Knowledge Base

Explore practical guides and answers by topic to understand web technologies and discover useful websites.

Answers and Guides

Understanding hreflang: Identifies versions of equivalent content for different languages or regions.
Understanding CDN: Delivers content from edge nodes nearer users and reduces origin load.
Understanding WAF: Detects and blocks some malicious HTTP traffic before it reaches an application.
Understanding A Record: Maps a domain or hostname to an IPv4 address.
Understanding AAAA Record: Maps a domain or hostname to an IPv6 address.
Understanding CNAME Record: Makes one DNS name an alias of another name.
Understanding Authoritative DNS: Publishes the official records for a DNS zone and supplies authoritative answers.
Understanding DNS TTL: Specifies how long a DNS record can be cached.
Understanding IP Address: A numeric address used by a network host or interface for communication.
Understanding Certificate Authority: An organization that validates applications and issues digitally signed certificates.
Understanding Certificate Chain: A validation path from a website certificate through intermediates to a trusted root.
Understanding OCSP: Checks whether a certificate has been revoked by its issuer.
Understanding Certificate Transparency: Records certificate issuance in public, auditable logs.
Understanding HTTP Status Codes: Describes how a server handled an HTTP request.
Understanding HTTP Caching: Uses response headers to control reuse by browsers and intermediaries.
Understanding XSS: An attacker causes untrusted script to execute in another user's website context.
Understanding MIME Types: Tells clients the response format and how to interpret it.
Understanding TXT Records: Publishes text-based verification, mail policies and service configuration in DNS.
Understanding PTR Records: Maps an IP address back to a domain name.
Understanding SOA Records: Describes a DNS zone's primary server, serial number and refresh parameters.