City Guilds Model Questions Vol1 2017 Information Technology Question 2
Practice objective / multiple choice question 2 from the 2017 City Guilds Model Questions Vol1 Information Technology examination.
A client resolves the domain example.com. The authoritative DNS server returns an A record with TTL 3600 s and the round‑trip time for a query to that server is 150 ms. After 45 min the client requests the same name again (served from cache). After a further 30 min the client's ISP switches to a different DNS resolver that has no cached entry, so the client queries again. Assuming no other queries for example.com occur, what total time in seconds does the client spend waiting for DNS responses across the three queries?
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About This Question
This is City Guilds Model Questions Vol1 2017 Information Technology Question 2. It is one of the objective questions from the 2017 City Guilds Model Questions Vol1 Information Technology examination.
Difficulty level: Medium .
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