Network perimeter security

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  • LANs, WANs, WLANs are known as edge networks May be contained within businesses or homes Needs to be protected from the rest of the Internet! Why firewall? Encryption? Cannot stop malicious packets from getting into an edge network Authentication? Can determine whether an incoming IP packet comes from a trusted user However, not all host computers have resources to run authentication algorithms Host computers managed by different users with different skill levels.

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  • Chapter 8 - Network security topologies. Objectives in this chapter: Explain network perimeter’s importance to an organization’s security policies, identify place and role of the demilitarized zone in the network, explain how network address translation is used to help secure networks, spell out the role of tunneling in network security, describe security features of virtual local area networks.

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  • Module 11 - Creating a security design for network perimeters. In this module, you will learn how to determine threats and analyze risks to network perimeters. You will also learn how to design security for network perimeters, including perimeter networks (also known as DMZs, demilitarized zones, and screened subnets), and for computers that connect directly to the Internet.

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  • Network perimeter Perimeter, dịch ra tiếng Việt có nghĩa là "vành đai", tuy nhiên từ perimeter dùng ở đây có nghĩa khác khái niệm "vành đai" một tí Hacking Security Sites part 20

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  • In this module, students will learn how to determine threats and analyze risks to network perimeters. Students will also learn how to design security for network perimeters, including screened subnets, and for computers that connect directly to the Internet.

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  • The need for complete network security has never been greater nor as well understood. Malicious users threaten to steal, manipulate, and impede information. Numerous solutions address perimeter defense, but the greatest threat of information theft and unauthorized access remains within the internal network boundaries. One point of concern is the relative ease of physical and logical access to a corporate network. Both physical and logical access has been extended to enable a greater level of mobility, providing several benefits to business operations and overall productivity.

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  • Perimeter security solutions control access to critical network applications, data, and services so that only legitimate users and information can pass through the network. This access control is handled by routers and switches with access control lists (ACLs) and by dedicated firewall appliances. A firewall provides a barrier to traffic crossing a network’s “perimeter” and permits only authorized traffic to pass, according to a predefined security policy. Complementary tools, including virus scanners and content filters, also help control network perimeters.

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  • IDC believes that multilayered security solutions offer enterprises a cost-effective and multifaceted alternative to enhance overall infrastructure security posture and improve customer and management confidence levels. By adopting an overwatch architecture with additional security layers that detect and remediate threats that have bypassed perimeter and content security, security managers can reduce the risks of breaches and infections associated with existing unknown security gaps and vulnerabilities.

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  • Static Network Address Translation (NAT) creates a permanent, one-to-one mapping between an address on an internal network (a higher security level interface) and a perimeter or external network (lower security level interface). For example, to share a web server on a perimeter interface with users on the public Internet, use static address translation to map the server’s actual address to a registered IP address. Static address translation hides the actual address of the server from users on the less secure interface, making casual access by unauthorized users less likely.

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  • The Secretary faces a number of threats. Physical threats include poisoning from radiation, chemical or bi- ological toxins. These threats are in addition to threats from explosives and individuals utilizing small arms or other military ordinance. More insidious threats are posed by collection efforts aimed at both the substance of the Secretary’s agenda and those aimed at analyzing security controls in order to compromise them in order to harm the Secretary at some later time.

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  • Intrusion detection systems and vulnerability scanners provide an additional layer of network security.While firewalls permit or deny traffic based on source, destination, port, or other criteria, they do not actually analyze traffic for attacks or search the network for existing vulnerabilities. In addition, firewalls typically do not address the internal threat presented by “insiders.

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  • This module provides students with the knowledge and skills to configure Microsoft® Internet Security and Acceleration (ISA) Server 2000 as a firewall. After completing this module, students will be able to: Secure the ISA Server computer. Explain the use of perimeter networks. Explain the use of packet filtering and Internet Protocol (IP) routing. Configure packet filtering and IP routing. Configure application filters.

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  • Network connections should therefore be protected, at a level based on the risk. The assumption must be that the connecting parties are to a certain degree hostile and have to be strictly constrained to the access for which the connection was agreed. The connecting parties will, after all, have their own security policies and risk management philosophies, and these may vary considerably. Each security management domain will need to apply stringent logical access controls, and should strongly consider using firewalls and related technologies to defend their 'perimeter'....

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  • Our approach to defining a security protocol for sensor networks is resource driven and factors in the trade offs between levels of security and the requisite power and computational resources. Primarily, we envision a scenario where a protected perimeter based on sensors is dynamically deployed. However, similar scenarios could be envisioned in an environment where the topology is well known in advance and the sensor network is pre- configured. Our operating paradigm is where data is reported to a computationally robust central location such as a base station or network controller....

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  • Private Link is no longer supported in the PIX Firewall starting with version 5.0. It is supported in version 4. The Private Link feature allows Virtual Private Networks (VPNs) to be established between PIX Firewalls that are connected to the same public network, such as the Internet. It enables incoming Private Link packets to bypass the Network Address Translation (NAT) and Adaptive Security Algorithm (ASA) features and terminate on the corresponding sending interface of the destination network. A sending interface is the interface from which the IPSec packet was sent from.

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  • IPS-1 is an intrusion prevention system (IPS) that delivers protection from a wide-range of network threats using an IPS-1 Sensor that can be placed either on the perimeter of your network or at any location in your internal network. Some of the benefits of IPS-1 include: Unified security management Mission-critical protection against known and unknown attacks Granular forensic analysis Flexible deployment Confidence Indexing

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