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Which of the following commands can be used to display the local routing table? (Choose TWO correct answers.)
The commands that can be used to display the local routing table arenetstatandroute. Both commands can show the kernel routing tables, which contain information about the network destinations and the gateways to reach them. Thenetstatcommand can be used with the-roption to display the routing table, and the-noption to show numeric addresses only. Theroutecommand can also be used with the-noption to display the routing table without resolving names.However, bothnetstatandrouteare considered obsolete and have been replaced by theip routecommand, which is the current recommended way of printing the routing table in Linux12.Reference:
1: Understanding Routing Table - nixCraft
2: How To Display Routing Table In Linux - RootUsers
3: linux networking - What is the local routing table used for? - Server Fault
Which of the following can the chage command NOT change?
The chage command can change the following parameters related to user password expiry and aging:
The last password change date (-d or --lastday option)
The password expiry date (-E or --expiredate option)
The minimum number of days between password changes (-m or --mindays option)
The maximum number of days during which a password is valid (-M or --maxdays option)
The number of days of warning before password expires (-W or --warndays option)
The chage command cannot change the number of days of inactivity after a password has expired before the account is locked. This parameter is controlled by the -I or --inactive option of the usermod command, which modifies the user account information. The chage command only displays the current value of this parameter, but does not allow changing it.Reference:
chage command in Linux with examples - GeeksforGeeks
10 chage command examples in Linux [Cheat Sheet] - GoLinuxCloud
How to Use the Chage Command in Linux -- TecAdmin
How to Manage User Password Expiration and Aging in Linux - Tecmint
Which file, when using Sendmail or a similar MTA system, will allow a user to redirect all their mail to another address and is configurable by the user themselves?
The ~/.forward file is a file that users can create in their home directories to redirect mail or send mail using sendmail or a similar MTA system. The file contains a list of recipient addresses, which can be email addresses, file names, program names, or :include: files. The file must be owned by the user and have the read permission bit set for the owner. The file cannot be a symbolic link or have more than one hard link. The file is processed by sendmail when a recipient address selects a delivery agent with the F=w flag set. If the file contains a backslash, further processing is disabled and the message is delivered to the user's mail-spooling directory. If the file does not exist or cannot be read, it is silently ignored. The ~/.forward file is different from the /etc/aliases file, which is a system-wide file that maps aliases to one or more recipient addresses. The /etc/aliases file is maintained by the system administrator and requires running the newaliases command after any changes. The ~/.alias file is not a valid file for sendmail or similar MTA systems. The /etc/mail/forwarders file is not a standard file for sendmail or similar MTA systems. The ~/.vacation file is a file that contains a vacation message that is sent to the sender when the user is away. The ~/.vacation file is used in conjunction with the vacation program, which can be invoked from the ~/.forward file.Reference:
Which option in the chrony configuration file changes the initial interval of polls to a NTP server in order to speed up the initial synchronization?
The option in the chrony configuration file that changes the initial interval of polls to a NTP server in order to speed up the initial synchronization isiburst. The iburst option allows chronyd to send four requests to the server at intervals of 2 seconds or less, instead of the interval specified by the minpoll option, which is usually 64 seconds.This way, chronyd can make the first update of the clock shortly after start1.The iburst option is recommended for all servers, especially if the network connectivity is not reliable1.
The other options are not valid or do not have the same effect as iburst. The quickstart option does not exist in the chrony configuration file.The fast option is used to specify a fast initial correction of the system clock, but it does not change the polling interval1.The fsync option is used to enable or disable synchronization of the system clock to the real-time clock (RTC) every 11 minutes1.The flood option is used to enable a mode of operation where chronyd sends a burst of requests to the server at a high rate, which can be useful for testing or initial synchronization of a very inaccurate clock1.
LPI Linux Essentials: 1.4. Using sudo
LPI Linux Administrator: 102.5. Use Debian package management
LPI Linux Engineer: 201.1. Measure and Troubleshoot Resource Usage
LPI Linux Professional Certification Program
1
Why is the correct configuration of a system's time zone important?
The correct configuration of a system's time zone is important because it affects how the system displays and interprets the local time from the Unix timestamps.A Unix timestamp is a number that represents the number of seconds that have elapsed since January 1, 1970 (UTC)1.Unix timestamps are independent of time zones and are the same for all systems1.However, when a system needs to display or interpret the local time from a Unix timestamp, it needs to know the offset from UTC, which is determined by the time zone configuration23.If the time zone configuration is incorrect, the system may display or interpret the local time incorrectly, which can cause problems with scheduling tasks, logs, and other applications45.
For example, suppose a system has a Unix timestamp of 1638374400, which corresponds to December 1, 2021, 12:00:00 UTC6. If the system's time zone is configured correctly as UTC, it will display the local time as December 1, 2021, 12:00:00.However, if the system's time zone is configured incorrectly as EST (Eastern Standard Time), which is 5 hours behind UTC, it will display the local time as December 1, 2021, 07:00:00, which is 5 hours earlier than the actual local time6. This can lead to confusion and errors for the system and the user.
Therefore, the correct answer is A. Because the conversion of Unix timestamps to local time relies on the time zone configuration.
