Communication Paths

These nodes need to communicate with one another as well. This shown using communication paths. We will use two main types of communication paths:

• Normal communication. This is normal two-way communication, between servers, servers and clients, and clients. Shown using a solid line, along with the type of communication (TCP/IP, UDP, etc.).

• Application. You can also specify the application level protocol that will be used for the communication, e.g. HTTP, etc.

Let’s put it all together:

You can see that some webserver (which we, at this stage, don’t care about the origin) is running subsystem1. The Administrator has a device (some device, we don’t care) that is running a web browser that communicated with the web server (using HTTPS over TCP/IP) and has loaded this subsystem1.

Actually pretty simple, don’t you think?