switch
  • Modem
  • Patch Panel
  • WAP - Wireless Access Point
• advantage and disadvantages of client server network

  A) secure

  B) performance

  C) centralized

  D) reliable

  E) professional

  F) intensive

  G) software

  H) expensive dedicated

  
• advantage and disadvantage of peer to peer

  A) less

  B) harware

  C) easy

  D) NOS

  E) redundancy

  F) setup and low cost

  G) secure

  H) storage

  I) resource sharing

  J) maintain

  
• Network Materials

  • Twisted-pair cable
  • RJ45
  • Modular jack
• Network tools and Testing device

  • Crimping tool
  • Wire Cutter and Stripper
  • Punch down tool
  • LAN Tester
• Twisted-pair cable - are cables that are specifically used to networking.
• RJ45 - a connector attached to the end of a twisted pair cable.
• Modular jack - a unique locking system that prevents accidental unplugging resulting from shock and vibration.
• Crimping tool - this is a special tool used to cut, hold, and attach and RJ45 jack to the end of the cable.
• Wire Cutter and Stripper - use to cut and strip for matching different cable sizes.
• Punch down tool - use to connect network wires to a patch panel and modular jack.
• LAN Tester - an electronic device used to verify the connections in a signal cable assembly.