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NetworkingInstalling, Securing, &
Administering240:237 - Coordinating Technology
in an Educational SettingApril 8, 2010
Networking MediaWireless Copper-Based Fiber
Standard IEEE 802.11 IEEE 802.3 IEEE 802.3
Types a, b, g, n Ethernet Single vs. Multi
Transmission Up to 54 Mbps Up to 100 Mbps Up to 40 Gbps
Signal Radio Waves Electricity Light
Cost Inexpensive Inexpensive Expensive
Distance 100 meters 100 meters Up to 40 miles
LAN Devices
Hubs Switches
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 Unmanaged and
managed
Determines best path for data delivery Use IP addresses to determine network
location Configuration
◦ Command Line Interface - CLI◦ Graphical User Interface – GUI
WAN Devices - Routers
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
MAC Addresses
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
IP Addresses
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
IP Address Classes
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
Private IP Addresses
Wireless StandardsA B G N
Data Rates Up to 54Mbps
Up to 11Mbps
Up to 54Mbps
Up to 54Mbps
Frequency 5 GHz band 2.4GHz band
2.4GHz band
2.4GHz & 5GHz band
Security WEP & WPA WEP & WPA WEP & WPA WEP & WPA
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
Wireless Authentication
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