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ENWLSD 300-425 Exam Prep Notes

Applying Wireless Design Requirements Defining AP coverage – The main goal of the Wi-Fi design to bring the network to the users. Considering Receive Sensitivity – AP Tx power is a major factor in determining the usable range of its signal. Every client device has a receiver that has a sensitivity level or threshold that divides the intelligible, useful signals […]

Remote Frame Captures & Application Issues on Wi-Fi

After the deployment of new Extreme Aerohive Wireless solution at an Enterprise office, a number of user complaints were received for applications resetting and disconnecting while working on Wi-Fi. The users did not have this problem while working from other offices or their home. Some of the applications like Teradata SQL Assistant & other applications which used SQL backend reset […]

Medium Access Methods & QoS Frame Exchanges. #CWAP #Notes #Revision

Contention Algorithms The client STA must locate an AP to which it desires to connect which it does either actively or passively. The 802.11 MAC layer provides the following functions. Scanning – Process used to discover BSS or to discover access points within a known BSS. It can either be done passively (Beacon frames) or actively (Probe Request/Response frames). Synchronisation […]

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 avoidance as opposed to collision […]

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 AP every 100 time units.  […]

Wireless Optimization Tips!

 I have taken into account for a general hospital system where “patient tracking” application is used by doctors and nurses to capture/update patience information.  Patients/Visitors use wireless for their private use along with other hospital staff using wireless network for their day to day work chores. In some instances there might be IoT devices which might include patience monitoring devices/beds […]