21. Which protocol is used for remote access to a network?
a) HTTP
b) Telnet
c) SSH
d) FTP
22. What is a switch?
a) A device that connects multiple networks
b) A device that protects a network from unauthorized access
c) A device that connects computers to the internet
d) A device that connects multiple devices in a LAN
23. What is a subnet?
a) A group of interconnected networks
b) A portion of a network
c) A type of network cable
d) A protocol used for remote access to a network
24. Which layer of the OSI model is responsible for ensuring that data is delivered to the correct application?
a) Physical layer
b) Data Link layer
c) Transport layer
d) Application layer
25. What is a gateway?
a) A device that connects two LANs
b) A device that connects two WANs
c) A device that connects a LAN to a WAN
d) A device that connects a computer to a LAN
