F09_class_20_ChExt10

F09_class_20_ChExt10 - How the Internet Works Chapter...

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How the Internet Works Chapter Extension 10 MIS 301 Introduction to IT Management
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Class Business Grading MSGP3 to return on Wed, 10/14 Reminder – Friday, 10/16, MSGP team work day; please meet with your team before or on Friday How does the Internet work? Today in class: Why do we need both IP addresses and domain names? How does a firewall work? How do wired and wireless networks connect? Why do we need modems? What does all this have to do with my small office/home office (SOHO)? Why do we need encryption? What is a Virtual Private Network (VPN) and why does Dee need one?
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Some Important Acronyms DNS – Domain Name System IP – Internet Protocol TLD – top level domain URL – uniform resource locator ICANN – Internet Corporation for Assigned Names and Numbers DHCP – Dynamic Host Configuration Protocol SOHO – small office/home office Ethernet Protocol (runs) in LANS Wired 802.3 Wireless 802.11
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DNS Converts IP Addresses Computers read IP addresses People read domain names, which is why we have Uniform Resource Locators (URLs) such as www.mccombs.utexas.edu Domain Name System (DNS) resolves domain names – converts domain names to IP addresses Domain name server accepts requests from programs to convert domain names into IP addresses Accept requests from other domain name servers to convert domain names into IP addresses (e.g., cnn.com: 157.166.226.26)
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Tracking Connections Track IP addresses from CMD line Start – Run – cmd (go to Command line) ipconfig – find your P address ping – connect to another IP address tracert – trace the route on your ping Trace route visually http://www.yougetsignal.com/tools/visual-tracert /
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What Does a Firewall Do? Computer device that prevents unauthorized network access May be special-purpose computer or program
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Firewall Organizations may have multiple firewalls Perimeter firewalls outside organizational network Internal firewalls inside network Packet-filtering firewalls examine source address, destination address, etc before letting message pass May filter both incoming and outgoing messages Access control list (ACL) encodes rules stating what packets are allowed or prohibited http://www.warriorsofthe.net/
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Local Area Network (LAN) IEEE 802.3 protocol
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IEEE 802.3 Protocol on LAN Protocol – a rule which guides how an activity should be performed Ethernet protocol standard IEEE 802.3 Specifies hardware characteristics
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This note was uploaded on 12/17/2010 for the course MIS 301 taught by Professor Mccleod during the Spring '08 term at University of Texas.

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F09_class_20_ChExt10 - How the Internet Works Chapter...

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