Professor Messer, Author at Professor Messer IT Certification Training Courses

Hacking Nmap: Using Nmap to Calculate Network Response Time

Nmap / September 23, 2007 December 3, 2020

“The network is slow!” Almost everyone in Information Technology has heard the cries of the end user community when their important application begins crawling. Because of the complexities associated with modern application infrastructures, technology professionals are often challenged to determine the source of the slowdown. Is the application sluggishness related to the network, security configuration, the end-user workstations, the server, or the application?

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How to Supercharge Your Nmap Scans

Nmap / September 17, 2007 May 23, 2009

For many security professionals, running Nmap scans against critical systems is an everyday occurrence. Unfortunately, waiting for these scans to finally complete is also part of normal life.

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Gonna scan your network, like it’s my birthday

Nmap / September 1, 2007 May 16, 2009

Can you believe that Nmap is ten years old? If it’s the 1st of September, you can celebrate by running Nmap with at least one level of verbosity (-v).

The Details in an Nmap Protocol Decode

Nmap / June 25, 2007 May 23, 2009

In the last mini-training course lesson, we learned about the different methods of gathering the network traffic created during our Nmap scans. In this lesson, we’ll go through our trace file and see exactly what happens when Nmap hits the network.

How to Trace an Nmap Scan

Nmap / June 25, 2007 May 23, 2009

Have you ever wondered what really happens across the network during an Nmap scan? In this tutorial, we’ll find out how to take a closer look into the thousands of packets that traverse the network during a default Nmap scan.

Using Nmap to Find Rogue Devices

Nmap / May 24, 2007 June 29, 2019

Nmap is one of the best port scanners in the world, but did you know that Nmap can tell you the exact application name and version number hiding behind each port? More importantly, Nmap can tell you about the applications that you DON’T want to see!

Optimizing Your Nmap Scan: Other Nmap Options

Nmap / May 16, 2007 June 29, 2019

A primary goal of network security professionals is to protect the network while maintaining maximum availability and performance of the network applications. These Nmap options will provide additional opportunities to optimize your security scans while keeping the network at peak efficiency.

Optimizing Your Nmap Scan: Nmap Scanning Methods

Nmap / April 30, 2007 June 29, 2019

Although running Nmap with the default settings is very easy, it leaves an amazing amount of Nmap functionality unused. Nmap includes FIFTEEN different Nmap scan methods, and most people only use the default! There’s a lot of power just waiting to be tapped.

Optimizing your Nmap Scan: The Nmap Ping Process

Nmap / April 30, 2007 June 29, 2019

If you’ve ever run Nmap alone on the command line with simply a target IP address, then you’re probably using an inefficient method of performing your Nmap scans. Nmap includes many different command line options so you can tailor each scan to the results that you need.

Deciphering Nmap’s Port Descriptions

Nmap / April 28, 2007 June 29, 2019

Nmap is an incredibly useful tool, but it’s even more useful if you understand the results of an Nmap scan. After a scan is complete, Nmap will categorize each scanned port into one of six states; open, closed, filtered, open|filtered, closed|filtered, and unfiltered.