Objective 1 Identify and describe the functions of each of the seven layers of the OSI reference model.
Objective 2 Describe connection-oriented network service and connectionless network service, and identify the key differences between them.
Objective 4 Identify at least 3 reasons why the industry uses a layered model.
Objective 5 Define and explain the 5 converstion steps of data encapsulation.
Objective 7 List the key internetworking functions of the OSI Network layer and how they are performed in a router.
2. What is the main purpose of Layer 7?
3. What is the main purpose of Layer 6?
4. What is the main purpose of Layer 5?
5. What is the main purpose of Layer 4?
6. What is the main purpose of Layer 3?
7. What is the main purpose of Layer 2?
8. What is the main purpose of Layer 1?
9. Describe the process of data encapsulation as data is processed from creation until it exits a physical interface to a network. Use the OSI model as an example.
10. Describe the services provided in most connectionless protocol services.
11. Name at least three connectionless protocols.
12. Describe the services provided in most connection-oriented protocol services.
13. In a particular error recovering protocol, the sender sends three frames, labeled 2, 3, and 4. The receiver of these frames, on its next sent frame, sets an acknowledgment field to "4". What does this typically imply?
14. Name three connection-oriented protocols.
15. What does MAC stand for?
16. Name three terms popularly used as a synonym for MAC Address.
17. Are IP addresses defined by a Layer 2 or Layer 3 protocol?
18. Are IPX addresses defined by a Layer 2 or Layer 3 protocols?
19. Are OSI NSAP addresses defined by a Layer 2 or a Layer 3 protocol?
20. What portion of a MAC address encodes an identifier representing the manufacturer of the card?
21. Are MAC addresses defined by a Layer 2 or a Layer 3 protocol?
22. Are DLCI addresses defined by a Layer 2 or a Layer 3 protocol?
23. Name two differences between Layer 3 addresses and Layer 2 addresses.
24. How many bits in an IP address?
25. How many bits in an IPX address?
26. How many bits in a MAC address?
27. How many bits in a DLCI address?
28. Name the two main parts of an IPX address. Which part identifies which "group" this address is a member of?
29. Name the two main parts of an IP address. Which part identifies which "group" this address is a member of?
30. Name the two main parts of a MAC address. Which part identifies which "group" this address is a member of?
31. Name three benefits to layering networking protocol specifications.
32. What header and/or trailer does a router discard as a side effect of routing?
33. Describe the differences between a routed protocol and a routing protocol.
34. Name at least three routed protocols.
35. Name at least three routing protocols.
36. How does an IP host know what router to send a packet to? In which cases does an IP host choose to send a packet to this router instead of directly to the destination host?
37. How does an IPX host know which router to send a packet to? In which case does an IPX host choose to send a packet to this router instead of directly to the destination host?
38. Name three items in an entry in any routing table.