Archive for the ‘802.11e – Quality of Service’ Category

CWAP Beta Course – Day 2

Today was the 2nd day in the CWAP (Certified Wireless Analysis Professional) beta course.  Today’s material was a lot more hand-on / lab type exercise in capturing and analyzing traffic.  From what I could tell, there were three main tools used by the course attendees:

They all seem to have their pros and cons, and they all seem to cost about the same amount of money (especially if you want to do multichannel packet capture on ~3 channels).  Which tool do you prefer?  Why?

The course contains an enormous amount of detail, such as the exact length (in microseconds) for slot times for each PHY type as well as a discussion on the application of that detail (i.e. how do the different slot times affect WLAN performance with and without QoS enabled).

Again, I thought one of the most valuable things were the networking opportunities with the other attendees and the sidebar conversations.  A colleague (and good friend) of mine, Ken Hall, was even inspired to sign up for a Twitter account (@wifiscubaguy) to continue the interaction outside of this course / classroom.  His account will definitely be on my next list of #WirelessWednesday mentions.

Tomorrow is the last day of the course.  From what I know, we are covering a lot of 802.11n concepts, as well as spectrum analysis, which should be a blast.

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What’s Your Favoirte Wireless Blog or News Source?

I recently read an article entitled “Why employees don’t want to blog“.  The article stated that less than 1% of Internet users have an active blog.

Personally, I have a rather hard time finding blogs about Enterprise Wi-Fi networking & security. That being said, there’s a real need for this type of information.

As Nigel Fenwick points out in the video interview below, there is a much bigger value to this online content than one might think due to the high number of people that are engaged as critics, conversationalists, or spectators.

One such person is Andrew VonNagy, who participated in one of my contests offering a “Free Copy of Wireless Hacking Exposed” in exchange for the best wireless pen testing tip.

The funny thing is, by entering the contest, I stumbled onto Andrew’s blog — Revolution Wi-Fi — and realized that Andrew is a wonderful content creator.   For example, over the last several days, Andrew published a great series of posts about Wireless Quality of Service.

This “discovery” motivated me to start another contest. Tell me about a new wireless blog (or news source).  Some of my favorites are already listed along the bottom, left-hand side of WiFiJedi.com Whoever submits the most compelling content will win a free copy of the Certified Wireless Technology Specialist Official Study Guide.

I’ll choose the winner on the next #WirelessWednesday (Aug. 11th)

802.11e Quality of Service – Video

This is a portion of some internal training that I delivered at the beginning of the year.  Certainly not my best stuff, but the video was readily available (thanks to my friend Gary) and I thought that it was useful content about 802.11e, which is Quality of Service.

The video is approximately 5 minutes in length and discusses the media contention mechanism under 802.11e – Hybrid Coordination Function (HCF).  There are two main parts to HCF (which I discuss in the video):

  1. Enhanced Distributed Channel Access (EDCA)
  2. Hybrid Controlled Channel Acccess (HCCA)
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