Member Avatar for Fyrbeast

1. Elaborate on the following on DNS:
DNS is both a telephone "White Pages" and a "Yellow Pages"
The DNS namespace
The hierarchy of DNS servers and how they work as a team to resolve DNS queries.

I really only need assistance on the first part.............Can anyone tell me where to look for information concerning this? Every link I have tried has turned up a dead end.

Thanks a bunch peeps

fyrbeast

  • 2 Contributors
  • 3 Replies
  • 116 Views
  • 8 Hours Discussion Span
  • Latest Post Latest Post by jbennet

Dani AI

Generated

Good start by — that phone-book metaphor is helpful. Here is a concise, practical expansion that fills the gaps and points to reliable references.

DNS roles (forward vs reverse)
DNS does two related jobs. Forward resolution maps a domain name to a network address (A/AAAA/CNAME records). Reverse resolution maps an IP back to a name using PTR records in the special reverse zones (in-addr.arpa for IPv4, ip6.arpa for IPv6). Reverse DNS is controlled by whoever manages the IP block (often the ISP), so PTRs may not match a forward name.

The namespace and zones
The DNS namespace is a hierarchical tree of labels (root at "."). Top-level domains (TLDs) are delegated from the root. A zone is a contiguous portion of that tree served by one set of authoritative name servers and described by a zone file (SOA, NS, A/AAAA, MX, TXT, etc.). Delegation is performed by NS records in the parent, and when an authoritative server’s hostname is inside the delegated zone you need glue A/AAAA records at the parent.

How the servers work together
Typical flow: a client stub asks a recursive resolver. The resolver either returns a cached answer or performs iterative queries: root -> TLD -> authoritative. Caching and TTLs speed lookups but can cause propagation or staleness issues. Common problems include missing/incorrect NS delegation, absent glue records, DNSSEC errors, or TTL-related confusion.

Quick diagnostic tips and reading
To watch the path use dig +trace example.com and to test reverse use dig -x 1.2.3.4. For standards and deeper detail read RFC 1034 and RFC 1035. For an accessible primer see Cloudflare’s guide: What is DNS?. Root/TLD info is at IANA Root Servers.

Recommended Answers

All 3 Replies

Member Avatar for jbennet

Its both a white pages and a yellow pages in so far that it can do;

Yellow pages - names to telephone numbers
White pages (reverse directory) - telephone numbers to names

Except with a DNS server its IP addresses instead of telephone numbers

Member Avatar for Fyrbeast

Thanks for the remarks. I sat and pondered the concept for a bit, and came to a similar conclusion.

Member Avatar for jbennet

marked as solved ok?

Be a part of the DaniWeb community

We're a friendly, industry-focused community of developers, IT pros, digital marketers, and technology enthusiasts meeting, networking, learning, and sharing knowledge.