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need an IDS capable of handling multiple links in many different locations The early IDS vendors solved this dilemma by dividing the components and assigning them to separate entities The traffic collection, analysis engine, and signature database were bundled into a single entity usually called a sensor or appliance The sensors would report to and be controlled by a central system or master console This central system, shown in Figure 11-9, consolidated alarms and provided the user interface and reporting functions that allowed users in one location to manage, maintain, and monitor sensors deployed in a variety of remote locations By creating separate entities designed to work together, the network IDS developers were able to build a more capable and flexible system With encrypted communications, network sensors could be placed around both local and remote perimeters and still be monitored and managed securely from a central location Placement of the sensors very quickly became an issue for most security personnel, as the sensors obviously had to have visibility of the network traffic in order to analyze it Because most organizations with network-based IDSs also had firewalls, location of the IDS relative to the firewall had to be considered as well Placed before the firewall, as shown in Figure 11-10, the IDS will see all traffic coming in from the Internet, including attacks against the firewall itself This includes traffic that the firewall stops and does not permit into the corporate network With this type of deployment, the network IDS sensor will generate a large number of alarms (including alarms for traffic that the firewall would stop) that tends to overwhelm the human operators managing the system Placed after the firewall, as shown in Figure 11-11, the NIDS sensor sees and analyzes the traffic that is being passed through the firewall and into the corporate network While this does not allow the NIDS to see attacks against the firewall, it generally results in far fewer alarms and is the most popular placement for NIDS sensors.

5 Which one of the following is not a potentially negative aspect of SCA implementations A More overengineering is possible B Site surveys take longer C Less control is given to the engineer D More APs may be required

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As you already know, NIDSs examine the network traffic for suspicious or malicious activity Here are two examples to illustrate the operation of a NIDS: Port scan A port scan is a reconnaissance activity a potential attacker will use to find out information about the systems he wants to attack Using any of a number of tools, the attacker will attempt to connect to various services (Web, FTP, SMTP, and so on) to see if they exist on the intended target In normal network traffic, a single user might connect to the FTP service provided on a single system During a port scan, an attacker may attempt to connect to the FTP service on every system As the attacker s traffic passes by the IDS, this pattern of attempting to connect to different services on different systems will be noticed When the IDS compares the activity to its signature database, it will very likely match this traffic against the port scanning signature and generate an alarm Ping of death Toward the end of 1996, it was discovered that certain operating systems, such as Windows, could be crashed by sending a very large Internet Control Message Protocol (ICMP) echo request packet to that system The vulnerable operating systems did not handle the packet correctly and

B is correct Site surveys are actually shorter for SCA A, C, and D are incorrect These are all potentially negative aspects of SCA

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6 What is a benefit of the SCA solutions provided by many vendors A More control is given to the engineer B Site survey time is greatly reduced C Fewer APs are needed to cover the same area as MCA D SCA is more standards-based than MCA

would subsequently reboot or lock up after receiving the packets This is a fairly simple traffic pattern for a NIDS to identify, as it simply has to look for ICMP packets over a certain size

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