Networking

Networking

1. Network Hardware

   • Nodes
   • Network Interface Cards
   • Connecting devices
     • Cables
       • Coxial Cable
       • Twisted-Pair Cable
         • Shielded
         • Unshielded
       • Fibre Optic Cable
         • Pulses of light
     • Switches
       • Boost signal coming in to them
       • Sends signal on
     • Router
       • Connected to different networks that use the same protocols
       • Uses IP addresses to locate the best path for data packets

2. LAN Topologies

   • Star
     • Switch/Hub
       • NIC
         • Cable
       • NIC
       • NIC
   • Bus
     • Node
       • Cable
         • Node
           • Cable
             • Terminator
   • Ring
     • Node
       • Node
         • Node

3. Media Access Methods

   • CSMA/CD
     • Carrier Sense Multiple Access/ Collision Detection
     • Sends out jam signal if it detects one in the topology
       • Lets other nodes know not to communicate
   • Token Ring
     • Circulating piece of code = token
     • Nodes attach data and receiver to token
     • FDDI
       • Uses light to transmit data
       • Fibre Distributed Data Interface
       • 100 megabits per second
       • Used as 'backbone' for copper-cabled network segments

4. Wireless LANs

   • Reasons for WLANs
     • Temporary connections to an existing network
     • Provide portability
     • Backup an existing network
     • Extend networks beyond cable connectivity
   • Wireless Access Points
   • Hotspot
   • Wireless Bridge
   • Wireless mesh network
   • Bluetooth

5. Wide Area Network (WAN)

   • Gateways
     • Network point that acts as an entrance to another network
   • Global System for Mobile Communications
     • EDGE
     • 3G
   • Web Protocols
     • HTTP
       • HyperText Transfer Protocol
     • HTTPS
       • Secure Socket Layer
     • FTP
       • Files
     • WebDav
   • Protocols
     • TCP/IP