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duplex connections, and support a small number of ports Switches switch frames in hardware (ASICs), use multiple switching methods, support both half- and full-duplex connections, and can support hundreds of ports

Digital Photography QuickSteps Enhancing and Correcting Images PC QuickSteps Getting to Know Your PC

The following Self Test questions will help you measure your understanding of the material presented in this chapter Read all the choices carefully, as there may be more than one correct answer Choose all correct answers for each question

To provide an effective security defense, a company must deal with these three things:

An adversary is a person or persons interested in attacking your network Common adversaries include disgruntled employees, unskilled hackers (script kiddies) and skilled hackers, criminals, other countries, terrorists, competing companies, and others Adversaries motivations range from being challenged (hacker), to gathering or stealing information (competing companies and criminals), to denial of service (terrorists, other countries, and criminals) Adversaries can employ five classes of attacks: passive, active, distributed, insider, and close-in

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A passive attack monitors unencrypted traffic and looks for clear-text passwords and sensitive information that can be used in other types of attacks In an active attack, the attacker tries to bypass or break into secured systems This can be done through stealth, viruses, worms, or Trojan horses, or by exploiting a discovered security vulnerability A distributed attack requires that the adversary introduce code, such as a Trojan horse or back-door program, to a trusted component or software that will later be distributed to many other companies and users Installing this component or software then introduces the exploit, unbeknownst to the user and company, into their network An insider attack involves someone from the inside, such as a disgruntled employee, attacking the network This is the most common type of attack, where the inside attacker attempts to eavesdrop, copy, or cause damage to information An eavesdropping tool, commonly called a sniffing tool, is Wireshark it is free to download and can reveal loads of information about

what is happening in a company s network Another common tool is Ettercap; it s also free, but it also allows you to intercept and inject yourself into connections, including Secure Sockets Layer (SSL) connections A close-in attack involves someone attempting to get physically close to network components, data, and systems in order to learn more about a network This can also lead to the attacker damaging systems, creating a denial of service (DoS)

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Four categories of common threats to networks and their components can occur: physical installations, reconnaissance attacks, access attacks, and denial of service (DoS) attacks The following paragraphs will discuss each of these four threats and mitigation techniques commonly used to thwart and/or defeat these attacks

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Physical installations involve four types of threats: hardware, electrical, environmental, and maintenance Hardware threats involve physical damage to network components, such as servers, routers, and switches To reduce the likelihood of a hardware threat, your critical network components should be placed in a locked room, where only authorized administrators are allowed access To ensure no entry can be gained to the critical network components, the room should not be accessible by a window, air vents, dropped down ceilings, or raised flooring To further reduce the likelihood of someone gaining unauthorized access to the secured room, all entry should be monitored, in and out, via electronic access control and video monitoring

Remember that most threats to a network are internal; therefore,

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Electrical threats include irregular fluctuations in voltage, such as brownouts and voltage spikes, and complete loss of power To mitigate these threats, an uninterruptible power supply (UPS) and backup generator system should be installed for critical network components These should continually be monitored and periodically tested Also, for critical network components, redundant power supplies should be purchased, if supported by the network components

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