Which task is performed by the Controller?

Question

Options

• ARenewing SSL/TLS Certificates
• BResolving client DNS queries for GSLB
• CRemoving HTTP Headers from the data stream
• DTerminating SSL/TLS

• A
  3% (1)
• B
  87% (26)
• C
  3% (1)
• D
  7% (2)

Explanation

In a GSLB (Global Server Load Balancing) architecture, the Controller functions as an authoritative DNS server - when a client queries for a globally distributed service, the Controller resolves that DNS query and returns the IP of the optimal site based on load, health, and proximity. This is its defining role: directing traffic at the DNS layer before a connection is even established.

Why the distractors are wrong:

• A (Renewing SSL/TLS Certificates) - Certificate lifecycle management is an administrative/PKI function, not something a GSLB Controller performs in the data path.
• C (Removing HTTP Headers) - Header manipulation is a Layer 7 proxy function handled by the load balancer's virtual server or HTTP profile (e.g., F5 LTM), not the Controller.
• D (Terminating SSL/TLS) - SSL offloading happens at the virtual server/listener on the local traffic manager, downstream of the GSLB DNS decision.

Memory tip: The Controller controls where clients go - it answers the "which site?" question via DNS before any real traffic flows. If it touches DNS, think Controller; if it touches live traffic (headers, SSL), think local load balancer.

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