Linux SSH Security Hardening Quiz

1. What is the default SSH port number?

22

2222

443

8022

2. Disabling root login via SSH is a security best practice.

True

False

3. What does the 'PermitRootLogin' directive control in sshd_config?

Whether root can log in via SSH

The number of login attempts allowed

The encryption algorithm used

The SSH port number

4. Which SSH key type is considered more secure for modern systems?

RSA 4096-bit

DSA

ECDSA

MD5

5. Which directive limits the number of concurrent SSH sessions per user?

MaxAuthTries

MaxSessions

LoginGraceTime

ClientAliveInterval

6. Changing the default SSH port reduces security threats.

True

False

7. Port forwarding via SSH can introduce security risks if not properly configured.

True

False

8. Which option prevents SSH login using empty passwords?

PermitEmptyPasswords no

PasswordAuthentication no

StrictModes yes

PubkeyAuthentication yes

9. SSH keys should be protected with a passphrase.

True

False

10. Which SSH configuration directive disables password authentication and forces key-based login?

PasswordAuthentication no

PubkeyAuthentication yes

PermitRootLogin no

AllowUsers admin

11. Which SSH protocol version should be used for modern security?

SSH version 1

SSH version 2

Both versions equally

SSH version 3

12. What is the purpose of the 'LoginGraceTime' directive?

Time allowed to complete authentication

Maximum idle session time

Interval for keep-alive messages

Duration to cache SSH keys

13. Which file contains the private SSH key for a user?

/home/user/.ssh/id_rsa

/home/user/.ssh/authorized_keys

/etc/ssh/ssh_host_rsa_key

/home/user/.ssh/known_hosts

14. Which of these should be configured to harden SSH? (Select all that apply)

Change default SSH port

Enable key-based authentication

Disable unused authentication methods

Allow all users to connect

Submit

15. Which of the following are recommended SSH hardening practices? (Select all that apply)

Disable password authentication

Use SSH keys for authentication

Allow root login

Set PermitRootLogin to no

Submit

16. Which file stores the public SSH keys for a specific user on a Linux host?

/home/user/.ssh/authorized_keys

/home/user/.ssh/id_rsa

/home/user/.ssh/known_hosts

/etc/ssh/ssh_config

Submit

Linux Network Pro Hardening SSH Access on a Linux Host Quiz

1. What is the default SSH port number?

2.

What first name or nickname would you like us to use?

2. Disabling root login via SSH is a security best practice.

3. What does the 'PermitRootLogin' directive control in sshd_config?

4. Which SSH key type is considered more secure for modern systems?

5. Which directive limits the number of concurrent SSH sessions per user?

6. Changing the default SSH port reduces security threats.

7. Port forwarding via SSH can introduce security risks if not properly configured.

8. Which option prevents SSH login using empty passwords?

9. SSH keys should be protected with a passphrase.

10. Which SSH configuration directive disables password authentication and forces key-based login?

11. Which SSH protocol version should be used for modern security?

12. What is the purpose of the 'LoginGraceTime' directive?

13. Which file contains the private SSH key for a user?

14. Which of these should be configured to harden SSH? (Select all that apply)

15. Which of the following are recommended SSH hardening practices? (Select all that apply)

16. Which file stores the public SSH keys for a specific user on a Linux host?

17. The 'AllowUsers' directive in sshd_config specifies ____.

18. The 'ssh-keygen' command is used to ____.

19. The 'known_hosts' file stores ____.

20. The 'sshd_config' file is typically located at ____.