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최신 LPIC Level1 102-500 무료샘플문제 (Q74-Q79):

질문 # 74
Which of the following is observed and corrected by a NTP client?

A. The skew in time between the system clock and the hardware clock.
B. Changes in the time zone of the current computer's location.
C. Adjustments needed to support Daylight Saving Time.
D. The skew in time between the system clock and the reference clock.

정답：D

설명：
The Network Time Protocol (NTP) is a protocol that enables the accurate synchronization of time and date information across networked computer systems. NTP uses a hierarchical system of time servers, where each server has a stratum level that indicates its distance from the primary reference source. The primary reference source is usually an atomic clock or a GPS receiver, which provides the Coordinated Universal Time (UTC).
The NTP clients are the computer systems that want to synchronize their system clocks with the UTC. The system clock is a software clock that runs in the kernel and keeps track of the current time and date. The system clock can be influenced by various factors, such as the hardware clock, the CPU frequency, the temperature, the load, and the network latency. These factors can cause the system clock to drift or skew from the UTC, resulting in inaccurate timekeeping. A NTP client observes and corrects the skew in time between the system clock and the reference clock, which is the clock of the NTP server that the client is connected to.
The NTP client periodically sends requests to the NTP server and receives the server's time stamps. The NTP client then calculates the offset and the round-trip delay between its system clock and the reference clock, and adjusts its system clock accordingly. The NTP client can also use multiple NTP servers and apply algorithms to select the best one and filter out outliers. The NTP client can also discipline the system clock by using a feedback loop that controls the clock frequency and reduces the clock drift. By using NTP, the system clock can achieve a high accuracy and precision, usually within a few milliseconds or microseconds of the UTC123.
The other options are not correct. The skew in time between the system clock and the hardware clock is not observed and corrected by a NTP client, but by a separate utility called hwclock, which can read and set the hardware clock. The hardware clock is a battery-powered device that keeps time even when the system is powered off. The hardware clock is usually less accurate than the system clock, and can be synchronized with the system clock at boot or shutdown time. The changes in the time zone of the current computer's location are not observed and corrected by a NTP client, but by a configuration tool called timedatectl, which can set the system time zone and other parameters. The time zone is a geographical region that has a uniform standard time and date. The time zone does not affect the system clock, which always keeps the UTC, butonly the display of the local time and date for the user. The adjustments needed to support Daylight Saving Time (DST) are not observed and corrected by a NTP client, but by the system's time zone database, which contains the rules and transitions for DST. DST is a practice of advancing the clocks by one hour during summer months to make better use of daylight. DST is not observed in all regions and countries, and can vary in start and end dates. The system's time zone database is updated regularly to reflect the changes in DST rules, and can be applied tothe system clock to calculate the correct local time and date. References: 1: Network Time Protocol
- Wikipedia 2: How NTP Works - NTP Pool Project 3: How To Set Up Time Synchronization on Ubuntu
20.042 : hwclock(8) - Linux manual page : timedatectl(1) - Linux manual page : Daylight saving time - Wikipedia

질문 # 75
On a system running the KDE Display Manager, when is the /etc/kde4/kdm/Xreset script automatically executed?

A. When KDM starts
B. When X is restarted
C. When KDM crashes
D. When a user's X session exits
E. When X crashes

정답：D

설명：
The /etc/kde4/kdm/Xreset script is a script that runs as root after a user's X session exits. It can be used to perform some cleanup tasks or other actions that need to be done when the user logs out of the graphical environment. For example, it can reassign the ownership of the console to root, or shut down the system if desired. The /etc/kde4/kdm/Xreset script is part of the KDE Display Manager (kdm), which is a graphical login manager for X. KDM can be configured to run this script by setting the Reset key in the [X-*-Core] section of the /etc/kde4/kdm/kdmrc configuration file. References:
* kdm.options - configuration options for X display manager
* kdm(1) - kdm - Debian jessie - Debian Manpages
* debian - How to get system to shutdown when Xorg is quit? - Unix ...

질문 # 76
Which command, available with all MTAs, is used to list the contents of the MTA's mail queue? (Specify ONLY the command without any path or parameters.)

정답：

설명：
mailq, /usr/bin/mailq, sendmail -bp, /usr/sbin/sendmail -bp, /usr/lib/sendmail -bp, sendmail, /usr/sbin/sendmail, /usr/lib/sendmail

질문 # 77
Which of the following programs uses the hosts.allow file to perform its main task of checking for access control restrictions to system services?

A. fingerd
B. mountd
C. tcpd
D. xinetd
E. inetd

정답：C

질문 # 78
Which of the following words is used to restrict the records that are returned from a SELECT SQL query based on a supplied criteria for the values in the records?

A. WHERE
B. CASE
C. FROM
D. IF

정답：A

설명：
The SQL WHERE clause is used to restrict the records that are returned from a SELECT SQL query based on a supplied criteria for the values in the records12. The WHERE clausefollows the SELECT and FROM clauses and contains one or more conditions that must be true for a record to be included in the result set. The general syntax of the WHERE clause is:
SELECT column1, column2, ...
FROM table_name
WHERE condition;
The condition can be a comparison, a logical operation, a pattern matching, a subquery, or a combination of these using various operators12. For example, the following query selects all the records from the customers table where the country is 'USA':
SELECT * FROM customers
WHERE country = 'USA';
The other words listed in the question are not used to filter records based on values. They have different meanings and purposes in SQL:
* CASE: This is a conditional expression that returns a value based on a set of conditions3. It can be used in SELECT, UPDATE, DELETE, or WHERE statements. For example, the following query uses a CASE expression to assign a rating to each customer based on their credit limit:
SELECT customer_name, credit_limit, CASE WHEN credit_limit > 10000 THEN 'High' WHEN credit_limit
> 5000 THEN 'Medium' ELSE 'Low' END AS rating FROM customers;
* FROM: This is a clause that specifies the table (s) or view (s) from which the data is retrieved. It follows the SELECT clause and precedes the WHERE clause. For example, the following query selects the customer name and order date from the customers and orders tables:
SELECT customer_name, order_date FROM customers JOIN orders ON customers.customer_id = orders.customer_id;
* IF: This is a control flow statement that executes a block of code based on a condition. It can be used in stored procedures, functions, triggers, or batch files. For example, the following code snippet uses an IF statement to check if a variable is positive or negative:
DECLARE @num INT; SET @num = -10; IF @num > 0 BEGIN PRINT 'Positive'; END ELSE BEGIN PRINT 'Negative'; END References: 1: SQL WHERE Clause - W3Schools 2: How to Write a WHERE Clause in SQL | LearnSQL.com 3: [SQL CASE Statement - W3Schools] : [SQL FROM Clause - W3Schools] : [SQL IF...ELSE Statement - W3Schools]

질문 # 79
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102-500최신버전덤프 & 102-500최신버전인기시험자료

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최신 LPIC Level1 102-500 무료샘플문제 (Q74-Q79):

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