Where wireless is a passion
In the MAC header is a Frame Control field that is in total 2 bytes, so it has in total 16 bits. Those bits are defined as follows: Protocol Version, this is the version of the 802.11. In the wired network, there are two different versions at this moment. Version 4 and 6 (IPv4 and …
Frame Format Wireless Frames are a little bit different than the Ethernet frames. The Ethernet frame starts with a “preamble” and a “Start-of-Frame Delimiter (SFD).” This is the PHY frame—the wireless frame has this as well, but it is more complex. In this blog, I want to explain the MAC frame. The MAC frame in …
The OSI model is must-know knowledge for everybody that even thinks about toughing the network. Wireless acts at Layer 1 and Layer 2. In this blog, I want to look into the PHY layer (Layer 1), but first an overview. Layer 7 – Application Layer 6 – Presentation Layer 5 – Session Layer 4 – …
There are a several Wireless LAN architectures. For indoor networks, you have the Single MAC model and the Split MAC model. Single MAC model The logic for processing the MAC layer operation is within the access point. We call this a smart access point. Those access points are autonomous/standalone access points and are managed individually. …
Wireless is a shared medium so all clients and access points need to wait on each other before they can transmit data. This is to avoid collisions. Wireless uses Carrier Sense Multiple Access / Collision Avoidance. As we know, 802.3 uses CSMA/Collision Detection. You can compare wireless with a phone call—it is a shared medium …
I am not yet studying for CWSP, but for CWAP, it is necessary to understand the frames when a client connects to an access point. If something goes wrong in the authentication/association you need to understand how to troubleshoot. Before starting with my study notes for CWSP, this is a quick overview of what is …