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LPI 102-500 Exam - Topic 6 Question 106 Discussion

Which crontab entry could be used to set the system time at regular intervals?
B) 1 0 * * * ntpdate ntp1.digex.net
A) 1 0 * * * date $d $t $24
C) 1 0 * * * date ntp1.digex.net
D) 1 0 * * * runcron date ntp1.digex.net
E) 1 0 * * * settime $d $t $24

LPI 102-500 Exam - Topic 6 Question 106 Discussion

Actual exam question for LPI's 102-500 exam
Question #: 106
Topic #: 6
[All 102-500 Questions]

Which crontab entry could be used to set the system time at regular intervals?

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Suggested Answer: B

The crontab entry that could be used to set the system time at regular intervals is the one that uses thentpdatecommand to synchronize the system clock with a Network Time Protocol (NTP) server.Thentpdatecommand takes one or more NTP server names or IP addresses as arguments and adjusts the system clock accordingly12.The crontab entry B specifies that thentpdatecommand should be executed at the first minute of the zeroth hour (i.e., 00:01) of every day of every month of every weekday, using the NTP server ntp1.digex.net34. This will ensure that the system time is updated daily with a reliable source.

The other crontab entries are either invalid or ineffective for setting the system time at regular intervals.Thedatecommand can be used to display or set the system date and time, but it requires a specific format for the argument, not an NTP server name5. Theruncronandsettimecommands are not standard Linux commands and their functionality is unknown. The$d,$t, and$24variables are also undefined and meaningless in this context.


by Harris at Jul 05, 2025, 08:15 AM

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Lajuana
7 months ago
Wait, can you really set time with crontab like that?
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Cordell
7 months ago
I think A looks right too, but not sure.
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Kendra
7 months ago
B is the correct one, it uses ntpdate.
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Ria
7 months ago
Definitely B, it's the standard way to sync time!
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Kristin
7 months ago
C is misleading, it doesn't actually sync time properly.
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Frank
8 months ago
I’m a bit confused about the syntax in these options; I don’t recall seeing "runcron" used in crontab.
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Edgar
8 months ago
I feel like I've seen a question like this before, and B was the correct answer then too.
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Cruz
8 months ago
I'm not entirely sure, but I remember something about using the date command incorrectly in crontab entries.
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Cory
8 months ago
I think option B looks familiar since we practiced using ntpdate to sync time.
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Ahmad
9 months ago
I think B is the best answer here. Synchronizing with an NTP server is a reliable way to keep the system time accurate and up-to-date. The other options seem to be using less standard commands or approaches.
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Samira
9 months ago
I'm a bit confused by this question. The different crontab entries all look similar, but I'm not sure which one would actually set the system time correctly. I'll have to review my notes on cron and time management commands.
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Felicidad
9 months ago
Option B looks good to me. Updating the system time via an NTP server is a common way to keep the time accurate. The other options seem a bit more complicated or unclear.
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Ammie
9 months ago
Hmm, I'm not sure about this one. I know crontab is used for scheduling tasks, but I'm not familiar with the different commands that can be used. I'll have to think this through carefully.
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Geraldine
9 months ago
I think the answer is B. Using ntpdate to synchronize the system time with an NTP server seems like the most straightforward way to do this.
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Joanna
11 months ago
I see your point, but I still think C is the right choice because it directly sets the system time using the date command.
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Mireya
11 months ago
I think B is the correct answer because ntpdate is used to synchronize the system clock with a remote server.
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Phil
1 year ago
Ha! I bet the person who wrote this question is a total time lord. They really know how to keep us on our toes with these time-related questions.
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Ramonita
11 months ago
I know, right? Time-related questions always make me feel like I'm in a time warp!
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Ramonita
11 months ago
B) 1 0 * * * ntpdate ntp1.digex.net
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Tammi
1 year ago
Hmm, I'm not too sure about this one. Can we use the date command to set the time as well? I'm a bit confused about the differences between the options.
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Kyoko
1 year ago
I'm not sure, but I think it might be D.
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Joanna
1 year ago
I disagree, I believe the answer is C.
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Yuriko
1 year ago
I agree with Luther. Option B is the correct answer. The other options either don't make sense or don't actually set the system time properly.
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Ronald
11 months ago
Yes, I agree. Option B is the correct answer.
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Annabelle
11 months ago
I think you're right. Option B is the best choice.
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Layla
12 months ago
Option B) 1 0 * * * ntpdate ntp1.digex.net
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Luther
1 year ago
Option B seems like the best choice. Using ntpdate to sync the system time with an NTP server is a common and reliable way to keep the time accurate.
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Jamika
11 months ago
I'm not sure about the others, but ntpdate is definitely a good choice.
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Precious
11 months ago
I think option C with date ntp1.digex.net could also work.
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Huey
1 year ago
I agree, option B with ntpdate is the way to go.
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Mireya
1 year ago
I think the answer is B.
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