Discuss LPI 102-500 Exam Topic 6 Question 106

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

A1 0 * * * date $d $t $24

B1 0 * * * ntpdate ntp1.digex.net

C1 0 * * * date ntp1.digex.net

D1 0 * * * runcron date ntp1.digex.net

E1 0 * * * settime $d $t $24

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.

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31 comments · newest first

Lajuana 10 months ago

Wait, can you really set time with crontab like that?

Cordell 10 months ago

I think A looks right too, but not sure.

Kendra 10 months ago

B is the correct one, it uses ntpdate.

Ria 10 months ago

Definitely B, it's the standard way to sync time!

Kristin 10 months ago

C is misleading, it doesn't actually sync time properly.

Frank 11 months ago

I’m a bit confused about the syntax in these options; I don’t recall seeing "runcron" used in crontab.

Edgar 11 months ago

I feel like I've seen a question like this before, and B was the correct answer then too.

Cruz 11 months ago

I'm not entirely sure, but I remember something about using the date command incorrectly in crontab entries.

Cory 11 months ago

I think option B looks familiar since we practiced using ntpdate to sync time.

Ahmad 12 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.

Samira 12 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.

Felicidad 12 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.

Ammie 1 year 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.

Geraldine 1 year 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.

Joanna 1 year 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.

Mireya 1 year ago

I think B is the correct answer because ntpdate is used to synchronize the system clock with a remote server.

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.

Ramonita 1 year ago

↳ replying to Phil

I know, right? Time-related questions always make me feel like I'm in a time warp!

Ramonita 1 year ago

↳ replying to Phil

B) 1 0 * * * ntpdate ntp1.digex.net

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.

Kyoko 1 year ago

I'm not sure, but I think it might be D.

Joanna 1 year ago

I disagree, I believe the answer is C.

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.

Ronald 1 year ago

↳ replying to Yuriko

Yes, I agree. Option B is the correct answer.

Annabelle 1 year ago

↳ replying to Yuriko

I think you're right. Option B is the best choice.

Layla 1 year ago

↳ replying to Yuriko

Option B) 1 0 * * * ntpdate ntp1.digex.net

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.

Jamika 1 year ago

↳ replying to Luther

I'm not sure about the others, but ntpdate is definitely a good choice.

Precious 1 year ago

↳ replying to Luther

I think option C with date ntp1.digex.net could also work.

Huey 1 year ago

↳ replying to Luther

I agree, option B with ntpdate is the way to go.

Mireya 1 year ago

I think the answer is B.

LPI 102-500 Exam - Topic 6 Question 106 Discussion