Cisco CCNA module 8

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Cisco CCNA module 8

  1. 1. 1© 2004, Cisco Systems, Inc. All rights reserved. Module 8 Ethernet Switching
  2. 2. 222© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Objectives
  3. 3. 333© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Things to consider… • Shared Ethernet works very well – within limits • What things cause problems that reduce bandwidth in a shared environment?
  4. 4. 444© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Layer 2 Bridging • A bridge can be used to create two collision domains • Source MAC address of a frame and the associated incoming switch port are added to the address table
  5. 5. 555© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Bridges
  6. 6. 666© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Switch Operation • Switch – a multiport Bridge • Divides collision domain into many smaller collision domains • Full-Duplex technology
  7. 7. 777© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Full Duplex
  8. 8. 888© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Network Latency
  9. 9. 999© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Spanning-Tree Operation Multiple paths means that frames can loop
  10. 10. 101010© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Switch Modes • Store and Forward - A switch receives the entire frame before sending it out the destination port. • Cut-Through - A switch starts to transfer the frame as soon as the destination MAC address is received. • Fragment-Free - Read the first 64 octets only to obtain the header information –Therefore misses the CRC for checking
  11. 11. 111111© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id STP States Spanning Tree Protocol moves from blocking to listening to learning and then to forwarding or disabled.
  12. 12. 121212© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Types of Networks
  13. 13. 131313© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Collisions in Collision Domain
  14. 14. 141414© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Collision Domain Segmentation
  15. 15. 151515© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Increasing a Collision Domain
  16. 16. 161616© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Layer 1 Devices Extend Collision Domains
  17. 17. 171717© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Limiting the Collision Domains
  18. 18. 181818© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Segmenting a Collision Domain with a Bridge
  19. 19. 191919© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Broadcasts in a Bridged Environment
  20. 20. 202020© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Effects of Broadcasts in a IP Network
  21. 21. 212121© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Broadcast Domain Segmentation
  22. 22. 222222© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Data Flow Through a Network with a Router
  23. 23. 232323© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Segments
  24. 24. 242424© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id What is a segment? From the previous slide the three definitions of a segment are: • Term used in the TCP specification to describe a single transport layer unit of information. • Section of a network that is bounded by bridges, routers, or switches. • In a LAN using a bus topology, a segment is a continuous electrical circuit that is often connected to other such segments with repeaters.
  25. 25. 252525© 2004, Cisco Systems, Inc. All rights reserved. www.pnj.ac.id Summary For more info on switches check out http://www.bellevuelinux.org/network_switch.html

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