Virtual Labs

Physical Clocks and Clock Synchronization

What is the primary challenge in synchronizing physical clocks in a distributed system?

a: The clocks are too fast Explanation

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b: The clocks are too slow Explanation

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c: The clocks drift at different rates Explanation

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d: The clocks are not accessible Explanation

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In the context of clock synchronization, what is a 'time server'?

a: A server that serves web pages Explanation

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b: A server that provides a reference time Explanation

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c: A server that stores files Explanation

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d: A server that runs a database Explanation

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What is the main idea behind Cristian's algorithm?

a: To slow down all clocks Explanation

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b: To speed up all clocks Explanation

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c: To adjust a client's clock based on a server's time and network delay Explanation

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d: To stop all clocks Explanation

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How does NTP handle the variability of network delay?

a: It ignores it Explanation

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b: It assumes a constant delay Explanation

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c: It uses statistical methods to filter measurements Explanation

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d: It asks the user to input the delay Explanation

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What is the purpose of the hierarchical structure of NTP servers?

a: To make the system more complex Explanation

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b: To distribute the load and improve accuracy Explanation

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c: To make the system less reliable Explanation

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d: To make the system more expensive Explanation

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If a client receives a timestamp from a server, what else does it need to consider before setting its clock?

a: The server's location Explanation

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b: The network round-trip time Explanation

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c: The server's uptime Explanation

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d: The number of users on the server Explanation

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Why is it generally not a good idea to simply set a client's clock backward if it's ahead of the server's time?

a: It can cause events to appear to happen in the past Explanation

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b: It can damage the clock hardware Explanation

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c: It can cause the server to crash Explanation

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d: It can violate the laws of physics Explanation

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How can a system handle the issue of a clock being set backward?

a: By always setting the clock forward Explanation

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b: By gradually slowing down the clock until it's correct Explanation

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c: By ignoring the server's time Explanation

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d: By shutting down the system Explanation

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What is the trade-off between synchronization frequency and network traffic?

a: More frequent synchronization leads to less traffic Explanation

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b: More frequent synchronization leads to more traffic Explanation

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c: There is no trade-off Explanation

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d: The trade-off depends on the time of day Explanation

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