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Intrusion detection systems (IDSs) are designed to detect, log, and respond to unauthorized network or host use, both in real time and after the fact IDSs are available from a wide selection of vendors and are an essential part of network security These systems are implemented in software, but in large systems, dedicated hardware is required as well IDSs can be divided into two categories: network-based systems and host-based systems Two primary methods of detection are used: signature-based and anomaly-based IDSs are covered in detail in 11
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Networks comprise connected workstations and servers Managing security on a network involves managing a wide range of issues, from various connected hardware and the software operating these devices Assuming that the network is secure, each additional connection involves risk Managing the endpoints on a case-by-case basis as they connect is a security methodology known as network access control Two main competing methodologies exist: Network Access Protection (NAP) is a Microsoft technology for controlling network access of a computer host, and Network Admission Control (NAC) is Cisco s technology for controlling network admission
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8: Infrastructure Security
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Microsoft s NAP system is based on measuring the system health of the connecting machine, including patch levels of the OS, antivirus protection, and system policies NAP is first utilized in Windows XP Service Pack 3, Windows Vista, and Windows Server 2008, and it requires additional infrastructure servers to implement the health checks The system includes enforcement agents that interrogate clients and verify admission criteria Response options include rejection of the connection request or restriction of admission to a subnet Cisco s NAC system is built around an appliance that enforces policies chosen by the network administrator A series of third-party solutions can interface with the appliance, allowing the verification of a whole host of options including client policy settings, software updates, and client security posture The use of third-party devices and software makes this an extensible system across a wide range of equipment Both the Cisco NAC and Microsoft NAP are in their early stages of implementation The concept of automated admission checking based on client device characteristics is here to stay, as it provides timely control in the ever-changing network world of today s enterprises
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The computer network itself can be considered a large computer system, with performance and operating issues Just as a computer needs management, monitoring, and fault resolution, so do networks SNMP was developed to perform this function across networks The idea is to enable a central monitoring and control center to maintain, configure, and repair network devices, such as switches and routers, as well as other network services such as firewalls, IDSs, and remote access servers SNMP has some security limitations, and many vendors have developed software solutions that sit on top of SNMP to provide better security and better management tool suites The concept of a network operations center (NOC) comes from the old phone company network days, when central monitoring centers monitored the health of the telephone network and provided interfaces for maintenance and management This same concept works well with computer networks, and companies with midsize and larger networks employ the same philosophy The NOC allows operators to observe and interact with the network, using the self-reporting and in some cases self-healing nature of network devices to ensure efficient network operation Although generally a boring operation under normal conditions, when things start to go wrong, as in the case of a virus or worm attack, the center can become a busy and stressful place as operators attempt to return the system to full efficiency while not interrupting existing traffic As networks can be spread out literally around the world, it is not feasible to have a person visit each device for control functions Software enables controllers at NOCs to measure the actual performance of network devices and make changes to the configuration and operation of devices remotely The ability to make remote connections with this level of functionality is both a blessing and a security issue Although this allows
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