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Network Port Scanning

Port Scanners are used to increase the security of the network. Port scanning can be done inside your network to test various servers and workstation or it can be done from outside your network to determine what services can be accessed from the internet through your firewall. It is used to determine services that a computer is running and shut down services not being used to increase the security of the computer being scanned and determine the vulnerabilities of the services that are being run in the computer being scanned

Internal and External Port Scanning

There are some security service providers that will scan your network from the internet to test for open ports and vulnerabilities on your servers. They may provide a printed or electronic report on the results outlining your vulnerabilities and giving recommendations about how to fix them. Many of these services are very useful especially since they stay current with current vulnerability information and update their software regularly to test for new vulnerabilities.

Even if you hire someone to scan your network from the outside, you should still scan your network with your own scanning tools from the inside. Please note that before scanning or sniffing your network, even as a network administrator, you should always get written permission from your management first up to the level of your CIO. This to avoid prosecution should someone decide they do not like information being scanned. Also be sure you do not scan when system crashes due to scans could cause loss of data or interfere with work.

If you scan your network, you should scan specific parts of your network rather than the whole network at one time. I would recommend that you scan and secure your servers first, but do not do this during normal business hours when your server usage is at a peak. Also you may want to warn your users before a scan is done that some service interruption may occur due to system preventative maintenance.

Port Scanners

There are many port scanner types some of which may identify vulnerabilities along with ports that are being serviced. Links to port scanners can be found at

Related Topics on Computer and Information security

  1. Software Vulnerability Control
  2. Firewall Protection
  3. Network Intrusion Detection
  4. Network Port Scanning
  5. Network Tools passwords
  6. Types of attacks
  7. Application Level Protection
  8. Systems Protection
  9. Mail and Security
  10. Hostile Software


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