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CNT 4104 Florida Gulf Coast University Instructor Zalewski , Janusz October 24 th , 2008

CNT 4104 Florida Gulf Coast University Instructor Zalewski , Janusz October 24 th , 2008. VLAN Functionality Understanding and Using Virtual Local Area Network Technology Author: Josh Gallegos. Introduction – Why VLAN?. Can segment the “broadcast domain” No cross traffic between VLANs

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CNT 4104 Florida Gulf Coast University Instructor Zalewski , Janusz October 24 th , 2008

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  1. CNT 4104 Florida Gulf Coast University Instructor Zalewski , Janusz October 24th, 2008 VLAN FunctionalityUnderstanding and Using Virtual Local Area Network TechnologyAuthor: Josh Gallegos

  2. Introduction – Why VLAN? • Can segment the “broadcast domain” • No cross traffic between VLANs • Reduces congestion/collisions • Increased security • VLANs independent of physical location • Allows networking across different places, for better or worse…

  3. How does it work? • Port routed • Packets received pushed out to same port • Configured on an Ethernet switch • Embedded tags • Done via IEEE 802.1Q protocol • VLAN identifier (1-4096) • Priority (1-7) • Allows forwarding based on packet header • Logical entity: Software controlled

  4. Security Aspect • Segments cannot cross packets • Permits sectioning purely for wireless access • 802.1Q protocol allows segregation of switches, routers and firewalls

  5. Example of a VLAN setup 1 2 3 4 5 6 7 Low priority 4 6 1 4 3 7 High priority How should we assign priority??

  6. Programming Example • Not yet complete

  7. References • Fat man. Digital image. Chiefhomeofficer.com. 23 Oct. 2008 <http://www.chiefhomeofficer.com/wp- content/uploads/2008/04/cartoon-in-shorts-at-pc1.jpg>. • Phifer, Lisa. “Using VLANs to compartmentalize WLAN traffic” SearchNetworking.com 23 Oct. 2008 <http://searchnetworking.techtarget.com/generic/0,295 582,sid7_gci1168965,00.html>. • “Virtual LAN” Wikipedia, The Free Encyclopedia. 23 Oct. 2008 < http://en.wikipedia.org/wiki/Virtual_LAN >. • “What is a VLAN?” TechFAQ.com 23 Oct. 2008 <http://www.tech-faq.com/vlan.shtml>.

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