Recognizing Symptoms

       The first step to resolving any problem is to identify and interpret the symptoms."Recognizing Symptoms" The first step to resolving any problem is to identify and interpret the symptoms. You may discover network problems in several ways. Users may complain that the network seems slow or that they cannot connect to a server. You may pass your network management station and notice that a node icon is red. Your beeper may go off and display the message:WAN connection down.

User Comments
       Although you can often solve networking problems before users notice a change in their environment, you invariably get feedback from your users about how the network is running, such as:

• They cannot print.
• They cannot access the application server.
• It takes them much longer to copy files across the network than it usually does.
• They cannot log on to a remote server.
• When they send e-mail to another site, they get a routing error message.
• Their system freezes whenever they try to Telnet.

Network Management Software Alerts
      Network management software, as described in"Your Network Troubleshooting Toolbox", can alert you to areas of your network that need attention. For example:

• The application displays red (Warning) icons.
• Your weekly Top-N utilization report (which indicates the 10 ports with the highest utilization rates) shows that one port is experiencing much higher utilization levels than normal.
• You receive an e-mail message from your network management station that the threshold for broadcast and multicast packets has been exceeded.

       These signs usually provide additional information about the problem, allowing you to focus on the right area.

Analyzing Symptoms

      When a symptom occurs, ask yourself these types of questions to narrow the location of the problem and to get more data for analysis:

• To what degree is the network not acting normally (for example, does it now take one minute to perform a task that normally takes five seconds)?
• On what subnetwork is the user located?
• Is the user trying to reach a server, end station, or printer on the same subnetwork or on a different subnetwork?
• Are many users complaining that the network is operating slowly or that a specific network application is operating slowly?
• Are many users reporting network logon failures?
• Are the problems intermittent? For example, some files may print with no problems, while other printing attempts generate error messages, make users lose their connections, and cause systems to freeze. " You may discover network problems in several ways. Users may complain that the network seems slow or that they cannot connect to a server. You may pass your network management station and notice that a node icon is red. Your beeper may go off and display the message:WAN connection down.