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Table Of Contents  CertiGuide to Network+
 9  Chapter 0101:  TCP/IP
      9  XI  TCP/IP Network Diagnostic Utilities

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NETSTAT

NETSTAT reveals the status of all active TCP and UTP port activity for either workstations or servers. Preventing this type of information being revealed can be accomplished by blocking UTP ports 137, and 138 along with TCP port 139 at the routers that serve connections.

To use the NETSTAT command, type NETSTAT with the appropriate switches at the Command Prompt. As with the other command-line utilities, you can use the "/?" Switch to obtain the list of valid switches and an explanation of what they do.

Figure 45: NETSTAT /?

 


 

Port Number

A packet of data determines what machine to go to, by its destination IP address. It determines what service to invoke on that machine by its port number.

If you are looking at a network analyzer log, you can decipher a packet’s source address, destination address and port number, to find out more about what that conversation is trying to accomplish.



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