CCNA Networking

With a range of products that support IEEE 802.11a/b/g and soon "n" technologies, Cisco really does offer a pretty complete and impressive line of in-building and outdoor wireless LAN solutions.

802.11n builds upon previous 802.11 standards by adding Multiple-Input Multiple-Output (MIMO), which employs multiple transmitters and receiver antennas to increase data throughput.

Cisco-specific products, take at look at Table 1, which lists the pros and cons of 802.11a, b, and g.

There are two new features of the 5GHz radio that are part of the 802.11h specification: Transmit Power Control (TPC) and Dynamic Frequency Selection (DFS).

The 802.11a standard delivers a maximum data rate of 54Mbps with 12 non-overlapping frequency channels.

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Simply put, IPSec is an industry-wide standard suite of protocols and algorithms that allows for secure data transmission over an IP-based network that functions at the layer 3 network layer of the OSI model.