Explore wireless frequencies and how they interact with the environment. Learn about their pitfalls and determine which to choose.
- [Instructor] Wifi's contention based media. … This means that only one device … is allowed to talk at a time. … Think of wifi communication as talking … to your friend with a walkie-talkie. … Only one of you can push the button and talk at a time. … If two devices attempt to send simultaneously … then traffic will collide. … Wifi has a mechanism called CMSA/CA … which is a contention based collision avoidance system … to help prevent collisions. … Wifi devices will sit, listen and wait … for the radio channel it is connected on … to be quiet before it sends. … The industrial scientific and medical or ISM bands … are set aside for all sorts of devices … like telecom and microwave ovens. … So yes, putting your access point … on top of the microwave is a bad idea. … Wifi uses two frequency ranges, … 2.4 gigahertz and five gigahertz. … 2.4 was the original frequency used in wifi … and is still the most prevalent. … The 2.4 gigahertz range is divided into 14 channels, … each spaced five megahertz apart. …
Note: A complete overview of the exam and registration instructions can be found at https://www.cisco.com/c/en/us/training-events/training-certifications/exams/current-list/ccna-200-301.html.
- Network models
- Network components
- Troubleshooting the interface and cable issues
- Configuring IPv4 and IPv6 addressing
- Switching concepts
- Switching configuration
- Wireless architectures
- Wireless security
Skill Level Intermediate
Networking Foundations: IP Addressingwith Timothy Pintello2h 35m Intermediate
1. Network Fundamentals
2. Network Access
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