cisco ccna module 8
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1© 2004, Cisco Systems, Inc. All rights reserved.
Module 8 Ethernet Switching
222© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idObjectives
333© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idThings to consider…
• Shared Ethernet works very well – within limits
• What things cause problems that reduce bandwidth in a shared environment?
444© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idLayer 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
555© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idBridges
666© 2004, Cisco Systems, Inc. All rights reserved.
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Switch Operation
• Switch – a multiport Bridge
• Divides collision domain into many smaller collision domains
• Full-Duplex technology
777© 2004, Cisco Systems, Inc. All rights reserved.
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Full Duplex
888© 2004, Cisco Systems, Inc. All rights reserved.
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Network Latency
999© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idSpanning-Tree Operation
Multiple paths means that frames can loop
101010© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idSwitch 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
111111© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idSTP States
Spanning Tree Protocol moves from blocking to listening to learning and then to forwarding or disabled.
121212© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idTypes of Networks
131313© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idCollisions in Collision Domain
141414© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idCollision Domain Segmentation
151515© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idIncreasing a Collision Domain
161616© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idLayer 1 Devices Extend Collision Domains
171717© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idLimiting the Collision Domains
181818© 2004, Cisco Systems, Inc. All rights reserved.
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Segmenting a Collision Domain with a Bridge
191919© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idBroadcasts in a Bridged Environment
202020© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idEffects of Broadcasts in a IP Network
212121© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idBroadcast Domain Segmentation
222222© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idData Flow Through a Network with a Router
232323© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idSegments
242424© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idWhat 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.
252525© 2004, Cisco Systems, Inc. All rights reserved.
www.pnj.ac.idSummary
For more info on switches check out
http://www.bellevuelinux.org/network_switch.html
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