DNS Deep Dive

1

How DNS Works

Understand the DNS resolution process from your browser to the authoritative name server.

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2

DNS Record Types Explained

A complete reference to DNS record types: A, AAAA, MX, NS, TXT, CNAME, SOA, and more.

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3

DNS over HTTPS (DoH)

How DNS over HTTPS encrypts your DNS queries and how to enable it on your devices.

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4

DNSSEC Explained: Securing the Domain Name System

Learn how DNSSEC uses cryptographic signatures to protect DNS responses from tampering and prevent cache poisoning attacks.

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5

Running Your Own DNS Resolver

Set up a private DNS resolver with Unbound for faster lookups, better privacy, and custom filtering on your network.

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6

DNS Propagation & TTL: Why Changes Take Time

Understand how DNS caching, TTL values, and propagation delays affect domain changes and how to minimize downtime during migrations.

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7

DNS Caching: How TTL and Cache Work

Learn how DNS caching works at every level -- browser, OS, resolver, and CDN -- and how TTL controls cache freshness.

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8

Authoritative vs Recursive DNS Servers

Understand the two types of DNS servers: authoritative servers that hold records and recursive resolvers that look them up.

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9

DNS Zone Transfers (AXFR/IXFR) Explained

Learn how DNS zone transfers replicate records between primary and secondary servers using AXFR and IXFR protocols.

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10

DNS-Based Load Balancing and GeoDNS

Learn how DNS can distribute traffic across servers using round-robin, weighted records, and geographic routing (GeoDNS).

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11

Reverse DNS and PTR Records

Understand reverse DNS lookups, PTR records, the in-addr.arpa zone, and why reverse DNS matters for email deliverability.

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12

DNS Filtering and Content Blocking

Learn how DNS-based filtering blocks malware, ads, and unwanted content at the network level using tools like Pi-hole and NextDNS.

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13

DNS Amplification Attacks and Defense

Understand how DNS amplification DDoS attacks work, why they are effective, and how to defend your DNS infrastructure.

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14

Public DNS Comparison: Google, Cloudflare, Quad9

Compare the major public DNS resolvers on speed, privacy, security features, and DNSSEC validation.

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15

DNS Monitoring and Troubleshooting Tools

Master DNS troubleshooting with dig, nslookup, and monitoring tools. Diagnose resolution failures, propagation issues, and performance problems.

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