Computer Networks Devices and Services

Virtual Practice Lab
Practice Test
Computer Networks Devices and Services

Computer Networks Devices

  • Network Interface Card (NIC)
    • The card connected to the motherboard from one side and connected to the network cable from the other side
    • Network adapter
    • Interface between PC and the network cable
    • Resides inside the motherboard of PC
    • Communicate with PC through the device driver
    • Contain transmitter/receiver
      • Transceiver
    • Wired or wireless (via antenna)
  • Hub
    • Shares frames between machines
    • Number of ports to connect several machines
    • Work with full duplex communication
    • Mixture of speeds (10m, 100m, 1g, etc)
    • Allow collisions
      • Hub is one collision domain
      • Hub is one broadcast domain
      • Collisions make the network slow and congested
  • Switch
    • Forward and filter frames
    • Work with full duplex communication
    • Mixture of speeds
    • One broadcast domain
    • Each port is a separate collision domain
    • No collisions
    • No sniffing
  • Access Point (AP)
    • Connects machines wirelessly in LAN
    • Transmits frames in the air media
    • Links wireless part to wired infrastructure
    • One broadcast domain
    • One collision domain
    • Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA)
  • Router
    • Redirects packets between networks
    • Works based on a routing table
    • Divides network into broadcast domains
    • Divides network into collision domains
  • Computer Network (LAN) Services
    • Software Resources Centralization
      • Files
      • Databases
      • Applications
    • Hardware Peripheral Sharing
      • Printer
      • Scanner
      • Processor
      • Storage
  • Computer Network (WAN) Services
    • Web Services
      • Web browsing
      • Web searching
      • Social media
    • Email exchanging
    • File transfer
    • Voice calls
    • Video conferencing


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