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LPIC-2 - Exam 202 (part 2 of 2), version 4.5 Questions and Answers
What option in the sshd configuration file instructs sshd to permit only specific user names to log in to a system? (Specify ONLY the option name without any values.)
The option in the sshd configuration file that instructs sshd to permit only specific user names to log in to a system is AllowUsers. This option can be followed by a list of user name patterns, separated by spaces, that are allowed to log in. For example:
AllowUsers alice bob
This will allow only alice and bob to log in via ssh. Any other user will be denied access. The AllowUsers option can also take the form USER@HOST to restrict logins to particular users from particular hosts. For example:
AllowUsers email@example.com.* firstname.lastname@example.org
This will allow alice to log in from any host in the 192.168.1.0/24 network, and bob to log in from the host example.com. The AllowUsers option can be used in conjunction with the DenyUsers option, which does the opposite. The allow/deny directives are processed in the following order: DenyUsers, AllowUsers, DenyGroups, and finally AllowGroups.
- sshd_config - OpenSSH SSH daemon configuration file
- Allow Or Deny SSH Access To A Particular User Or Group In Linux - OSTechNix
In order to export /usr and /bin via NFSv4, /exports was created and contains working bind mounts to /usr and /bin. The following lines are added to /etc/exports on the NFC server:
of an NFC-Client, it is observed that /mnt contains the content of the server’s /usr directory instead of the content of the NFSv4 foot folder.
Which option in /etc/exports has to be changed or removed in order to make the NFSv4 root folder appear when mounting the highest level of the server? (Specify ONLY the option name without any values or parameters.)
The fsid option in /etc/exports is used to specify a unique identifier for each exported filesystem. For NFSv4, there is a distinguished filesystem which is the root of all exported filesystems, and it is specified with fsid=root or fsid=0, both of which mean the same thing. If this option is used for the /exports directory, then it will be the root of the NFSv4 hierarchy, and any subdirectories under it will be mounted relative to it. This means that when mounting the highest level of the server, the client will see the content of /exports instead of the NFSv4 root folder. To avoid this, the fsid option should be removed or changed to a different value for the /exports directory, so that it is not the NFSv4 root. The other options in /etc/exports are not relevant for this question.
There is a restricted area in a site hosted by Apache HTTPD, which requires users to authenticate against the file /srv/www/security/sitepasswd.
Which command is used to CHANGE the password of existing users, without losing data, when Basic authentication is being used?
The htpasswd command is used to create and update user files for basic authentication of HTTP users. The command has several options, but the most relevant ones for this question are:
- -c: This option creates a new file and overwrites it if it already exists. This is not suitable for changing the password of existing users, as it would erase the previous data.
- -n: This option displays the results on standard output rather than updating a file. This is useful for generating password records for other types of data stores, but not for modifying an existing file.
- -D: This option deletes the specified user from the file. This is not what the question asks for, as it wants to change the password, not remove the user.
- -b: This option uses batch mode, which means getting the password from the command line rather than prompting for it. This option is not mentioned in the question, and it is not recommended for security reasons.
Therefore, the correct option is B, which uses the default syntax of htpasswd to change the password of an existing user in the specified file. The command will prompt for the new password and update the file accordingly.
- htpasswd - Manage user files for basic authentication
- How to Create and Use .htpasswd
- Unlocking htpasswd in Linux: Comprehensive Guide with Examples