Linux Understanding Basic Security in Linux

You're managing a web server and suspect unauthorized access attempts. Which logs would be most helpful in identifying these attempts?

• Kernel logs
• Web server access logs
• Package manager logs
• Desktop environment logs

You're creating a new user account on your Linux system. Which permission should the user account NOT have by default?

• Read
• Write
• Execute
• All of the above

You accidentally deleted an important system file. What's the best course of action if you have a recent system backup available?

• Reinstall the entire operating system
• Use a data recovery tool
• Manually recreate the file
• Restore the system from the backup

You're concerned about the physical security of your server. Which security measure is MOST crucial in this regard?

• Update software regularly
• Use strong passwords
• Enable firewalls
• Encrypt the server's hard drive

A user reports they can't access a specific application. You suspect insufficient permissions might be the issue. Which command can help you verify file permissions?

• locate
• ls -l
• ps
• top

You're configuring a firewall and want to block all incoming traffic except for SSH connections on port 22. Which firewall rule would achieve this?

• Allow all traffic except SSH
• Deny all traffic except SSH
• Block port 22
• Permit SSH connections only

While browsing the web, you encounter a message claiming a critical security update is available for your Linux system. How can you safely verify if a legitimate update exists?

• Click the link in the message
• Search the web using the message text
• Check your distribution's official channels
• Contact technical support

You're concerned about password strength and want to enforce complex passwords for user accounts. Which tool can help you achieve this?

• sudo
• passwd
• shadow
• login

You're working on a multi-user system and want to ensure users only access files and directories they are authorized to. What is the core principle behind this security concept?

• User isolation
• Data encryption
• Network segmentation
• Application hardening

You're troubleshooting a network issue and suspect a compromised system might be sending malicious traffic. Which tool can help you identify suspicious outgoing connections?

• netstat
• ping
• traceroute
• ip addr show