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a series of towers on hills People in one tower would look at the next through a telescope to see what it was signaling They would then send the same signal to the next tower The process could be repeated indefinitely There s no indication that Hooke s system was ever built in his lifetime, but Claude Chappe came up with a version in 1790 that eventually covered all of France and spread from there across the globe Today, we refer to that form of signaling, with arms swinging into various positions, as semaphore Because messages could travel hundreds of miles in mere minutes, however, Chappe originally planned to call his system the tachygraphe (speedy writing); Miot de Melito suggested telegraphe (distant writing) instead, which Chappe adopted by 1792 A traveler today encounters many sites called Telegraph Hill; these are all reminders of systems of visual telegraphy Even before Chappe, people tried applying electricity to telegraphy, but the only versions of that form of energy then available were either lightning (powerful, but not very reliable) or static Nevertheless, it s possible that electric signaling was demonstrated before 1736, and messages may have been sent electrically from Madrid to Aranjuez (about 26 miles, or the distance of a marathon) by the Spanish royal family beginning in 1798 Two years later, Alessandro Volta brought the world into the Volt Age with the battery, and reliable sources of continuous electrical current became available Almost immediately, people began trying to apply electrical current to the problems of telegraphy Don Francisco Salva, who had built the Madrid system, suggested in 1804 using electrolysis of water into hydrogen and oxygen bubbles as a means of telegraph message reception Indeed, just a few years later, Samuel von Soemmerring built a multi-wire telegraph using bubbles in a water tank as the indicator Each letter and number had a wire, and bubbles emanating from that wire indicated transmission In a way, it could be considered an early TV set: People stared intently at a glass faceplate to watch information transmitted electrically That s not how the telegraph created videography, however Baron Pavel Lvovich Schilling, a diplomat in the Russian.

Multiple-factor authentication is simply the combination of two or more types of authentication Three broad categories of authentication can be used: what you are (for example, biometrics), what you have (for instance, tokens), and what you know (passwords and other information) Two-factor authentication combines any two of these before granting access An example would be a card reader that then turns on a fingerprint scanner if your fingerprint matches the one on file for the card, you are granted access Three-factor authentication would combine all three types, such as a smart card reader that asks for a PIN before enabling a retina scanner If all three correspond to a valid user in the computer database, access is granted EXAM TIP Two-factor authentication combines any two methods, matching items such as a token with a biometric Three-factor authentication combines any three, such as a passcode, biometric, and a token Multiple-factor authentication methods greatly enhance security by making it very difficult for an attacker to obtain all the correct materials for authentication They also protect against the risk of stolen tokens, as the attacker must have the correct biometric, password, or both More important, it enhances the security of biometric systems Multiple-factor authentication does this by protecting against a stolen biometric Changing the token makes the biometric useless unless the attacker can steal the new token It also

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2 A wireless technology professional is calculating cell sizes for a WLAN deployment What kind of architecture is she most likely prepping for A SCA B MCA C Mesh D WiMAX

reduces false positives by trying to match the supplied biometric with the one that is associated with the supplied token This prevents the computer from seeking a match using the entire database of biometrics Using multiple factors is one of the best ways to ensure proper authentication and access control

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B is correct MCA uses cell sizing A, C, and D are incorrect SCA does not use cell sizing Mesh does not use cell sizing WiMAX is not a WLAN technology but rather a wireless MAN solution

Physical Security is required to maintain the security of information systems Any person with malicious intent who gains physical access to a computer system can cause significant damage If a person can gain physical access, almost no information security safeguard can truly protect valuable information You have seen how access controls can provide legitimate access while denying intruders However, you have also seen how these systems are increasingly computer- and network-based, which can cause a separate path of attack to be generated Physical access can be compromised through the use of information systems As the tendency to use the IP network increases for every device in the organization, more and more interlinked systems will require interlinked security requirements This is the concept of convergence, which can apply to security as well as voice, video, and data

3 Which of the following are potentially negative aspects of MCA implementations (Choose two) A Longer site survey times B Shorter site survey times C More ongoing maintenance D Extensive overengineering

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