Computer Science

Computer Science

1. Networks

   • Devices on a wired network
     • Hub/Switch
   • Network Topologies
     • Star Network
       • One hub/switch in the center that connects to all devices on a network
     • Ring Network
       • A single circle of computers connected to each other in one ring
     • Mesh Network
       • Where every device is connected to every other one
     • Partial Mesh
       • Where every device is connected to at least 2 others
         • Advantages: Cheaper than a regular mesh network, All devices can have at least one redundency
   • WiFi
     • Devices
       • Router
       • Network interface card
       • Wireless access point
     • Frequencies
       • 2.4GHz
         • Advantages - Has 3 channels and is a universal frequency. Has a larger range
         • Disadvantages - Interferes with other devices (eg, ovens, bluetooth, etc)
       • 5GHz
         • Advantages - Has 24 channels and is faster at transfering data due to less interference
         • Disadvantages - Less range and cannot penetrate walls or roofs as well as 2.4GHz
   • LAN and WAN
     • LAN - A network over a small geographic area (eg: a building). Can be wired (ethernet) or wireless
     • WAN - A network over a large geographic area. Always wired (copper, coaxial, fiber optic) and run by an ISP

2. Computational logic

   • Fetch-Decode-Execute
     • 1.

3. Programing

   • Errors
     • Logic
     • Syntax
     • Run time
   • Data Types
     • Integer
     • Boolean
     • Float
     • String

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