Tools Overview
Your first lines of defense in network troubleshooting are common applications, the Mac operating system, and bundled utilities. Applications are the easiest methods of testing a connection, while using the utilities/diagnostics are more important in advanced troubleshooting of unresolved issues. Remember, one of the first things you must determine is whether your issue involves a single computer, multiple computers on your local network (your LAN), your ISP's equipment (WAN), or the Internet site you are trying to access. Since the Internet as a whole does not fail entirely, even large Internet-related problems are usually isolated to a single ISP, a small part of the overall Internet, or just a single website or server.
Applications ...
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