3.3 Fundamental routing concepts

  • 3.3.a Implement and troubleshoot static routing
  • 3.3.b Implement and troubleshoot default routing

sam, you made the pants too long…

i’ve worked with people in the past who refer to themselves as network engineers because they’ve been supporting networks for a long time… often, of course, they have no certification whatsoever… yet they are network engineers because, well, because they say so, that’s why… you know who you are… my feeling is the term network engineer has been so watered down by this practice of declaring oneself as such as to be completely meaningless…  fundamental concepts like the difference between a static route and a default route can distinguish the sheep from the shepherds…

hit it sam:

• Static routing refers to routes to destinations being listed manually, or statically, as the
   name implies, in the router. Network reachability in this case is not dependent on the
  existence and state of the network itself. Whether a destination is active or not, the
 static routes remain in the routing table, and traffic is still sent toward the specified
• Default routing refers to a “last resort” outlet. Traffic to destinations that is unknown
         to the router is sent to that default outlet. Default routing is the easiest form of routing  for a domain connected to a single exit point.
• Dynamic routing refers to routes being learned via an interior or exterior routing
   protocol. Network reachability is dependent on the existence and state of the network.
  If a destination is down, the route disappears from the routing table, and traffic is not
   sent toward that destination.