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Denial of Service (DoS) attacks are the work of hackers whose only interest is in bringing a network to its knees This is accomplished by flooding the network with so many requests that it becomes overwhelmed and ceases functioning These attacks are most commonly performed on Web and e-mail servers, but virtually any part of a network can be attacked via some DoS method The secret to a successful DoS attack is to send as many packets as possible against the victim Not only do you want to send a lot of packets, you want the packets to contain some kind of request that the victim must process as long as possible to force the victim to deal with each attacking packet for as long as possible There s a number of ways to get a good DoS going, but the CompTIA Network+ objectives expressly mention a smurf attack A smurf attack is a form of DoS that sends broadcast PINGs to the victim Not only that, the source IP of the PINGs is changed from the real system sending the packet to another (often, nonexistent) machine Smurf attacks are no longer a menace because almost all network devices now know not to forward broadcast PINGs EXAM TIP A smurf attack is a form of DoS that sends broadcast PINGs to the victim Far more menacing than a simple DoS attack are Distributed Denial of Service (DDoS) attacks A DDoS uses multiple (eg, hundreds to hundreds of thousands) of computers under the control of a single operator to send a devastating attack DDoS operators don t own these computers, but instead use malware to take control of computers A single computer under the control of an operator is called a zombie A group of computers under the control of one operator is called a botnet NOTE Zombified computers aren t obvious DDoS operators often wait weeks or months after a computer s been infected to take control of it.

Use NetSonar's Network Mapping Tool to perform a high-level passive analysis (scan) of your network The Mapping Tool collects information such as active IP addresses, ports on each network device, and port banners It then takes this collected information and compares it with the standard rules This comparison is used to identify where potential vulnerabilities may exist and where additional probing is necessary This analysis is performed by the Vulnerability Assessment Engine

To take control of your network s computers, someone has to install malware on the computer Again, anti-malware, training, and procedures will keep you safe from zombification (but feel free to make some joke about eating human brains)

EXAMPLE 26 Write the function f (z) = z + (1/z) in the polar representation What are the real and imaginary parts of the function SOLUTION We write the function in the polar representation by letting z = rei This gives f (z) = z + 1 z

The Vulnerability Assessment Engine takes the results from the Network Mapping Tool and uses well-known exploitation techniques to perform an active analysis technique (probe) This probe confirms each suspected vulnerability and identifies other vulnerabilities not originally detected The Vulnerability Assessment Engine also compares its findings with any additional set of rules you may have defined This feature allows you to customize your probes to satisfy your network's particular requirements There are two ways to customize NetSonar reports: Edit the HTML report after NetSonar generates it This only applies to the current report Assuming a standard installation, the report would be located in C:\Program Files\Cisco Systems\Netsonar\Udo\session name\session data\report name Edit the report template This will apply to all subsequent reports The report template is located in C:\Program Files\Cisco Systems\Netsonar\ ReportComponents

You can t consider a network secure unless you provide some physical protection to your network I separate physical protection into two different areas: protection of servers and protection of clients Server protection is easy Lock up your servers to prevent physical access by any unauthorized person Large organizations have special server rooms, complete with cardkey locks and tracking of anyone who enters or exits Smaller organizations will at least have a locked closet While you re locking up your servers, don t forget about any network switches! Hackers can access networks by plugging into a switch, so don t leave any switches available to them Physical server protection doesn t stop with a locked door One of the most common mistakes made by techs is walking away from a server while still logged in Always log off your server when it s not in use! As a backup, add a password-protected screensaver (Figure 17-1)