There are two system approaches to intrusion

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There are two system approaches to intrusion-detection: host-based which use agents, and network-based which use passive monitors. Host-based systems involve the install of a client application on the system under protection. A management console is used to report from the host system. Network-based systems sit on the network and monitor the network traffic for signs of intrusion. Both systems react when they detect intrusion attempts. Intrusion detection is a proactive internal measure and gives the network some level of security from an 'attack' within the network. The software applications used scan the network traffic for signs of intruders. Most security plans focus on external access and fail to take into account attack from within the physical sites. Intrusion detection software constantly monitors the network for attacks on the servers, odd behavior, incorrect password attempts, etc. The IT staff can receive pager notification of critical events, for instance someone trying to login to the administrator account at 2am on a Saturday. Intruder Detection software includes products from the following vendors: - AXENT, Omniguard Intruder Alert - Cisco, NetRanger - Internet Security Systems, RealSecure
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- Network Flight Recorder, product by same name - Security Dynamics, Kane Security Monitor Most products rely on attack signatures for misuse detection. There are regular updates of signatures. The products can have some negative affect on bandwidth if not properly configured. Some of the products are protocol independent while some scan particular protocols. Most of the products are software based, a few are network appliances. All the products offer robust reporting. Internal Network Segmentation Within some companies the entire user base does not need to see all the systems on the corporate network. This segmentation can be done by the network infrastructure using Ethernet switches to create virtual local area networks (VLANs) which basically creates a series of smaller network segments transparent to the users. Cisco, a manufacturer of Ethernet switches that provide VLAN capability, provides the following benefits of configuring a VLAN. “Virtual LANs (VLANs) offer significant benefits in terms of efficient use of bandwidth, flexibility, performance, and security. VLAN technology functions by logically segmenting the network into different broadcast domains so that packets are only switched between ports that are designated for the same VLAN. A virtual LAN (VLAN) is an arbitrary grouping of nodes on the network. This grouping promotes efficient use of network resources and facilitates productive entry of repetitive network transactions. A virtual LAN allows the network administrator to structure, separate, or partition a network to match the structure and organization used by existing protocols and applications.” The use of Ethernet switches in a corporate network environment also provides for security of data packets sent since the switch provides protection from ‘sniffing’. The
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