Section: A+ Essentials

11) What is true about a firewall? (Choose three.)

1. Block a hacker from accessing the network.
   
2. Restrict a user from accessing an unauthorized site.
   
3. Expose the identities of the user and the network.
   
4. Provide an alarm for unauthorized access attempts.
   
5. A firewall can only be implemented in hardware.
   
6. A firewall can only be implemented in software.