Pick one and press Start, then click Next › to step through it.
Watch for
The first lookup's multi-hop walk collapsing to a single hop on the cached repeat — and the NXDOMAIN never entering the cache.
More about this scenario
You'll learn
The full DNS resolution path, why caching makes repeats nearly free, and how failures are handled.
How it runs
Each tier only knows the next one down: root points to the TLD's servers, the TLD points to the domain's own authoritative servers, which hold the record. The answer is kept until its TTL expires; flushing drops it early; a name no server owns comes back as NXDOMAIN.