XML Firewall Deployment Locations

D.

XML firewalls are most commonly deployed in line between the firewall and application server to validate XML code before it reaches the application.

An XML firewall is a security device or software that is designed to protect XML-based web services and applications from various types of attacks such as injection attacks, denial-of-service attacks, and more. It can also perform various security-related functions such as access control, content filtering, message routing, and more.

In terms of deployment, an XML firewall is most commonly deployed between the presentation and application layers of the environment. This is because the presentation layer is responsible for the user interface and displaying information to users, while the application layer is responsible for processing and managing data. As such, an XML firewall can inspect and filter incoming and outgoing XML messages at the boundary between these two layers, which allows it to detect and prevent various types of attacks before they can reach the application layer.

Option A, between the application and data layers, is incorrect because an XML firewall does not typically operate at this layer. The data layer is responsible for managing and storing data, while the application layer is responsible for processing and manipulating data. An XML firewall is primarily concerned with protecting web services and applications, not data storage.

Option B, between the IPS and firewall, is also incorrect because an XML firewall is not typically deployed in this location. An IPS (Intrusion Prevention System) is a security device or software that is designed to detect and prevent various types of network attacks, while a firewall is a network security device that monitors and controls incoming and outgoing network traffic. While an XML firewall may work in conjunction with an IPS and firewall, it is not typically deployed between them.

Option D, between the firewall and application server, is also incorrect because an XML firewall is typically deployed before the firewall, not after it. Placing an XML firewall between the firewall and application server may limit its effectiveness since the firewall may already block many types of attacks before they reach the XML firewall.

In summary, an XML firewall is most commonly deployed between the presentation and application layers of the environment, where it can inspect and filter incoming and outgoing XML messages at the boundary between these two layers.