#netowrk

A practical, production-tested guide to optimizing Linux sysctl parameters, TCP backlogs, socket reuse, BBR congestion control, and file descriptor limits to handle 100k+ concurrent requests without dropped connections.

DNS cache is a temporary database that stores information about previous DNS lookups. In other words, whenever you visit a website, your OS and web browser will keep a record for the domain and the corresponding IP address. This eliminates the need for repetitive queries to the remote DNS servers and allows your OS or browser to resolve the website’s URL quickly.