Using Network Scanners and Vulnerability Assessment Tools

How to Use Network Scanners and Vulnerability Assessment Tools Effectively

Using network scanners and vulnerability assessment tools is a key skill for any cyber security analyst. These tools help you find devices on a network, locate security weaknesses, and protect systems from cyber attacks.

Network scanners work by discovering all the devices connected to a network. They identify computers, servers, printers, and other devices by checking their IP addresses and open ports. This gives a clear map of what equipment is active, making it easier to monitor and control access.

Vulnerability assessment tools dig deeper. They check systems for security holes like outdated software, weak passwords, or misconfigured settings. Once these weaknesses are found, you can fix them before hackers exploit them.

Here are the practical steps for using these tools:

1. Choose the right tool: Popular network scanners include Nmap and Angry IP Scanner. For vulnerability assessment, tools like Nessus, OpenVAS, or Qualys are common.
2. Scan the network: Start with a network scan to list all connected devices. This helps build a baseline of what should be on the network.
3. Run vulnerability scans: Target critical systems or the entire network. The tool will check for known issues and produce a report.
4. Review the results: Look carefully at the report to identify serious risks like missing patches or unsecured services.
5. Apply fixes: Patch software, change weak passwords, close unnecessary ports, and update configurations as needed.
6. Rescan after fixes: Make sure vulnerabilities have been removed and nothing new has appeared.

It is important to run scans regularly, not just once. Networks change often, and new vulnerabilities appear daily. Scheduled assessments help catch problems early and improve security over time.

Remember to always get permission before scanning any network or system. Unauthorized scanning can disrupt services and may be illegal.

In South Africa, many organisations use these tools as part of their cyber security strategy. Learning to use them effectively prepares you for real-world jobs where protecting information systems is critical.