City Guilds Model Questions Vol1 2024 Information Technology Question 21
Practice objective / multiple choice question 21 from the 2024 City Guilds Model Questions Vol1 Information Technology examination.
A DNS resolver receives a query for the domain example.com. The resolution path involves a root server (response time 20 ms), a TLD server (30 ms) and an authoritative server (40 ms). The resolver caches the answer with a TTL of 300 seconds. The client makes five queries at times 0 s, 200 s, 310 s, 600 s and 900 s. If a cached answer is used, the lookup takes only 5 ms; otherwise the full resolution time (sum of the three server times) is incurred. Calculate the total time, in milliseconds, spent on DNS resolution for all five queries.
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About This Question
This is City Guilds Model Questions Vol1 2024 Information Technology Question 21. It is one of the objective questions from the 2024 City Guilds Model Questions Vol1 Information Technology examination.
Difficulty level: Medium .
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