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Figure 113 shows the voltage-current curve for a typical 30-cell photovoltaic panel in full sunlight With output terminals shorted, the panel put out its shortcircuit current (here 33 amps) With output terminals not connected, current is zero, but output voltage is the open-circuit voltage (here 180 volts) Maximum power output is achieved at the knee of the curve where the rated current (30 amps) times the rated voltage (147 volts) equals the panel s rated power (44 watts)

1 Which of the following is true concerning WLAN wireless transmissions A B C D A device can send and receive simultaneously CSMA/CD is used to detect and transmit a signal A wireless device will use RTS and CTS signals to avoid collisions Reflection issues are caused by rough plaster on a wall, carpet, and drop-down ceiling tiles

A reconnaissance attack occurs when an adversary tries to learn information about your network He will do this by discovering network components and resources and the vulnerabilities that exist in them Adversaries will commonly use several tools in their attacks: social engineering (pretending to be a trusted source to gain unauthorized access to information), scanning tools, packet sniffers, and other tools

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To mitigate a social engineering attack, users should have to go through proper training about the kinds of information they can and can t share with other people within and outside of the company To mitigate scanning and packet sniffing attacks, good access control mechanisms, such as firewalls and IDS/IPS, should be deployed

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An access attack occurs when someone tries to gain unauthorized access to a component, tries to gain unauthorized access to information on a component, or increases their privileges on a network component Many kinds of access attacks are used, but the most common kind is a password attack In a password attack, the adversary tries to guess a valid password for an existing account She might attempt this kind of attack by using a password cracking program that will use a dictionary to guess common passwords or use a brute-force approach by guessing every combination of numbers, letters, and special characters A brute-force attack might take a long time to break a password, depending on the length of the password and the computing power used to discover the password L0ptcrack and Cain & Abel are very good passwordcracking programs that support the use of brute force; Cain & Abel is even free to download! More commonly, adversaries will use social engineering to trick a user into revealing passwords or installing a Trojan horse to capture keystrokes from a user s PC, including login credentials Some adversaries might even use packet sniffers to examine clear-text connections, such as telnet and FTP, for usernames and passwords To mitigate these kinds of access attacks, strict access control features should be in place Access should be restricted to network components and their information through the use of network filters; for example, only accounting people should be able to access accounting servers and data on those servers This kind of feature can be enforced by access control lists (ACLs) on routers or firewalls, which are covered in more detail in 22 To mitigate Trojan horse attacks, an IDS/IPS and anti-spyware software should be used An example of a good (and free) IDS/IPS tool is SNORT, which can run on many UNIX-based and Windows systems To reduce the likelihood of a brute-force password guessing attack, passwords should contain a combination of letters (upper and lowercase), numbers, and special characters Passwords should be at least 10 characters long, and users shouldn t be allowed to use the same password on multiple network components Many companies use token cards, which use one-time passwords (OTPs) a different, dynamic password is required each time a user logs into a system, making it practically impossible for an adversary to guess the ever-changing dynamic password Another common solution is to encrypt information between two network components so that login credentials cannot be viewed; for example, it is better to use SSH instead of telnet for remote access because SSH encrypts the session traffic SSH is discussed in more depth in 17.

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