The ZoneRunner is a GUI interface specifically designed for editing the BIND configuration. It provides a user-friendly way to make changes to the configuration settings related to DNS zones.
Within the context of F5 GTM, the ZoneRunner is a graphical tool that facilitates the creation and management of database files. This functionality is crucial for organizing and storing data related to DNS zones and records efficiently.
As a GTM utility, the ZoneRunner plays a key role in managing and configuring various aspects of the Global Traffic Manager system. It offers a user-friendly interface for handling tasks related to DNS zones and ensuring smooth traffic management.
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F5 GTM concept

In F5 GTM, if the first virtual server within a pool is not available, the GTM will automatically choose the next best virtual server based on the load balancing mode assigned to the pool. This ensures that client requests are still directed to an available server to maintain service availability and performance.

In a Topology load balancing configuration, Round Robin is a valid secondary load balancing type option. It distributes traffic evenly across all available servers in a circular sequential manner, ensuring each server receives an equal share of requests.

The "TXT" record format can be either unstructured text format or structured format, depending on the specific requirements and configurations set by the user. This allows for flexibility in storing textual information within the DNS system.
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F5 GTM concept

The emergency rollover approach recommended by F5 is to generate a duplicated version of the key with a similar name. This ensures that there is a backup key available in case the primary key becomes compromised or needs to be rotated quickly.
Assigning both versions of the key to the same zone ensures that both keys are available and can be easily managed within the same zone. This simplifies key management and ensures that the backup key is readily accessible when needed.
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F5 GTM Security