Basic HTML version of Foils prepared Dec. 6 98

Foil 25 Routing Basics (1)

From Introduction to Network Security Lectures at Xi'an Jaotong University -- Sept 1998. by Roman Markowski
1 Routing - act of moving information across a network from source to destination; routing occurs at Layer 3 of OSI RM; routing became popular in mid-1980s
2 Routing components
  • Path determination (very complex)
  • Packet transportation (referred to as switching)
3 Path determination
  • routers maintain routing tables
  • routing algorithms fill routing tables (metric: cost, load, bandwidth, reliability, path length , hop count)
  • routing update messages
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