DNS can translate a domain name into an IP address. Finding an address does not prove a service is reachable. Latency describes delay; bandwidth describes a link's data-carrying capacity. Compare measurements with matching units.
Worked example
In a simplified test, lookup takes 20 milliseconds and the later request takes 80 milliseconds. Sequential time is 20 + 80 = 100 milliseconds. A successful lookup alone does not prove that the later request will succeed.
Invented Network Tests
Path A has 30 milliseconds of latency and 20 megabits per second of bandwidth. Path B has 70 milliseconds of latency and 100 megabits per second of bandwidth. These invented values describe different properties. A separate service has a successful name lookup but a failed connection. Nothing here requires contacting a real network.