This course is really meant as an introductory course to CISSP. In it, you will gain about 20-30% of the knowledge you need to pass the CISSP exam. You will need to supplement this course with other training material if you plan attain the CISSP certification…
Just about 15 months ago, I paid good money for the first version of their training. This newer version, available for free at the link above, seems to be just as great in quality and super comprehensive too.
NX-OS has had the great Ethanalyzer feature since very early versions. It allows you to perform limited packet captures directly on your NX-OS based switch!
It is however a pain to use practically and has lots of limitations. One of the biggest limitations is that it can only capture traffic hitting the CPU – so you are limited to control plane and management plane traffic only. That however is key to solving many problems that are often associated with (or blamed on) the network.
Here is an example that captures, displays and filters ARP packets processed through the switch these commands are being performed on.
As you may have seen from a fewpast posts, I have been going through the process of learning network programmability and network automation. My most recent attempt at delving further into the network automation world has brought me to Ansible.
I’ve been blessed with a great career in IT. I’ve had the honor of mentoring numerous individuals with their careers in IT – and one thing that I see happening consistently is that the ones that are typically the MOST qualified are the LEAST HESITANT in asking for help. Many people whom I’ve mentored have advanced degrees and certifications – like MSc, CCIE, even Phd., and other certifications, who are far more qualified than I am – and they are the ones reaching out for guidance!
What I’ve learned from this is that those are not afraid of asking for help, and don’t let their ego or nervousness or hesitation or riskiness or whatever else may be holding them back get in the way, end up being most successful.
I recently completed the Programming for Network Engineers course from the Cisco Learning Network (CLN) and I must say I was really impressed. I’ve mentioned similar courses in the past but I was really impressed with this particular one for multiple different reasons:
After multicast has been configured on the network, one of the biggest challenges tends to involve actually testing multicast functionality in between two Windows machines (physical or VMs) connected via the network.
In the past, I’ve just used iPerf and/or multicast video streaming via VLC, which are still valid and great testing options, but, sometimes when using these tools, I’m often second guessing my self as to whether or not I am even using the tool correctly and legitimately generating the multicast stream that I intend to generate. Part of the problem is that iPerf can be complicated to use, and VLC multicast streaming can be buggy.
I would still continue to use the iPerf/jPerf and VLC multicast video streaming method, which can be a good way to test throughput, however, I’ve now come across new VERY SIMPLE tool to validate basic multicast connectivity, the Singlewire Mutlicast Testing Tool (free).
For those who’ve read previous blog posts, you can probably tell that constant learning and training is a recurring theme on my blog. I even have one blog posts dedicated to “learning to learn”. Continuing on with that tradition, this post will be dedicated to getting you up to speed with Cisco ACI.
Have you ever heard of Microsoft Message Analyzer? While troubleshooting some networking issues with Windows Server 2012, I requested the application owner to install Wireshark. Being a good systems admin, the application owner was naturally suspicious of an application with ‘shark’ in it’s name. Despite my insistence, I wasn’t able to convince the administrator to install Wireshark. We decided to look at alternatives – and came across Microsoft’s own Windows Message Analyzer! (WMA).