14
V. Liberatore
Pervasive Computing
Layering: logical communication
application
transport
network
link
physical
application
transport
network
link
physical
application
transport
network
link
physical
application
transport
network
link
physical
network
link
physical
data
data
lE.g.: transport
*take data from app
*add addressing, reliability check info to form “datagram” *send datagram to peer *wait for peer to ack receipt
*analogy: post office
data
transport
transport
ack