To integrate Global Server Load Balancing (GSLB) with Content Switching (CS), the configuration involves setting up both components to work in tandem. The GSLB virtual server handles the initial DNS-based datacenter selection, while the CS virtual server at the selected datacenter performs more granular, content-based traffic management.

A fundamental requirement for any GSLB configuration is to bind the domain name to the GSLB virtual server (D). This allows the Citrix ADC to respond to DNS queries for that domain.

For the content switching part to function, the CS virtual server (which is configured as a GSLB service) must have policies that direct traffic to appropriate backend load-balancing virtual servers (B). This is the core purpose of content switching.

A. The domain is bound to the GSLB virtual server to handle DNS resolution. Binding it to a CS virtual server would bypass the GSLB decision-making process.

C. This describes an inverse configuration where a CS virtual server forwards traffic to a GSLB virtual server, which is a different and less common use case.

1. Citrix ADC Documentation

"Deploy GSLB with content switching": This document outlines the required high-level steps. It states

"To configure GSLB with content switching

you first configure content switching and then configure GSLB." The GSLB configuration section explicitly lists "Bind the domain name to the GSLB virtual server" as a necessary step. The content switching configuration requires defining policies and binding them to the CS vServer

which in turn target LB vServers.

Source: Citrix Product Documentation

docs.citrix.com/en-us/citrix-adc/current-release/global-server-load-balancing/how-to/deploy-gslb-with-content-switching.html

2. Citrix ADC Documentation

"Binding a Domain Name to a GSLB Virtual Server": This source confirms the necessity of option D. It states

"After you create a GSLB virtual server

you must bind a domain to it. The Citrix ADC appliance then provides the IP address of the GSLB virtual server for DNS requests for that domain."

Source: Citrix Product Documentation

docs.citrix.com/en-us/citrix-adc/current-release/global-server-load-balancing/configuring-gslb-virtual-servers/binding-a-domain-name-to-a-gslb-virtual-server.html

3. Citrix ADC Documentation

"Content Switching Policies": This document clarifies the function of CS policies

supporting option B. It explains that a CS policy evaluates traffic based on an expression

and its associated action directs the request to a target

which is typically a load-balancing virtual server.

Source: Citrix Product Documentation

docs.citrix.com/en-us/citrix-adc/current-release/content-switching/policies.html