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Switching in an Enterprise Network

Switching in an Enterprise Network. Introducing Routing and Switching in the Enterprise – Chapter 3. Objectives. Compare the types of switches used in an enterprise network. Explain how Spanning Tree Protocol prevents switching loops. Describe and configure VLANs on a Cisco switch.

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Switching in an Enterprise Network

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  1. Switching in an Enterprise Network Introducing Routing and Switching in the Enterprise– Chapter 3

  2. Objectives • Compare the types of switches used in an enterprise network. • Explain how Spanning Tree Protocol prevents switching loops. • Describe and configure VLANs on a Cisco switch. • Describe and configure trunking and Inter-VLAN routing. • Maintain VLANs in an enterprise network.

  3. Compare the Types of Switches Used in an Enterprise Network • Switching and network segmentation • Content addressable memory (CAM) • Virtual circuits

  4. Compare the Types of Switches Used in an Enterprise Network • Hardware-based Layer 2 switching • Software-based Layer-3 (multilayer) switching

  5. Compare the Types of Switches Used in an Enterprise Network • Store and forward switching • Cut-through switching • Fast-forward • Fragment-free

  6. Compare the Types of Switches Used in an Enterprise Network • Switch physical security • Switch access security

  7. Explain How Spanning Tree Protocol Prevents Switching Loops • Redundancy in network equipment • Redundant network links • Dangers of switching loops • Broadcast storms

  8. Explain How Spanning Tree Protocol Prevents Switching Loops • Create a loop-free logical topology • Potential loop detection and port blocking • Redundancy without switching loops

  9. Explain How Spanning Tree Protocol Prevents Switching Loops • Determining a root bridge • Bridge ID (BID) • Root ports, designated ports, and blocked ports

  10. Explain How Spanning Tree Protocol Prevents Switching Loops • STP recalculations • Minimizing downtime • PortFast • UplinkFast • BackboneFast

  11. Explain How Spanning Tree Protocol Prevents Switching Loops • Spanning-tree verification commands

  12. Explain How Spanning Tree Protocol Prevents Switching Loops • Rapid Spanning Tree Protocol • Discarding • Active topology

  13. Describe and Configure VLANs on a Cisco Switch • Virtual LANs • Logical networks • Broadcast control • Transparent to end-users

  14. Describe and Configure VLANs on a Cisco Switch • VLAN functions • VLAN membership • Static • Dynamic

  15. Describe and Configure VLANs on a Cisco Switch • VLAN 1: management VLAN • VLAN numbers and names • Port assignment

  16. Describe and Configure VLANs on a Cisco Switch • VLAN verification commands • Deleting a VLAN • Removing a port from a VLAN

  17. Describe and Configure VLANs on a Cisco Switch • VLAN ID • Frame tagging: IEEE 802.1Q

  18. Describe and Configure Trunking and Inter-VLAN Routing • Trunk port characteristics Point-to-point link Carry multiple-VLAN traffic over single link • Support for frame tagging • Trunk modes

  19. Describe and Configure Trunking and Inter-VLAN Routing • Extending VLANs across switches • Configuring a native VLAN

  20. Describe and Configure Trunking and Inter-VLAN Routing • Connectivity between different VLANs • Subinterfaces • Router-on-a-stick

  21. Maintain VLAN Structure on an Enterprise Network • VLAN Trunking Protocol (VTP) purpose and goals • Management domain • VTP modes: server, client, transparent • VLAN database • Configuration revision number

  22. Maintain VLAN Structure on an Enterprise Network • VTP messages • Summary advertisements • Subset advertisements • Advertisement requests

  23. Maintain VLAN Structure on an Enterprise Network • Configuring VTP • Verifying VTP configuration

  24. Maintain VLAN Structure on an Enterprise Network • VLANs and IP phones • VLANs and wireless security

  25. Maintain VLAN Structure on an Enterprise Network • VLAN best practices • VLAN security

  26. Summary • Switches forward traffic using store and forward or cut-through techniques • Basic security features should be applied to switches • A VLAN is a way to group hosts on the same logical network even though they may be physically separated • Frame tagging allows a switch to identify the source VLAN of an Ethernet frame. • A Layer 3 device is needed to move traffic between different VLANs. • Subinterfaces allow router interfaces to support multiple VLANs. • VLAN Trunking Protocol provides centralized control, distribution and maintenance of VLANs.

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