Whenever your 48 is deployed in net mode in network address translation mode it acts as an OS I layer
3 router as a router it does.
Decisions decisions on where to send different packets that arrives 2 or different packets that it generates.
Note it does so using a routing table routing table is actually a series of rules.
Think of each rule as the next hope.
Now the next top doesn't have to be the final destination of the packet.
It can also be our path to another router that will run the packet forwards each routing hoping the
routing part requires our 48 to do a routing table lookup that will pass the packet along until it reaches
its destination no forty eight does two routing lookups for each session for the first packet that is
sent by the originator and for the first packet that is sent by the responder as it finishes its routing
lookups he writes the routing information in the session table and all other packets that belong to
that session will follow this path.
Now when your foot is tries to match a route to a packet destination it may find some routes to the
same destination.
Which one should he choose.
Well it depends.
It depends on the route attributes the road attributes determine the best road.
All right that's enough for now.
We will look at static crowds.
These are roads that are entered manually.
We will look at dynamic routing which is configured dynamically using dynamic protocols such as OS P.F..
We will also look at policy rounds which is following its very advanced policy routing mechanism.
We will look at the different routing attributes Internet services routing.
So let's start.