Troubleshooting WLAN issues with 802.11 Frames – #CWAP9

I have pen down a some troubleshooting scenarios which I’ve come across while studying for CWAP exam. To begin with, Management Frames > Foundation of how wireless radios detect, join and operate on WLAN.Control Frames > Frames which control the delivery of Data frames. Data Frames > Carry actual data payload from/to layers 3-7. Some…

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How to capture WLAN Frames? #CWAP8

This blog post will focus on tools I’ve used for performing Wireless Frame Captures. I’ve been largely dependent on Macbook for capturing the wireless frames. I would highly suggest you for sourcing a Macbook for frame capture as Windows PC option involves getting a third party WLAN pcap which is not cheap. Thank you Apple…

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802.11 Frame Exchanges – Security #CWAP7

802.11 Frame Exchanges section account for 25% of syllabus for CWAP-403 exam. Potentially around 15 questions out of 60 in the exam can be expected from this section. This blog post focuses on the “security” component of 802.11 Frame Exchange. I will be focusing on other sections in the subsequent posts in the next week…

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WLAN Medium Contention – #CWAP6

Accounts for 10% of the CWAP knowledge domain areas, approx. 6/60 questions Medium Contention :Protocols that allow large number of devices to effectively share the wireless channel. All AP & STAs will contend with each other on a common transmission medium. CSMA / CA – The AP/STAs (802.11) use carrier sense multiple access with collision…

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PHY Layer – CWAP#5

This chapter accounts for 10% of the Knowledge Domain in the CWAP exam. Approx. 6/60 questions! Exam Moment from the Book : It is not important, for the CWAP exam, that you know all the details of the variations of the PHY preambles; however, you should know that the preamble adds extra overhead to the…

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Key 802.11 Frames – CWAP#3

This post covers the important 802.11 Frames which can help in performing the analysis and troubleshoot any issues related to WLAN networks. I have referenced Wireshark filters for the ease of each frame. Beacon (1000, Subtype : 8) (wlan.fc.type_subtype == 0x08) Used to announce the Basic Service Set (BSS) for the Client (STAs). Transmitted by…

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How did I Decipher 802.11 Frames! #CWAP-2

Main Objective: To successfully transfer every bit of information(data) from one device to another. 802.11 MAC HEADER Let us now go through the basics of the frame header and the components. I have captured a simple beacon (management) frame using Wireshark. I will briefly explain each of the fields. Notice the number in the bracket…

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CWAP 403 – Start >

I will be summarising each chapter on the Certitrek Publishing – Official Study Guide for CWAP 403 Exam. I’ve learned plenty of concepts from the first chapter – 802.11 – The Protocol. This is one of the chapters which you have to read and learn. One may not learn the contents of this chapter directly…

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