What transport service does an app need? Data loss Bandwidth D some apps (e.g, audio )can o some apps( e.g tolerate some loss multimedia) require 口 other apps(eg,fle minimum amount of transfer, telnet require 100%reliable data bandwidth to be transfer effective Timing O other apps elastic apps )make use of O some apps(e.g. whatever bandwidth Internet telephony interactive games) they get require low delay to be effective" 2: Application Layer 102: Application Layer 10 What transport service does an app need? Data loss  some apps (e.g., audio) can tolerate some loss  other apps (e.g., file transfer, telnet) require 100% reliable data transfer Timing  some apps (e.g., Internet telephony, interactive games) require low delay to be “effective” Bandwidth  some apps (e.g., multimedia) require minimum amount of bandwidth to be “effective”  other apps (“elastic apps”) make use of whatever bandwidth they get