new ccna study guide 200-301

new ccna study guide 200-301.it is likely to notice that many of the uses of ZigBee are related to control and monitoring. In fact, ZigBee is commonly used for monitoring,building automation, control devices, personal health care devices, and computer peripherals.ZigBee's website says this.ZigBee was created to address the market need for a low-cost, standards-based wireless networking solution that supports low data rates, low power consumption, security and reliability.ZigBee is the only standards-based technology that meets the specific needs of most remote monitoring, control, and sensing network applications. The ZigBee Alliance's initial markets include energy efficiency management, home automation, building automation, and industrial automation You may be wondering how ZigBee technology is related to WLANs and how it interferes with WLANs. The answer is that ZigBee works in the ISM band: the 868MHz band in Europe, the 915MHz band in the US and Australia, and the 2.4GHz band is available almost worldwide. The 2.4GHz operating range is the problem, as this range is the operating range of 802.11b/gWLAN.Some common ZigBee topologies are shown in Figure 8.3, Figure 8.4, and Figure 8.5. Figure 8-3 shows a star topology where the central device is a Network Coordinator ( NC,NetworkCoordinator) o Each network has an NCO Some other devices can be full-featured devices, and some can be lean-featured devices. Full-function devices can do transmit, receive, etc. A lean function device does not have as much performance and can do things like return system temperature reports to the controller.o Streamlined functional devices > full-featured devices. Network coordinatorFigure 8.3 ZigBee star topologyThe cluster topology is shown in Figure &4, which also has an NC,along with some full-featured devices and lite functional devices. In the ,LAN.This clustered topology is similar to an extended star topology. Some situations require that all devices communicate with each other in a coordinated effort to provide some form of information. In this case, you would need a mesh topology, as shown in Figure 8-5