Examples of network apps include:

• social networking
• web
• text messaging
• email
• multi-user network games
• streaming stored video (YouTube, Hulu, Netflix)
• P2P file sharing
• voice over IP (Skype)
• real-time video conferencing (Zoom)
• Internet Search
• Remote login

Creating network applications involves writing programs that run on different end systems and communicate over the network.

• e.g. web server software communicates with browser software

We don’t need to write software for network core devices (e.g. routers). Rather, we write software for edge devices.

• This allows for rapid app development - don’t need to worry about network-core devices, just worry about messages passed along

Client-Server Paradigm

• Server
  • Always on a host with a permanent IP address
  • Often in a data center for scaling purposes