For a Citrix ADC to compress traffic from a back-end resource, compression must be explicitly enabled on the service object representing that resource. While binding a compression policy to a virtual server is also a necessary configuration step, the policy will have no functional effect if the associated services are not enabled for compression. The service-level setting acts as the primary switch that makes a service's traffic eligible for compression. Therefore, enabling compression on the service is a foundational step required to effectively use any bound compression policies, including the default ones.

A. Selecting a compression algorithm is a parameter within a compression action/profile, not the primary step to activate a policy.

B. Disabling the Citrix ADC compression feature at a global level would prevent any compression from occurring, which is the opposite of the goal.

D. Binding a policy is a required step, but it is ineffective if compression is not enabled on the service, making the service-level enablement a critical prerequisite.

1. Citrix ADC 13.1 Product Documentation. Compression. In the section "Enable compression on a service

" the documentation states

"For the Citrix ADC to compress the response from a particular server

you must enable compression for the service that represents the server." This highlights that enabling compression on the service is a mandatory prerequisite for the feature to function for that service's traffic. (Source: Citrix Official Documentation

docs.citrix.com/en-us/citrix-adc/current-release/optimization/compression.html

Section: "Enable compression on a service").

2. Citrix ADC 13.1 Product Documentation. Compression. The section "Configuring Basic Compression" outlines the necessary steps

which include both enabling compression on services and binding policies. It lists "Enabling compression on the services that will be sending compressible data" as a key part of the basic configuration

reinforcing its role as a fundamental requirement. (Source: Citrix Official Documentation

docs.citrix.com/en-us/citrix-adc/current-release/optimization/compression.html

Section: "Configuring Basic Compression").