最新的Lpi LPIC-1 Exam 102, Part 2 of 2, version 5.0 - 102-500免費考試真題
Which file specifies the user accounts that can NOT submit jobs via at or batch? (Provide the full path and filename)
正確答案:
etcatdeny
Explanation:
The /etc/at.deny file specifies the user accounts that can NOT submit jobs via at or batch. The format of the file is a list of usernames, one on each line. Whitespace is not permitted. The superuser may always use at. If the file /etc/at.allow exists, only usernames mentioned in it are allowed to use at. If /etc/at.allow does not exist, /etc/at.deny is checked12. The at and batch commands use the files /usr/lib/cron/at.allow and /usr/lib/cron/at.deny to restrict usage on some systems3. Reference:
at.allow(5) - Linux man page
at.deny(5) [linux man page] - The UNIX and Linux Forums
The at.allow and at.deny files - IBM
Explanation:
The /etc/at.deny file specifies the user accounts that can NOT submit jobs via at or batch. The format of the file is a list of usernames, one on each line. Whitespace is not permitted. The superuser may always use at. If the file /etc/at.allow exists, only usernames mentioned in it are allowed to use at. If /etc/at.allow does not exist, /etc/at.deny is checked12. The at and batch commands use the files /usr/lib/cron/at.allow and /usr/lib/cron/at.deny to restrict usage on some systems3. Reference:
at.allow(5) - Linux man page
at.deny(5) [linux man page] - The UNIX and Linux Forums
The at.allow and at.deny files - IBM
Which of the following is true about IPv6?
正確答案: A
說明：（僅 Fast2test 成員可見）
On a system using system-journald, which of the following command add the message Howdy to the system log? (Choose two correct answers.)
正確答案: A,B
Which configuration file contains the default options for SSH clients?
正確答案: E
說明：（僅 Fast2test 成員可見）
Which of the following files, when existing, affect the behavior of the Bash shell? (Choose TWO correct answers.)
正確答案: B,D
說明：（僅 Fast2test 成員可見）
What is true about the file /etc/localtime?
正確答案: D
說明：（僅 Fast2test 成員可見）
What does the term Braille Display refer to?
正確答案: B
On a system using shadowed passwords, the most correct permissions for /etc/passwd are ___ and the most correct permissions for /etc/shadow are _________.
正確答案: A
說明：（僅 Fast2test 成員可見）
Which command, depending on its options, can display the open network connections, the routing tables, as well as network interface statistics. (Specify ONLY the command without any path or parameters.)
正確答案:
etstatbinnetstatssusrbinss
Explanation:
The netstat command, meaning network statistics, is a command-line utility in the Linux system to display network configuration and activity, including network connections, routing tables, interface statistics, masquerade connections, and multicast memberships1. The netstat command can display different types of network data depending on the command line option selected. Some of the common options are:
-a: This option displays active TCP connections, TCP connections with the listening state, as well as UDP ports that are being listened to.
-r: This option displays the routing table information, which is a list of rules that determine where the packets are sent.
-i: This option displays the network interface information, such as the name, MTU, RX-OK, TX-OK, etc.
-s: This option displays the network statistics by protocol, such as TCP, UDP, ICMP, IP, etc.
For example, to display the open network connections, one can run:
netstat -a
To display the routing table, one can run:
netstat -r
To display the network interface statistics, one can run:
netstat -i
To display the network statistics by protocol, one can run:
netstat -s
For more details and examples, please refer to the web search results1 or the question answering results2. Reference:
https://netref.soe.ucsc.edu/node/7
https://bing.com/search?q=command+to+display+network+connections%2c+routing+tables%2c+and+interface+statistics
Explanation:
The netstat command, meaning network statistics, is a command-line utility in the Linux system to display network configuration and activity, including network connections, routing tables, interface statistics, masquerade connections, and multicast memberships1. The netstat command can display different types of network data depending on the command line option selected. Some of the common options are:
-a: This option displays active TCP connections, TCP connections with the listening state, as well as UDP ports that are being listened to.
-r: This option displays the routing table information, which is a list of rules that determine where the packets are sent.
-i: This option displays the network interface information, such as the name, MTU, RX-OK, TX-OK, etc.
-s: This option displays the network statistics by protocol, such as TCP, UDP, ICMP, IP, etc.
For example, to display the open network connections, one can run:
netstat -a
To display the routing table, one can run:
netstat -r
To display the network interface statistics, one can run:
netstat -i
To display the network statistics by protocol, one can run:
netstat -s
For more details and examples, please refer to the web search results1 or the question answering results2. Reference:
https://netref.soe.ucsc.edu/node/7
https://bing.com/search?q=command+to+display+network+connections%2c+routing+tables%2c+and+interface+statistics