I am reading a document and cannot fully comprehend
what it means. can someone explain, atleast
briefly....

it basically talks about network design...

"the traffic that comes off the router (towards
internal network) is split into following depending
upon the upper layer protocol.
it may go to a firewall for stateful inspection,
it may go to a SSL/gateway doing transport layer/SSL
encryption and proxying,
or it may go to an IPSEC gateway"

after the traffic emerges from the router interface,
who gets to decide, ie what device decides to send to
the appropriate device (firewall, IPSEC g/w, SSL /g/w)

as i see the flow, there are 3 paths available to the
traffic after it comes off the router interface. right
? 

what is the upper layer protocol here ? does it refer
to TCP ? 



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