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Access Points and Wireless LAN Controller by Anthony Sequeira

Access Points

If you examine the sample network topology shown in Figure 9-16, you will notice that wireless clients gain access to a wired network by communicating via radio waves with a wireless access point (AP). The AP can then be hardwired to a LAN.

Wireless LANs include multiple standards that support various transmission speeds and security features. However, you need to understand, at this point, that all wireless devices connecting to the same AP are considered to ne on the same shared network segment, which means that only one device can send data to and receive data from an AP at any one time.

Wireless LAN Controller

Access points tend to come in two major types: autonomous and lightweight. Lightweight access points do not have the control plane intelligence built in to perform their functions for the network. These devices are controlled by wireless LAN controllers (WLCs). WLCs are specialized network devices that permit the control and management of large numbers of lightweight access points. WLCs simplify the administration of your access points, and they can also assist you dramatically in the monitoring and ongoing maintenance of the wireless infrastructure.

About The Author

Anthony Sequeira, CCIE No. 15626, is a Cisco Certified Systems Instructor (CCSI) and author regarding all levels and tracks of Cisco Certification. Anthony formally began his career in the information technology industry in 1994 with IBM in Tampa, Florida. He quickly formed his own computer consultancy, Computer Solutions, and then discovered his true passion-teaching and writing about Microsoft and Cisco technologies. Anthony joined Mastering Computers in 1996 and lectured to massive audiences around the world about the latest in computer technologies. Mastering Computers became the revolutionary online training company, KnowledgeNet, and Anthony trained there for many years. Anthony is currently pursuing his second CCIE in the area of Security and is a full-time instructor for the next-generation of KnowledgeNet, StormWind.com. Anthony is also a VMware Certified Professional.

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Network topologies and media types
IP addressing
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Routing, Ethernet switching, and wireless networking
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Remote access
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