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Networking. What are File Servers?. Network – a group of two or more computers connected together for exchanging data/information and sharing resources File Server – centralized computer used for storing (and sharing) programs and files.

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PowerPoint Slideshow about 'Networking' - Sharon_Dale


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Presentation Transcript
what are file servers
What are File Servers?
  • Network – a group of two or more computers connected together for exchanging data/information and sharing resources
  • File Server – centralized computer used for storing (and sharing) programs and files.
    • Examples: Database server, Web server, mail server, general file servers
  • Client-server
    • Client – computer that ‘receives’ data
    • Server – computer that provides services to a client
message
Message
  • A communication that is transferred from one node on a network to another.
    • E-mail
    • Web Pages
    • FTP (File Transfer Protocol)
networks
Networks
  • Bandwidth
    • Amount of data that can be transmitted across transmission medium in a certain amount of time
  • Packet
    • Data (Web pages, e-mail messages, etc.) is transmitted in bundles called packets
      • Header
        • Sender’s IP address
        • Receiver’s IP address
        • Protocol
        • Packet Number
      • Data
expansion of networks
Expansion of Networks
  • Variations in degree to which networks are used
    • Busy during day, quiet at night
  • To keep demand low on networks, many organizations maintain separate small networks and connect those networks
expansion of networks6
Expansion of Networks
  • Pass messages between networks

The Internet

PC

PC

Switch

PC

Router

PC

Switch

PC

PC

firewall guard against external threats
Firewall – Guard Against External Threats
  • Acts as a barrier between your system and outside world
  • Ports provide application-routing information for every message
    • 21 (FTP)
    • 25 (E-mail)
    • 80 (HTTP)
    • 12345 (NetBus – Trojan) *Block*
  • Firewall screens ports
    • Norton Internet Security
    • McAfee Internet Security
    • Windows XP (blocks only incoming traffic)
wireless technology9
Wireless Technology
  • Access Point
    • Computer connected to the Internet (acts as intermediary)
    • Name is SSID (example: RoyalAir, RoyalGuest) (to broadcast or not to broadcast?)
      • Microsoft\'s Answer
    • Usually users able to configure security features
  • Wireless Router– attaches to access point computer
  • Beacon
    • Repeating of identifying information by access point
    • Example: on a 2.4 GHz radio frequency band
  • Association – Portable wishes to make connection
  • Radio waves or infrared signals used to communicate with access point
    • As portable computers move, interact with new access point
    • If no computers have direct access to the Internet, portable computers still can interact with each other, but not with the Internet
wireless technology10
Wireless Technology
  • Wireless communications
    • Messages are divided into packets
    • Packet contains a header
      • IDs which machine is to receive the data
    • Infrared signals or radio waves
    • All wireless computers in an area share the airwaves, receive the same messages and determine if they are the recipient
      • 802.11b (11 Mbps max. data rate)
      • 802.11g (54 Mbps max. data rate)
      • 802.11n (600 Mbps max. data rate)
      • Maximum range: varies – about 300 feet
      • Indoor range less than outdoor (less interference)
    • Bluetooth (1-3 Mbps DTR / range 10 meters)
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