Ethernet·§½×
Cable ³Ì¤jªø«×­­¨î
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CSMA/CD Access Method
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OSI Model
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LAN Switches
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Switch forwarding §Þ³N
Switch ³N»y
¦b switch Àô¹Ò¤¤¦s¦b¨º¨Ç°ÝÃD?


LAN Switches

Shared LAN Media

¶Ç¿é¶q(throughput) ©M ¸I¼²°ÝÃD

Bandwidth Hogs

  • ¬Y¤@¾÷¥x´X¥G¦û¥Îºô¸ô¤¤©Ò¦³¦³®ÄBANDWIDTH
  • Servers ¸g±`¤j¶q®ø¯Óºô¸ô¤¤BANDWITCH

Âǥѳгy¦h­«¸ô®|¨Ó¼W¥[¥æ´«¾¹ÀW¼e

What is a Switch?

  • Is it a Repeater?
  • Is it a Bridge?
  • Is it a Router?

Switch forwarding §Þ³N

  • Store and Forward
  • Makes the forwarding decision after receiving the entire frame
  • Cut Through
  • Makes the forwarding decision after receiving the destination MAC address
  • Fragment Free (Modified Cut Through)
  • Makes the forwarding decision after receiving 64 bytes of the frame

Switch Technologies

Switch ³N»y

  • Latency ¶Ç°e©µ¿ð
  • Single MAC or Multi-MAC
  • Spanning Tree Implementation
  • Management
  • Full Duplex Ports
  • Virtual LAN’s

The Real World

¦b switch Àô¹Ò¤¤¦s¦b¨º¨Ç°ÝÃD?

  • µLªk¬Ý switch ¤º³¡±¡ªp
  • ¨º¤@ port ¥Ø«e¨Ï¥Î¶q³Ì¤j?
  • ¿ù»~¨Ó·½¦p¦ó°lÂÜ?
  • ¼s¼½­·¼É
  • ºô¥dÂà´« tables ¯}Ãa
  • Switch ¨C¤@ port ³s±µ ¨º ´X¥x?

¤­­Ó¨BÆJ°µºô¸ô¬G»Ù°£¿ù

  1. ¦¬¶°¸ê®Æ¨Ã¤ÀªR¬G»Ù¼x¥ü
  2. §â°ÝÃDÁY¤p½d³ò¤ñ¦p:°Ï¬q©Î HUB ©Î User
  3. §P§O°ÝÃD¬O H/W or S/w
  4. ¸Ñ¨M°ÝÃD
  5. ½T©w°ÝÃD¯u¥¿¸Ñ¨M

Case Study 1
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