Network Hardware

• What is the purpose of a modem?

  Transforms digital information to analog signals
• How does a modem work?

  By modulating and demodulating electrical signals
• What ports do standalone modems typically have?

  One for outside world, one Ethernet port
• Where does a modem connect on a router?

  To the port labeled wide area network
• What do most internet service providers provide today?

  A single device that is both modem and router
• What are the three most popular wired cable types?

  Twisted pair, coaxial, and fiber optic
• What is a twisted pair cable made of?

  A pair of insulated copper wires
• What is a disadvantage of twisted pair cables?

  They can be affected by external noise
• What are coaxial cables made of?

  Four cylindrical components including a conductor
• What are fiber optic cables made of?

  Very thin optical fibers, glass or plastic
• What is the primary function of a network interface card (NIC)?

  Allows a computer to connect to a network
• How does a wireless access point connect to a network?

  Via an Ethernet cable to a router
• Why do businesses use multiple wireless access points?

  To ensure full coverage and signal strength
• What is the function of a hub in a network?

  Connects multiple devices to one network
• What is a disadvantage of using a hub?

  It can flood the network with traffic
• How does a switch differ from a hub?

  A switch routes data to the correct device
• What layer does a switch operate on?


  The data link layer
• Why are switches typically faster than hubs?

  They can inspect and route transmissions
• What are the key network hardware components needed to connect to a network?

  • Modem
  • Router
  • Network Interface Card (NIC)
  • Wireless Access Point
  • Hub
  • Switch
  • Cables (Twisted Pair, Coaxial, Fiber Optic)