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Virtual LAN (VLAN)

Virtual LAN (VLAN). Christopher Lee Leo Putra Mardjuki. Table of Contents. Introduction Two approaches to designing VLAN: Single-Switch VLAN The four layers of VLANs Multi-Switch VLAN Operating Characteristics Advantages Disadvantages Conclusion References Questions time.

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Virtual LAN (VLAN)

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  1. Virtual LAN (VLAN) Christopher Lee Leo Putra Mardjuki

  2. Table of Contents • Introduction • Two approaches to designing VLAN: • Single-Switch VLAN • The four layers of VLANs • Multi-Switch VLAN • Operating Characteristics • Advantages • Disadvantages • Conclusion • References • Questions time

  3. Introduction • VLAN stands for Virtual Local Area Network. • viewed as a group of devices on different physical LAN • can communicate with each other as if they were all on the same physical LAN • Configured through software rather than hardware • extremely flexible.

  4. Single-Switch VLAN • VLAN operates only inside one switch • There are different types of Single-Switch VLAN: • Layer 1 • Layer 2 • Layer 3 • Layer 4

  5. Layer-1 VLANs • Port-based VLANs • Uses the physical layer port number on the front of the VLAN switch to assign computers to VLAN segments • Network manager must know which computer is connected to which port • Advantage • Configuration is fairly straightforward

  6. Layer-2 VLANs • MAC-based VLANs • Uses the data link layer address to form the VLANs • Advantage: • Simpler to manage when computers are moved • NO configuration is needed

  7. Layer-3 VLANs • IP-based VLANs • Uses the network layer address to form the VLANs • Compared to Layer-2: • Reduce the time spent reconfiguring the network • A bit slower at processing each message • Advantage: • Can manually input/change IP addresses • NO configuration is needed

  8. Layer-4 VLANs • Application-based VLANs • Uses the type of application indicated by port number in the TCP packet in combination with the network layer addresses to form the VLAN groups • Very complex process • Network manager must decide on variety of different factors in forming the VLANs • Advantage: • Very precise allocation of network capacity

  9. Multi-Switch VLAN

  10. Multi-Switch VLAN cont. • Works the same way as a Single-Switch VLAN, except: • Several switches are used • Switches must be able to send packets among themselves in a way that identifies the VLAN to which the packet belongs.

  11. Advantages • Increased performance • Improved manageability • Physical independence • Increased Security Option

  12. Disadvantages • Costly • Software based • Human labor to program • Depending on variety switches • Management complexity

  13. Conclusion • Reduce the cost of dealing with moves and changes • For organizations, • seen as an added benefit

  14. References • "VLAN Information." UCDavis Network 21. 06 Mar. 2006 <http://net21.ucdavis.edu/newvlan.htm>. • "VLAN." 06 Mar. 2006 <http://www.webopedia.com/TERM/V/VLAN.html>. • "Answers.com." Virtual LAN. 06 Mar. 2006 <http://www.answers.com/topic/virtual-lan?method=6>. • "Network World Research Center." VLAN (Virtual LAN). 06 Mar. 2006 <http://www.networkworld.com/details/471.html>. • "The Virtual LAN Technology Report." 1996. decisys. 06 Mar. 2006 <http://www.3com.com/other/pdfs/solutions/en_US/20037401.pdf>. • "Virtual LAN." Wikipedia The Free Online Encyclopedia. 02 Mar. 2006. 06 Mar. 2006 <http://en.wikipedia.org/wiki/VLAN>.

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