I am alway confused when it comes about source and destination IP address for extended Control Access List.
1. ......'prevent students (on student network) and outsiders on the internet from changing student files in the Records Server(on separate network), while still allowing other departments in the enterprise access.'
2. ....'prevent users on the Research Network and general Internet surfers from accessing the Company Support server(on a separate network). However, you must allow access to all the other company users'
3......'Your goal is to prevent Telnet traffic originating from the Graphics Department(on Graphic network) to reach the Web server attached to Main department network. However, you want to allow Telnet traffic to other destinations.'
In all those above example how can I identify which computers, servers are source and which are destination.