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問題 #195
An administrator logs in to a Linux server and notices the clock is 37 minutes fast. Which of the following commands will fix the issue?
答案：C
解題說明：
The ntpdate command synchronizes the system clock with a remote NTP server immediately, correcting any significant time drift. This is ideal for one-time corrections.
For example:
bash
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ntpdate pool.ntp.org
問題 #196
A Linux administrator is testing a web application on a laboratory service and needs to temporarily allow DNS and HTTP/HTTPS traffic from the internal network. Which of the following commands will accomplish this task?
答案：A
解題說明：
Comprehensive and Detailed Explanation From Exact Extract:
The correct way to temporarily allow specific services in a particular zone with firewalld is to use firewall- cmd --add-service=service --zone=zone. Multiple services can be specified in curly braces and separated by commas. The correct syntax is:
bash
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firewall-cmd --add-service={dns,http,https} --zone=internal
This command will allow DNS (port 53), HTTP (port 80), and HTTPS (port 443) through the firewall for the
"internal" zone temporarily (for the current runtime session).
Other options:
* A. The command syntax is incorrect; firewalld is a service, not a command-line tool.
* B. iptables does not use the --enable-service flag, nor does it have zones in this way.
* D. systemctl mask disables services, and the rest of the command is invalid.
Reference:
CompTIA Linux+ Study Guide: Exam XK0-006, Sybex, Chapter 9: "Networking", Section: "Managing Firewalls with firewalld" CompTIA Linux+ XK0-006 Objectives, Domain 2.0: Networking
問題 #197
A newly hired Linux administrator needs to grant access to the Linux servers by generating a password-protected RSA key of 4096 bytes. Which of the following commands will accomplish this task?
答案：C
解題說明：
The ssh-keygencommand is used to generate SSH key pairs. To generate an RSA key with a length of 4096 bits, the correct syntax is:
-t rsa: Specifies the type of key to generate, which is RSA.
-b 4096: Specifies the number of bits for the key, in this case 4096.
By running this command, the user will be prompted to enter a passphrase to password-protect the key, which satisfies the requirement for generating a password-protected RSA key of 4096 bits.
問題 #198
A systems administrator receives reports from users who are having issues while trying to modify newly created files in a shared directory. The administrator sees the following outputs:
Which of the following provides the best resolution to this issue?
答案：C
解題說明：
This scenario involves shared directory collaboration, which is a common system management task covered in the CompTIA Linux+ V8 objectives. The key issue is that users can create files in the shared directory, but other users in the same group cannot modify those files. This behavior is directly related to group ownership inheritance.
By default, when a user creates a file or directory, it is owned by the user and assigned the user's primary group, not necessarily the group of the parent directory. As shown in the output, files inside /share are owned by different groups (student, student2, student3), which prevents other group members from modifying them, even though the parent directory is group-writable.
The correct solution is to set the setgid (set group ID) bit on the shared directory, making option D correct.
When the setgid bit is applied to a directory, all newly created files and subdirectories inherit the group ownership of the parent directory, rather than the creator's primary group. This ensures consistent group ownership and allows all members of the shared group to collaborate effectively.
The other options are incorrect or poor practice. Option A (setuid) is intended for executables, not directories.
Option B requires constant manual intervention and does not scale. Option C weakens security by granting write access to all users, violating the principle of least privilege.
Linux+ V8 documentation explicitly recommends using the setgid bit on shared directories to manage collaborative access securely and efficiently.
問題 #199
Which of the following is the term used to describe reviewing processes and file operations on a Linux system?
答案：B
解題說明：
Auditing refers to the systematic review and tracking of processes and file operations on a Linux system to ensure accountability, security, and compliance.
問題 #200
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