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Understanding VLANs: Enhancing Network Security and Flexibility

This article explores Virtual Local Area Networks (VLANs), which are crucial in modern networking. VLANs create logical groups of users associated with specific switch ports, improving network efficiency. We discuss how VLANs address problems with flat networks, such as large broadcast domains and lack of security controls. By segmenting networks based on location or department, VLANs enhance security by preventing unauthorized monitoring of traffic. The article also highlights the need for routers to enable communication between VLANs, maintaining flexibility and scalability in network design.

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Understanding VLANs: Enhancing Network Security and Flexibility

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  1. VLANCisco (Router/Switch) Dr. Young Cal Poly Pomona

  2. Definition • Virtual Local Area Network • Logical group of network users • Associate with ports on a switch • Unique ID and NAME • VLANs could span multiple switches

  3. Problems with flat network • Broadcast domain become too large • No security control for individual switch ports • Inflexible because subnets are created only with addition of routers Net B Net C Net A Router A flat network Net D

  4. What does VLAN do? • Create smaller broadcast domains by grouping users according to • Location • Department • etc • Improve security by preventing anyone in the same LAN from monitoring the network traffic (eavesdropping)

  5. What does VLAN do? • Increase flexibility and scalability by letting system administrators to create virtual subnets without adding routers

  6. Receive Receive Receive Receive Receive Receive Receive Receive Broadcast in flat network Switch Router Switch BROADCAST Switch

  7. RECEIVE RECEIVE Broadcast in VLAN VLAN A VLAN B VLAN C Switch Router Switch BROADCAST Switch

  8. Routing between VLAN • Switches do not route data between VLANs • Routing has to be done in routers, the same way as with ordinary subnets

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