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Network Slides Network Slides Presentation Transcript

  • Networks Mr Arthur
  • Aims of Lesson 1
    • Introduce networks
    • LANs
    • WANS
    • Transmission Media
    • Client Server and Peer-to-peer networks
  • Stand Alone/Networked
    • A Stand Alone computer system is a computer that is not connected to any other
    • A network is a linked set of computer systems that are capable of sharing programs, data and sending messages
  • Local Area Networks
    • A LAN is a network of computers connected over a small geographical area, usually inside the 1 building
    • Examples
      • School LAN
      • Network in a library
    • Uses
      • Sharing resources
      • Sharing peripherals
      • Email
    • Transmission Media
      • Copper Wire, Fibre Optic and Wireless
  • Wide Area Networks
    • A WAN is a network of computers over a large geographical area, such as across a country or the world.
    • Examples
      • The Internet
      • Companies like the BBC communicating across the world
    • Uses
      • video-conferencing, use of e-mail, live chat
      • Sharing Information - access to databases,
      • E-commerce and entertainment
    • Transmission Media
      • Fibre Optic, Microwave transmission and Satellite
  • Client Server Network
    • A client-server network is where all resources are stored centrally on the server and are assessed by the client stations
    • Advantages
      • Increased security as each user needs to log in
      • Different levels of access are available
      • Users can work on the same document at the same time
      • Flexible uses of station, you can log on to a number of clients and access your files
      • Backup copies are completed centrally
    • Disadvantages
      • If the file server is down there is no access to data
      • More expensive as you need to buy a server and server software
  • Peer to Peer Network
    • A peer-to-peer network is where each station has its own local storage device.
    • Advantages
      • Easier to setup operating systems on stations in a peer-to-peer
      • Cheaper as no server is required
    • Disadvantages
      • No central file storage – users must log in to the same station to access files
      • Users must backup their own data
      • Peer-to-peer is less secure as users may not be required to log in
  • Aims of Lesson 2
    • Last Lesson
    • Introduce networks
    • LANs
    • WANS
    • Transmission Media
    • Client Server and Peer-to-peer networks
    • Today’s Lesson
    • Network Topologies
    • Network Interface Cards
    • Hotspots
  • Star Topology
    • All peripheral nodes are connected to a central node
    • If a peripheral node fails it has no effect on the network
    • If the central node fails the whole network is “down”
      • Advantage = Easy to add new stations
      • Disadvantage = Central node may get congested with network traffic
  • Ring Topology
    • Signals are sent around the network from node to node
    • If a node is faulty, then there must be a method of bypassing the failed node
    • If a communications channel fails, the network fails
  • Bus Topology
    • The bus topology has each node connected to a main communication channel (The Bus)
    • If one node is faulty this has no effect on the rest of the network
    • If the bus is faulty, the whole network is “down”
      • Advantage = Easy to add new stations
      • Disadvantage = Each node may have to compete with each other in order to transmit and receive data
  • Mesh Topology
    • A mesh topology has multiple direct connections between each node
    • The internet is an example of a Mesh network
      • Advantage = A node failure has no effect on the rest of the network
      • Disadvantage = Expensive to set up with a lot of cabling
  • Network Quiz
    • Give 3 functions of a LAN
    • Give 3 transmission media you would associate with a LAN
    • Describe a client server network (2)
    • Give 2 advantages of a client server over a peer to peer network
    • Describe a peer to peer network
  • Aims of Lesson 3
    • Last Lesson
    • Introduce networks
    • LANs
    • WANS
    • Transmission Media
    • Client Server and Peer-to-peer networks
    • Network Topologies
    • Today’s Lesson
    • Network Interface Cards
    • Hotspots
    • Router
    • Hubs
  • Network Interface Cards
    • Network Interface Cards = a small printed circuit board inside the computer system allowing it to communicate with the network.
    • The NIC provides the computer with a unique Media Access Control (MAC) address made up of 6 bytes
  • Hotspots
    • An area where network signals may be received
    • Usually located in built up areas
    • May be deliberate hotspots in a University or may be accidentally created
      • Warchalking
      • Wardriving
  • Router
    • A router is a device which links 2 or more networks
    • The router takes packets of data and decides which route through the network the packet should take
  • HUBs
    • A hub is a device with multiple ports which allows more than 1 device to share the same wire
    • The hub will also boost or amplify signals
    • Multi-port repeater
  • Switch
    • A switch operates like a smart hub
    • The switch separates the network into segments
    • More than one machine can speak at once and only the intended recipients receives the signal
  • Aims of Lesson 4
    • Last Lesson
    • Introduce networks
    • LANs
    • WANS
    • Transmission Media
    • Client Server and Peer-to-peer networks
    • Network Topologies
    • Network Interface Cards
    • Hotspots
    • Router
    • Hubs
    • Today’s Lesson
    • Mainframes/Super computers
    • Current network trends
    • Technical reasons for increasing number of networks
  • Mainframes and Supercomputers
    • Mainframes
    • A large powerful computer which can process a very large amount of data at a high speed
    • May be connected to hundreds of dumb terminals
    • Multi -programming
    • Multi -tasking
    • Multi -processors
    • Supercomputers
    • More powerful than a Mainframe
    • Supercomputers are used for intensive mathematical calculations like weather forecasting, aerospace engineering
  • Current Network Trends
    • Higher Bandwidth
      • Increasing amount of data carried along communications channel
      • Virgin Media advertising 20Mbps!!!
      • There will be a limit however, depending on the distance from subscriber and the telephone exchange
    • Wireless Functions
      • WiFi, Bluetooth, Zigbee
  • Technical Reasons for Increasing Number of Networks
    • Advances in computer hardware
      • Faster, Multiple processors
      • Cheaper, higher capacity RAM chips
      • Increasing Backing storage capacities
      • Increasing data transfer rates
    • Improved Network software
      • Browsers = improved functionality using plug-ins, allowing streamed video, animated graphics to be displayed
      • Operating Systems designed with networking functions built in
  • Final Network Lesson
    • Last Lesson
    • Introduce networks
    • LANs
    • WANS
    • Transmission Media
    • Client Server and Peer-to-peer networks
    • Network Topologies
    • Network Interface Cards
    • Hotspots
    • Router
    • Hubs
    • Mainframes/Super computers
    • Current network trends
    • Technical reasons for increasing number of networks
    • Today’s Lesson
    • File, Print and Web servers
    • Legislation
      • Computer Misuse Act
      • Copyright Designs and patents act
      • Data Protection Act
  • File/Print/Web Servers
    • File Server
      • A file server provides central disk storage for user’s programs and data on the network
      • The file server will run 24 hours a day and must have a fast processor, lots of RAM and much larger hard disk capacity
      • Controls security on the network
      • Backed up using a Digital Audio Tape (DAT)
    • Print Server
      • A print server will allow multiple clients share the same printer
      • The print server will use a spooler program and the printer will probably have a buffer as well
    • Web server
      • A web server is a computer that provides WWW services to a network
      • You have the benefit of “always on” fast access to pages
      • Every computer that host a website must have a web server program
  • Misuse of Networks
    • Copyright Designs and Patents Act
      • This makes it illegal to copy music, programs, movies etc without the permission of the owner
    • Computer Misuse
      • Makes it illegal to hack or spread viruses
    • Data Protection Act
      • Controls the storage of personal information