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# CS101 Lecture 12 Network Basics

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### CS101 Lecture 12 Network Basics

1. 1. CS101 Lecture 12 Network Basics
2. 2. Computers love bytes and a factor of ____ <ul><li>Up to now we have been using bytes as our main unit of measurement with a factor of ____ </li></ul><ul><li>For instance storage measured in bytes </li></ul><ul><ul><li>1 bit = 0 or 1 </li></ul></ul><ul><ul><li>1 bit * 8 = 8 bits = one byte </li></ul></ul><ul><ul><li>1 byte * 1024 = 1024 bytes = 1 Kilobyte </li></ul></ul><ul><ul><li>1 byte * 1024 * 1024 = 1,048,576 bytes = 1 Megabyte </li></ul></ul><ul><ul><li>1 byte * 1024 * 1024 * 1024 = 1,073,741,824 bytes = 1 Gigabyte </li></ul></ul><ul><ul><li>1 byte * 1024 * 1024 * 1024 * 1024 = 1,099,511,627,776 bytes = 1 Terabyte </li></ul></ul>
3. 3. Networks Love Bits and a Factor of 1000 <ul><li>Movement measured in: </li></ul><ul><li>____ ___ _____ (bps) </li></ul><ul><ul><li>bps = How many bits go by a point in one second </li></ul></ul><ul><ul><li>Also called Data Transmission Rate </li></ul></ul><ul><li>1 bps = 1 ___ per second </li></ul><ul><li>1bps*1000 = 1000bps = 1 ___ bit per second = 1 kbps </li></ul><ul><li>1bps*1000*1000 = 1,000,000bps = 1 ___ bit per second = 1 Mbps </li></ul><ul><li>1bps*1000 *1000*1000 = 1,000,000,000bps = 1 ___ bit per second = 1 Gbps </li></ul><ul><li>etc </li></ul>
4. 4. Factor of ____ <ul><li>The ____________ _____ of Units (abbreviated SI from the French Le Système international d'unités) is the most commonly used for data transmission rates. </li></ul><ul><li>The SI system is denoted by the use of just one letter for the unit of measurement </li></ul><ul><ul><li>k for kilo </li></ul></ul><ul><ul><li>M for Mega </li></ul></ul><ul><ul><li>G for Giga </li></ul></ul><ul><li>The SI system uses the factor of _____ </li></ul><ul><ul><li>b = bit = 1 bit </li></ul></ul><ul><ul><li>kb = kilobit = bit*1000 = 1000 bits </li></ul></ul><ul><ul><li>Mb = Megabit = bit* 1000 * 1000 = 1,000,000 bits </li></ul></ul><ul><ul><li>Gb = Gigabit = bit*1000*1000*1000 = 1,000,000,000 bits </li></ul></ul>
5. 5. Why do data transmissions rates use ____ instead of ______? <ul><li>Officially: </li></ul><ul><ul><li>Kilo = 1000 in the metric system </li></ul></ul><ul><li>Unofficially: </li></ul><ul><ul><li>It sounds faster </li></ul></ul><ul><ul><ul><li>1,000,000,000 bps is… </li></ul></ul></ul><ul><ul><ul><li>1 Gigabit per second using a factor of 1000 </li></ul></ul></ul><ul><ul><ul><li>it would only be </li></ul></ul></ul><ul><ul><ul><li>.976 Gigabit per second using a factor of 1024? </li></ul></ul></ul>
6. 6. What is a ______? <ul><li>________ = Devices connected together so that they can exchange information </li></ul>
7. 7. A network needs 3 things <ul><li>________ ________ </li></ul><ul><ul><li>Instructions to move information between devices </li></ul></ul><ul><ul><ul><li>Standalone software or built into most operating systems </li></ul></ul></ul><ul><li>___________ </li></ul><ul><ul><li>Agree upon way to do things </li></ul></ul><ul><ul><ul><li>TCP/IP = Transmission Control Protocol/Internet Protocol </li></ul></ul></ul><ul><li>__________ </li></ul><ul><ul><li>Way to move information between devices </li></ul></ul><ul><ul><ul><li>Wired or Wireless </li></ul></ul></ul>
8. 8. _____ Networking <ul><li>Why build a ____ network? </li></ul><ul><ul><li>Hook up computers at home so that you can… </li></ul></ul><ul><ul><ul><li>Share one printer </li></ul></ul></ul><ul><ul><ul><li>Play games </li></ul></ul></ul><ul><ul><ul><li>Share music, picture, and video </li></ul></ul></ul><ul><ul><ul><li>Share one Internet connection </li></ul></ul></ul><ul><ul><ul><li>Etc </li></ul></ul></ul><ul><li>_____ network needs same 3 things as any network </li></ul>
9. 9. Home Network Software <ul><li>Built into the operating system since everyone wants to network related things with their computer </li></ul><ul><ul><li>Windows = Control Panels > Network and Internet Connections </li></ul></ul><ul><ul><li>Macintosh = Apple menu > Location > Network Preferences </li></ul></ul>
10. 10. Home Network Protocols <ul><li>Handled by the networking software </li></ul><ul><li>Since everyone wants their computer to be able to communicate with everyone else's computer we all want to use the same protocols </li></ul><ul><li>___/__ = ________ _______ ________/ ________ _______ </li></ul><ul><ul><li>About 100 protocols </li></ul></ul><ul><ul><ul><li>Example = http = Hyper Text Transfer Protocol to move web pages around in an agreed upon way </li></ul></ul></ul>
11. 11. To have a connection you need a NIC <ul><li>NIC = ________ _________ _____ </li></ul><ul><li>A ___ allows a device like a computer, printer, scanner, etc, to connect to a network </li></ul><ul><li>A ____ has a ___ address </li></ul><ul><ul><li>Media Access Control address </li></ul></ul><ul><ul><li>Unique address for each item on a network </li></ul></ul><ul><ul><ul><li>Can be found in System Information under Network Adapter </li></ul></ul></ul>
12. 12. Home network connection options <ul><li>Wired </li></ul><ul><ul><li>________ cables </li></ul></ul><ul><ul><ul><li>Fast ______ 10Mbps/100Mbps </li></ul></ul></ul><ul><ul><ul><li>Gigabit ______ 10Mbps/100Mbps/1000Mbps </li></ul></ul></ul><ul><ul><li>_______ _____ Networking (electrical system) </li></ul></ul><ul><ul><li>______ _____ Networking (phone system) </li></ul></ul>
13. 13. Home network connection options <ul><li>Wireless </li></ul><ul><ul><li>____ . __ either _, _, _, _ </li></ul></ul><ul><li>A wireless router radios the information to devices on the network. </li></ul><ul><li>Each device on the wireless network needs a wireless NIC card to receive and send signals. </li></ul>
14. 14. If you go wireless… <ul><li>_________ usually is off by default </li></ul><ul><li>Password Protect _______ </li></ul><ul><ul><li>Change default password of router </li></ul></ul><ul><li>Turn on wireless ________ and create very long password </li></ul><ul><ul><ul><li>WEP = Not quite as bad as nothing </li></ul></ul></ul><ul><ul><ul><li>WPA = Better </li></ul></ul></ul><ul><ul><ul><li>WPA2 = Best </li></ul></ul></ul><ul><li>Think about ___ address filtering and other options. </li></ul><ul><ul><li>Ready wireless router manual </li></ul></ul>