Asus WL-320gE User Manual download pdf (Page 55)

5. Appendix

ASUS 802.11g Access Point 55

Chapter 5 - Appendix

on the network segment share total bandwidth. Ethernet networks operate

at 10Mbps using CSMA/CD to run over 10-BaseT cables.

Firewall

A rewall determines which information passes in and out of a network.

NAT can create a natural rewall by hiding a local network’s IP addresses

from the Internet. A Firewall prevents anyone outside of your network from

accessing your computer and possibly damaging or viewing your les.

Gateway

A network point that manages all the data trafc of your network, as well

as to the Internet and connects one network to another.

IEEE

The Institute of Electrical and Electronics Engineers. The IEEE sets

standards for networking, including Ethernet LANs. IEEE standards ensure

interoperability between systems of the same type.

IEEE 802.11

IEEE 802.xx is a set of specications for LANs from the Institute of Electrical

and Electronic Engineers (IEEE). Most wired networks conform to 802.3,

the specication for CSMA/CD based Ethernet networks or 802.5, the

specication for token ring networks. 802.11 denes the standard for wireless

LANs encompassing three incompatible (non-interoperable) technologies:

Frequency Hopping Spread Spectrum (FHSS), Direct Sequence Spread

Spectrum (DSSS), and Infrared. 802.11 species a carrier sense media access

control and physical layer specications for 1 and 2 Mbps wireless LANs.

IEEE 802.11a (54Mbits/sec)

Compared with 802.11b: The 802.11b standard was designed to operate

in the 2.4-GHz ISM (Industrial, Scientic and Medical) band using direct-

sequence spread-spectrum technology. The 802.11a standard, on the other

hand, was designed to operate in the more recently allocated 5-GHz UNII

(Unlicensed National Information Infrastructure) band. And unlike 802.11b,

the 802.11a standard departs from the traditional spread-spectrum technology,

instead using a frequency division multiplexing scheme that’s intended to

be friendlier to ofce environments.

The 802.11a standard, which supports data rates of up to 54 Mbps, is the

Fast Ethernet analog to 802.11b, which supports data rates of up to 11 Mbps.

Like Ethernet and Fast Ethernet, 802.11b and 802.11a use an identical

MAC (Media Access Control). However, while Fast Ethernet uses the same

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Asus WL-320gE User Manual Page 55