XML Firewall Deployment

D.

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

An XML firewall is intended to validate XML before it reaches the application.

Placing the XML firewall between the presentation and application layers, between the firewall and IPS, or between the application and data layers would not serve the intended purpose.

An XML firewall is a type of firewall that is designed to protect against attacks targeting XML-based applications and web services. It inspects incoming and outgoing XML traffic, detects and blocks attacks and vulnerabilities, and enforces security policies.

To effectively deploy an XML firewall in an environment, it is important to consider the location where it can provide the most protection and be most useful.

Option A, "Between the application and data layers", is a commonly recommended location for an XML firewall. This is because the application and data layers are where most XML-based attacks occur, and an XML firewall can effectively block them at this point. An XML firewall at this point can protect the data and ensure the integrity of the application.

Option B, "Between the presentation and application layers", is less commonly used for XML firewalls. The presentation layer is typically where the user interface is, and it is less likely that an attack targeting the XML-based application would occur at this point. Therefore, an XML firewall would not be as effective in this location.

Option C, "Between the IPS and firewall", is not an appropriate location for an XML firewall. An IPS (Intrusion Prevention System) is designed to detect and block attacks at the network layer, while an XML firewall is designed to protect against XML-based attacks at the application layer. Therefore, an XML firewall would not be effective in this location.

Option D, "Between the firewall and application server", is also a common location for an XML firewall. However, this location may not be as effective as option A because an attack may still be able to reach the application before being blocked by the XML firewall. Nevertheless, this location can still provide additional protection to the application server and enforce security policies.

In conclusion, option A, "Between the application and data layers", is the most commonly and effectively deployed location for an XML firewall because it provides the most protection against XML-based attacks and vulnerabilities.