1. 240:237 - Coordinating Technology in an Educational Setting April 8, 2010

2. WirelessCopper-BasedFiber StandardIEEE 802.11IEEE 802.3 Typesa, b, g, nEthernetSingle vs. Multi TransmissionUp to 54 MbpsUp to 100 MbpsUp to 40 Gbps SignalRadio WavesElectricityLight CostInexpensive Expensive Distance100 meters Up to 40 miles

3. LAN (Local Area Network) WAN (Wide Area Network)

4. HubsSwitches  Clean up electrical signals  Multiple ports  Extends network size  Increases the size of the collision domain  Forwards all traffic to everyone  Unmanaged  Clean up electrical signals  Multiple ports  Extends network size  Reduces the size of the collision domain  Filters traffic based upon MAC addresses MAC addresses  Unmanaged and managed

6.  Determines best path for data delivery  Use IP addresses to determine network location  Configuration ◦ Command Line Interface - CLI ◦ Graphical User Interface – GUI

8. MAC Addresses IPv4 vs IPv6 Classes Private Addressing

9.  Media Access Control Address  Burned in address (BIA) on network interface cards (NIC)  48-bit address or 12 hexadecimal digits  Example 12-34-56-78-9A-BC ◦ First 6 digits identify manufacturer ◦ Last 6 digits identify device  Switches use to filter data  Other Names ◦ Adapter Address ◦ Physical Address ◦ Hardware Address

10.  Every device has one assigned  IPv4 ◦ 32-bit dotted decimal notation ◦ Example – 192.250.23.6  IPv6 ◦ 128-bit address ◦ Example – fe80::c0ae:e644:7ea4:a3e5  Divided into Network & Host portion ◦ Network = street ◦ Host = house  Hierarchical  INAN – Internet Numbers Assigned Authority INAN

11.  Class A ◦ Large, global networks ◦ First octet ranges from1-127  Class B ◦ Medium-sized networks ◦ First octet ranges 128-191  Class C ◦ Small networks ◦ First octet ranges 192-223  Class D –Multicast purposes  Class E - Experimental purposes

12.  Shortage of Public IP addresses  Reserved for private use by anyone  Not routable across Internet  These addresses will be translated to a public IP address before forwarding.  Class A ◦ 10.0.0.0 - 10.255.255.255  Class B ◦ 172.16.0.0 - 172.31.255.255  Class C ◦ 192.168.0.0 - 192.168.255.255

13. Access Point Router Switch

14. ABGN Data RatesUp to 54Mbps Up to 11Mbps Up to 54Mbps Frequency5 GHz band2.4GHz band 2.4GHz & 5GHz band SecurityWEP & WPA

15.  Open ◦ Everyone has access  PSK (Pre-shared keys) ◦ One-way authentication which aligns host to the Access Point (AP)  EAP ( extensible authentication protocol) ◦ Two-way authentication

16.  WEP (Wired Equivalency Protocol) ◦ Pre-configured keys ◦ 64 bits or 128 bits long ◦ Passphrase option – static key ◦ Change key frequently  WPA (Wi-Fi Protected Access) ◦ New, dynamic keys ◦ 64 bits to 256 bits ◦ More secure – harder to break