Networking Beginner

What is DNS (Domain Name System)?

A hierarchical naming system that translates human-readable domain names into IP addresses.

DNS acts as the internet's phone book. When you type "example.com," DNS resolves it to an IP address like 93.184.216.34. The resolution process involves recursive resolvers, root servers, TLD servers, and authoritative nameservers.

Common record types include A (IPv4), AAAA (IPv6), CNAME (alias), MX (mail), TXT (verification), and NS (nameserver). DNS caching reduces lookup times with TTL (Time To Live) values.

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Related Terms

DNS over HTTPS (DoH)

A protocol that encrypts DNS queries by sending them over HTTPS, preventing eavesdropping and manipulation of DNS traffic.

Network Segmentation

The practice of dividing a network into isolated segments to improve security, performance, and management.

VPN (Virtual Private Network)

A technology that creates an encrypted tunnel between your device and a remote server, securing internet traffic.

A server that sits between clients and backend servers, forwarding client requests and returning server responses on their behalf.

SDN (Software-Defined Networking)

An approach that separates the network control plane from the data plane, enabling centralized, programmable network management.

HTTP Keep-Alive

An HTTP mechanism that reuses a single TCP connection for multiple requests, reducing the overhead of establishing new connections.

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