1. Which protocol operates at the application layer in the TCP/IP model?

2. How many layers are there in the TCP/IP protocol stack.

3. What is not a layer of the TCP/IP protocol stack.

4. What refers to a network layer packet (PDU).

5. What refers to a link layer packet (PDU).

6. Why are protocols important in networking?

7. What is the purpose of de-encapsulation?

8. How many layers does the ISO/OSI reference model have?

9. Which protocol ensures guaranteed delivery of application-layer messages?

10. What is a characteristic of the UDP protocol.

11. What does encapsulation in networking refer to?

12. What is a characteristic of the TCP protocol.