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Wireless LAN technologies are a bit different from everything we have discussed so far First, wireless LAN technologies must contend with many more obstacles than their wired counterparts Obstacles like radio interference, walls and doors, metal girders in the floor, and even microwave ovens can cause signal loss Currently, two major technologies are in use for short-range wireless communication The first is infrared (IR), a line-of-sight technology, meaning that in order to communicate, a clear path must exist between the sending station and the receiving station Even window glass can obstruct the signal Because of this, IR is typically used only for very short-range communications (1 meter or less) at a limited bandwidth (around 1 Mbps), such as data exchange between two laptops or other handheld devices For this reason (because the standard is more like a lap-link standard than a networking standard), we will focus most of our energy on the other technology radio

Radio-based wireless LANs (WLANs) are defined in the IEEE 80211 specification This specification defines a spread-spectrum radio technology over the unlicensed 24-GHz frequency channel, running at 1 to 2 Mbps, with a range between 30 and 300 meters The specification also allows the use of the IR technology, as well as two differing types of spread-spectrum technologies However, direct sequence spread spectrum (DSSS) is the only one of these three technologies that has made it to high speed The other two technologies reach only 1 to 2 Mbps, making them somewhat unattractive for common use For this reason, all of the issues covered in this chapter assume the use of DSSS technology The 80211 technology specification was updated later to the 80211b standard, which defines a speed improvement from 2 Mbps to 11 Mbps This IEEE 80211b standard, which uses DSSS, is quickly becoming widely adopted, and this is the technology we will focus our attention on

Cropping is a method of cutting away portions of the image from any edge Think of it as an electronic paper cutter or reframer If, for example, you were standing too far back when you took the picture and captured detail that you really hadn t intended in the periphery, you can crop the shot to include just the subject you want in the frame You may also want to crop an image that you ve rotated, so that it will be straight again

Wireless communication over the 80211b specification specifies only two devices: an access point (AP) and a station (STA) The AP acts as a bridge device, with a port for the wired LAN (usually Ethernet) and a radio transceiver for the wireless LAN STAs are basically network interfaces used to connect to the AP In addition, the 80211b standard allows for two modes of operation: infrastructure mode and ad hoc mode With infrastructure mode, all STAs connect to the AP to gain access to the wired network, as well as to each other This mode is the most commonly used for obvious reasons The AP controls all access to the wired network, including security, which we will discuss in more detail in the Security section of this chapter In this environment, you would typically place the AP in a centralized location inside the room in which you wish to allow wireless connectivity (such as a cubical "farm") In addition, multiple APs may be set up within the building to allow roaming extending the range of your wireless network With ad hoc mode, no AP is required Rather, the STAs connect to each other in a peer-topeer fashion While this mode allows no connectivity to the wired network, it can be extremely useful in situations in which several PCs need to be connected to each other within a given range

Launch the program and select Domain Security Authenticate. (Under Jaguar Mac OS X 10.2 select Security Authenticate; the program is no longer under Domain.) Enter your password when prompted and click OK (remember, for this technique to work you must have administrator privileges).

The IPX/SPX suite is in many ways less varied than the TCP/IP suite, with fewer protocols, each supporting a specialized function Most of the same functions supported in TCP/IP are

supported in IPX/SPX However, rather than having to choose between 20 different protocols and sometimes many different revisions of the same protocol, IPX/ SPX tends to be more simple one advantage of having a proprietary protocol suite Unfortunately, this simplicity also leads to less variety in implementation, which leads to less flexibility in the suite However, IPX/SPX is still considered by many to be the most efficient suite for LAN environments, with TCP/IP being superior in the WAN arena Let's take a look at the protocols that make up this suite

Select Domain Security Enable Root User. Reauthenticate by selecting Domain Security Authenticate and entering your password.

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