Network
IP
Network
IP
Phys 1
Link 1
Link 1
Phys 1
Phys 2
Link 2
IP:
the “Thin Waist” of the Earth’s Internet
Internet: a Network of Connected Sub-Networks
Phys 2
Link 2
Phys 3
Link 3
App
App
App
App
App
App
Network
IP
Transport
TCP
Network
IP
Transport
TCP
Phys 3
Link 3