The mark of the root domain in the FQDN is represented by a single dot "." This dot signifies the top-level domain in the FQDN hierarchy and separates the root domain from the rest of the domain name components.

Resource records are essential components of the Domain Name System (DNS) and are stored in files with a hierarchical structure. These records contain information such as IP addresses, domain names, and other data necessary for DNS resolution and mapping.
Resource record files contain detailed information about DNS zones, including mappings between domain names and IP addresses, mail exchange records, name server records, and other essential DNS data. These files are crucial for the proper functioning of the DNS infrastructure.
Domain
F5 GTM concept

After creating a DNSSEC Zone, it is essential to submit the DS Record of the Zone to the Admin of the Parent Zone. This step ensures that the parent zone can sign the DS Record with its own keys and upload it to their zone, establishing a chain of trust in the DNSSEC infrastructure.
The process of DNSSEC involves the parent zone signing the DS Record submitted by the child zone with its own keys. This signed DS Record is then uploaded to the parent zone, completing the chain of trust in the DNSSEC setup. Deleting the DS Record would break this chain and compromise the security of the DNS infrastructure.
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F5 GTM Security

F5 GTM plays a crucial role in resolving Fully Qualified Domain Names (FQDN) to their corresponding IP addresses. This is essential for directing traffic to the correct servers based on the domain name requested.
One of the main roles of F5 GTM is to provide intelligent global traffic management across different data centers. It ensures that traffic is efficiently distributed to the most optimal server based on various factors such as server load, proximity, and availability.
F5 GTM is responsible for assuring the high availability of IP application services. It achieves this by monitoring the health and performance of servers, automatically rerouting traffic in case of failures, and ensuring that applications remain accessible to users at all times.
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F5 GTM concept

Having different IP addresses assigned to the same FQDN provides failover capability in case one of the IP addresses goes down. This ensures that the service remains accessible even if one of the IP addresses becomes unavailable, improving the overall reliability and availability of the service.
Domain
F5 GTM concept