Videos: Networking

Networking protocols all processes running on different machines to communicate. We will look at two of the most widely used protocols, UDP and TCP, which both build on the IP naming and packet protocol. In this first set of videos, we work through details up to the UDP layer, leaving TCP details for next time.

The example implementations described in these videos are available as udp+tcp.zip.

• Network 1: Overview of TCP & UDP   4:36
  A high-level overview of TCP and UDP from a process’s perspective.

• Network 2: IP   3:35
  How IP enables processes to find each other and send packets of data.

• Network 3: Protocol layers   4:32
  A closer look at packet delivery and how routers get to make decisions and adjust packets.

• Network 4: Naming and DNS   2:52
  Hostnames are mapped to numerical IP addresses via DNS.

• Network 5: More naming issues   2:10
  Name resolution generalizes to solves additional problems (besides finding remote hosts) toward using the system’s networking APIs.

• Network 6: getaddrinfo   2:35
  The C library’s getaddrinfo function provides a general name-resolution facility.

• Network 7: Implementing hostinfo   2:13
  Example of using getaddrinfo and getnameinfo to look up names.

• Network 8: UDP & TCP as layers over IP   1:59
  UDP and TCP in the context of the naming and packet facilities defined by IP.

• Network 9: Sockets   3:08
  The Unix API for networking is based on the socket datatype.

• Network 10: UDP lifecycle   1:52
  Overview of how system calls are assembled for communication over UDP.

• Network 11: UDP example   3:11
  Example client and server programs that use UDP.

• Network 12: Choosing a server network interface   1:42
  Example of serving from a specific network interface, so that connections are allowed only from the local machine.

• Network 13: More UDP   3:29
  Other elements of the Unix API for UDP, including reporting the sender of a message - and investigating the limitations of UDP communication.