Certainly, here's a summary of the information you've provided about authoritative name servers and DNS zones:

Authoritative Name Servers and DNS Zones:

• Authoritative name servers are responsible for specific DNS zones.
• DNS zones are hierarchical and divide responsibilities for different parts of domain names.
• Root name servers handle the root zone, TLD name servers handle specific TLD zones, and authoritative name servers handle subdomain zones.
• The concept of zones allows for better control over multiple levels of a domain.

Zone Organization:

• Zones don't overlap; each zone has its own administrative authority.
• Zones can be split to manage resource records more efficiently.
• Zone files are used to configure zones and contain resource record declarations.
• Zone files include Start of Authority (SOA) records, indicating the authoritative name server, and NS records for additional name servers responsible for the zone.

Multiple Servers and Redundancy:

• While we often refer to a singular server responsible for a zone, there are typically multiple physical servers involved.
• Using multiple servers ensures redundancy and fault tolerance for DNS traffic.
• In case one server fails, others can continue serving DNS requests.

Zone Configuration:

• Zone files contain various types of resource record declarations, including A, Quad A, and CNAME records.
• They may also include default Time-to-Live (TTL) values for records.
• Zones can be configured multiple levels deep, but this is rare due to complexity.