16. Which layer of the OSI model is responsible for routing data between networks?
a) Physical layer
b) Data Link layer
c) Network layer
d) Transport layer
17. Which protocol is used for secure web browsing?
a) HTTP
b) SMTP
c) FTP
d) HTTPS
18. What is a firewall?
a) A device that connects multiple networks
b) A device that protects a network from unauthorized access
c) A protocol used for remote access to a network
d) A type of network cable
19. Which network topology connects all devices to a central device?
a) Star topology
b) Bus topology
c) Ring topology
d) Mesh topology
20. What is the purpose of a proxy server?
a) To provide secure remote access to a network
b) To transfer files between computers over the internet
c) To cache web content for faster access
d) To convert domain names to IP addresses
