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Networking PowerPoint PPT Presentation


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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Networking

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Networking l.jpg

Networking


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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


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Message

  • A communication that is transferred from one node on a network to another.

    • E-mail

    • Web Pages

    • FTP (File Transfer Protocol)


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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


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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


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Expansion of Networks

  • Pass messages between networks

The Internet

PC

PC

Switch

PC

Router

PC

Switch

PC

PC


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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)


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Wireless Technology


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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


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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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