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Figure 6-2 Cisco Systems Security Wheel
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Figure 6-3 A distributed network in which each regional worksite has its own resident file server
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In the centralized model, shown in Figure 6-4, the bulk of computing resources are concentrated in one or just a few data centers As a result, physical access to that data is much more restricted Does this mean that a centralized Application Delivery Infrastructure is inherently more secure than distributed computing It may seem so, but there are numerous areas of concern that make such a blanket assertion shortsighted
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Figure 6-4 A centralized network in which the load-balanced file servers reside all in one place
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Security, Monitoring, and Management
Technical Measures
This section provides more detail on suggested technical measures to ensure enterprise security Measures addressed are the most commonly needed and employed technologies, but the list is not all-inclusive
Firewalls
Network firewalls are the primary line of defense against external security threats; however, a firewall is not a panacea of network security A firewall is a system or group of systems that enforce a boundary between two or more networks In the classic implementation, shown in Figure 6-5, the firewall system is composed of a packet-filtering perimeter router, an isolation LAN (screened subnet) with a dual-homed bastion host, and an interior packet-filtering router
Untrusted
Perimeter router (Packet filter)
Public subnet
Private subnet (Screened) Bastion host Interior router (Packet filter)
Trusted
Figure 6-5 Classic firewall system
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Most firewalls perform a number of different functions, but the following are common capabilities: Protection of internal resources Hides internal addressing schemes and hosts from external detection Authentication Uses strong authentication techniques to verify a user s identity before granting access to corporate information Privacy Protects, via encryption, sessions and data streams destined for a remote network segment over untrusted networks (VPNs) Auditing Provides detailed logging and accounting of communication attempts and other relevant metrics In addition to these common features, firewall solutions should offer the following: Attack and intrusion detection The ability to detect common attacks and intrusion attempts such as denial of service and spoofing Content security A firewall should be application aware for a minimal set of common Internet applications (FTP, SMTP, and so on) It should be possible to define access rules based on the application that is attempting to pass through the firewall High availability The firewall systems should be hardened enough to protect themselves from being brought down by an attack or simple mishap More critical, firewall implementations should be redundant, with automatic failover Electronic countermeasures The ability to mitigate common attacks and intrusion attempts such as denial of service and spoofing, as well as the ability to protect the firewall from direct attack Types of Firewalls Two general types of Internet firewalls are in common use today: Packet-filtering firewalls Filtering firewalls screen packets based on address and packet options They operate at the IP packet level (Layer 3) and make simple security decisions (drop or forward) based on data in the packet header Packet-filtering firewalls may be one of three subtypes: Static filtering This is used on most routers Filter rules must be manually changed and are composed of source and destination pairs as well as protocol and port values No logic is used to determine session state or packet sequence Dynamic filtering In this subtype, an outside process changes the filtering rules dynamically, based on router-observed events (for example, one might allow FTP packets in from the outside, if someone on the inside requested an FTP session) Stateful inspection A technology that is similar to dynamic filtering, with the addition of more granular examination of data contained in the IP packet Dynamic filtering and stateful inspection firewalls keep a dynamic state table to make changes to the filtering rules based on events Application firewalls Application firewalls operate at the application level (Layer 7) and can examine information at that level Application firewalls protect web applications from the growing number of application-layer attacks, including buffer
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