I came across a recent issue related to Chromebooks. A particular site with about 200 plus Windows, Apple, Android devices working perfectly fine with no issues. They also had 30 Chromebooks, which constantly had connectivity issues no matter where they were in the building. Looking through the configurations of the Wi-Fi, I noticed nothing that…
CWSP-205 – 802.11 Association
I have previously discussed machine state and 4 Way Authentication briefly, here I want to discuss Open System Authentication specifically 802.11 Association. Before an RSNA is established between two devices they have to first go through Open System Authentication. STA must be Associated and Authenticated to the device. As shown in the picture below following…
Password recovery – Cisco 1841 Router
Password recovery on Cisco Router – config register This is just a quick post for my reference on how to do password recovery on a Cisco Router. Recently I had to do it on a Cisco 1841. Here are my steps: Boot up the router with a console cable and then from terminal emulation software…
Cisco IOS ACL logging with Port numbers
Cisco IOS logging with source and destination ports Recently I had to do some troubleshooting on a Cisco 2911 Router in order to find out if traffic is going from a certain IP address to another. So I did the usual created an extended Access List and then applied it to the interface like this:…
Art of Communication
Not much time to write about some technical stuff so decided to write about some random thoughts going through my mind about Communicating with others, they may be your peers, your family members, customers, management, elders, kids, vendors there is an art to communicate with all of them and in business circles and corporate communication…
Common Cisco WLC commands
Graphical interfaces are cool and some people prefer them period. I however believe that everything has its use and personally I love to utilize command line anytime I can when it comes to troubleshooting, configuring or looking at information. Yes there are times when I do like to use a GUI but especially when it…
CWAP 403 Study Resources
I recently took my CWAP 403 test and after two months of studying I failed in my first try. I scored 63%, 70% is needed to pass the test. It was a failure however I did learn couple of lessons and one of the most important lesson I learned was, “unless I am 200% certain…
CWAP – Group Key Handshake
Group Key Handshake is a two way handshake that happens when an access point needs to deliver a new GTK to all client stations. GTK is used to encrypt the broadcast and multicast traffic. An important thing to remember here is that this is a separate process as opposed to PTK generation, if it was…
CWAP – 802.11 Frames
So with 802.11 there are different types of frames they they all have sub-types. Knowing these frames and where to find them is helpful when capturing data. It is not fun trying to get them in your head when studying for the test, however in my opinion it is easy when you are actually looking…
CWAP 403 – PHY (PLCP)
802.11 is Layer 2 and Layer 1. After frames come to Layer 1 from PPDU pre 802.11-2016 standard shows there are two interfaces PLCP and PMD as show below. NOTE: Per 802.11-2016 there is no longer PMD and PLCP, please read this article R.I.P. PMD by Robert Haviland explaining it really well. Since my post…