In general, firewalls can offer data privacy, integrity,
and availability.
A firewall is often seen as the first step toward a network security solution. Network security needs to be
architected as a foundation for success, and firewalls are an integral part of this architecture.
Firewall deployment requires charting network boundaries between security domains. A network security
domain is a contiguous zone of a network that operates under a uniform security policy. A policy enforcement
mechanism is required where these domains interconnect. This is where firewall technology comes into play.
Firewalls ensure protection by acting as the first line of network defense.
Chapter 6. Cisco Firewalls: Appliance and Module
The firewall has become a common entity and is a necessary and integral part of every network infrastructure.
The most critical requirement in most security solutions today is implementing a firewall. Networks today have
grown both in size and complexity, with the environment becoming increasingly hostile. This chapter brings
together Cisco industry-leading innovative firewall technology with flagship products uniquely positioned to
deliver purpose-built, feature-rich firewall technology.
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