" diffrence btw session and nonsession based transport"

hello friends
what is the difference between non session based transports eg. UDP,ICMP and session based transpots?

any help is welcomed
hackmania

non-session ie UDP = information is sent in one direction
.......no error checking
.......quick and dirty
session bassed ie TCP = information is sent in both directions.
.......check for errors
.......slow and reliable

Thats VERY basic, but it gives you an idea....