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trunk connection and start tagging frames. This is the default DTP mode for a Cisco switch interface that is trunk-capable. If an interface is set to no-negotiate, the interface is set as a trunk connection and will automatically tag frames with VLAN information; however, the interface will not generate DTP messages: DTP is disabled. This mode is typically used when connecting trunk connections to non-Cisco devices that don t understand Cisco s proprietary trunking protocol and thus won t understand the contents of these messages. If an interface is set to off, the interface is configured as an access-link. No DTP messages are generated in this mode, nor are frames tagged. Table 13-5 shows when switch connections will form a trunk. In this table, one side needs to be configured as either on or desirable and the other side as on, desirable, or auto, or both switches need to be configured as no-negotiate. Note that if you use the no-negotiate mode, trunking is formed but DTP is not used, whereas if you use on, desirable, or auto, DTP is used. One advantage that DTP has over no-negotiate is that DTP checks for the trunk s characteristics: if they don t match on the two sides (for instance, as to the type of trunk), then the trunk will not come up and Remember the DTP the interfaces will remain as an access-link information in Tables 13-4 and 13-5 for connection. With no-negotiate, if the trunking the exam. characteristics don t match on the two sides, the trunk connection will probably fail.

Information is the lifeblood of any organization. However, the value of this information is fully realized only if authorized employees can properly access and share it thus the need for computer networks and access controls. Access to computer networks is traditionally provided through passwords supplied to the user. But, as explained in detail in 1, employees, in the age of password overload, have trouble remembering passwords and thus pick ones that are easy to remember (and easily compromised), or write them somewhere convenient (where they can be easily obtained by unauthorized people). When they do not pick easy ones to remember (like a favorite sports team) or write them down in secret places (like on a sticky note under the keyboard or mouse pad), employees tend to forget their passwords. Thus, many hours are lost and resources squandered as system administrators provide them with new passwords. Biometrics provide a solution by not requiring a person to remember his or her password, saving headaches for users and systems administrators, and most of all by keeping information secure.

gle CW frequency sources, but possess phase noise. Since digital signals carry their information in the phase of the signal, this insertion of phase variances will create increased BER, with the density of the modulation affecting the severity of the BER degradation: The higher-order QAM constellations, such as QAM-256, can be severely degraded at relatively small levels of phase noise. This is because their constellation points are so densely packed, causing their phase/amplitude points to bisect digital decision boundaries. Another major impairment, intermodulation distortion (IMD), will induce noiselike sidebands in a digital system, increasing distortion and decreasing the SNR which degrades the BER as well as creating adjacent channel interference (Fig. 2.33). And analog filters, especially at their band edges, can add significant group delay variations, which force the digital signal to arrive at different times at the filter s output, sometimes causing catastrophic BER problems. Analog filter related amplitude variations that are located within the passband, called ripple, can produce a high BER in many digital systems. Ripple is caused by poorly designed or implemented LC filters. Multipath itself will also create both amplitude impediments (ripple and notches) and

Click the Find Next button to find the next instance of the searched text within the document. All the text objects in the document Paragraph, Artistic, and Fitted Text will be searched, starting with the current page and working to the end of the document. You will be asked whether you want to continue from the start of the document when you reach the end: Clicking Yes takes the search back to page 1, and it will continue through to the start position, so the whole document is checked once. If the search text is not found, CorelDRAW tells you.

Studying vehicle history is similar to looking at any economic phenomenon. iPods are a good example. The first iPod was a novelty; the one hundredth created a strong desire to own one. By the ten thousandth, you own one; by the one millionth, the novelty has worn off; and after the hundred millionth, they re considered ubiquitous. The same with vehicles past events shift the background climate and affect current consumer wants and needs. The innovative Model T of the 1910s was an outdated clunker in the 1920s. The great finned wonders of the 1950s and muscle cars of the 1960s were an anachronism by the 1970s. A vehicle that was once in great demand is now only junkyard material because consumer wants and needs change. Figure 3-1 is rather busy, but studying it gives you clues to the rise and fall of the three types of vehicles in one picture steam, electric, internal combustion plus the interrelationship between them during the three stages of vehicle history. Figure 3-1 shows that steam has been passed by as a vehicle power source but electric vehicles, dominant in urban areas at the turn of the century, are again returning to favor as the majority of the world s industrial nations become urbanized, but petroleum-based fuels are becoming more expensive and availability more politically dependent. Nearly

Drive current (mA) LED optical power output vs. forward drive current (typical)

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If the object you are selecting has well-defined edges, specify high Width and Edge Contrast settings. This will enable you to make a precise selection while roughly tracing the border of the object you re selecting. If the object you are selecting does not have well-defined edges, specify low Width and Edge Contrast settings, and carefully trace the border of the object.