URLs and domain names (DNS)
Comes up in: Recruiter screen
This concept is being written. It gets the full five steps — explanation, predict, interview angle, practice with tests, and review cards. Here is exactly what it will cover, so you can study it elsewhere in the meantime.
What it covers
- parts of a URL (scheme, host, port, path, query, fragment)
- domain names and subdomains
- DNS lookup step by step (resolver, root, TLD, authoritative)
- caching and TTL
- A, AAAA, CNAME records
Words you will know
What you will practise
- split 10 URLs into parts
dig/nslookupa domain
Interview questions this answers
- What is DNS and why do we need it?