Thoughts on CWNP’s Certified Wireless Design Professional (CWDP-302).
The CWDP validates your knowledge of designing wireless networks where you need a pretty good understanding of spectrum, protocols used, security implementation, site surveys – including predictive, manual, hybrid, and validation.
An important part of CWDP, and also in the real world, is being able to gather requirements from the end user. Knowing what the end users need to do on Wi-Fi will help you build a successful network.
Some of the aspects of gathering requirements are straight forward, such as finding out where coverage is needed, what applications are going to be used, is VoIP going to be used, etc.
Knowing what type of devices are going to be used is also important. This plays a role into capacity planning with the applications that will be used. Other areas to consider are designs around regulatory requirements.
This part of the exam takes up 20% so take a look at the objectives. You’ll need to know how these requirements impact the design of a WLAN.
Design takes up 40% of the exam. In this area, experience really gives you a big advantage. Knowing the different architectures such as distributed forwarding and tunnel-based of client data traffic. How someone should design between single channel architecture and multiple channel architecture is something to consider. Although the most important thing is knowing the difference between the two.
Different PHYs will have different capabilities, such as designing for 20 MHz to 160 MHz channel widths. Know what the gotchas are with client devices when designing for a PHY such as 802.11ac.
When it comes to roaming, know the different kinds of roaming technologies and when they would be used. Do you know the difference between opportunistic key caching and PMK caching? Depending on client requirements, this may be important given that some of these roaming methods play a role with latency. Read More