CISCO Semester 4 Chapter 2 Worksheet

Overview and Section 2.1 WAN Technology

1. What does WAN stand for?

2. What is a WAN?

3. How does a WAN differ from a LAN?

4. WAN technologies function at what three layers of the OSI model?

5. What is the WAN provider's central office (CO) used for?

6. What three categories can WAN provider services be broken down into?

7. One category of WAN provider services is call setup, what is it

8. What is another name for call setup?

9. One category of WAN provider services is Time-division multiplexing (TDM) what is it?

10. What are two things that TDM avoids?

11. Name two services that use TDM circuits.

Page 1 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 12. When selecting a WAN service provider what two things should you discuss before purchasing the service?

13. What is customer premises equipment (CPE) and who owns them?

14. What is demarcation and where does it usually occur?

15. What is the Local loop (or "last-mile")?

16. What is the CO switch?

17. What is a toll network?

18. What device is typically the data terminal equipment (DTE)?

19. What does the data circuit-terminating equipment (DCE) do?

20. List three DCE devices.

21. List the bit rate for T1= ______, E1= ______, and J1=

Section 2.2 WAN Devices

22. List four WAN devices.

Page 2 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 23. Which of the four WAN devices from the above question is also a LAN device?

24. Describe what a modem does in your own words.

25. Describe what a CSU/DSU does in your own words and where are they usually placed.

Section 2.3 How WANs relate to the OSI Model

26. What do the following represent EIA/TIA-232, EIA/TIA-449, EIA/TIA-612/613, V.24, V.35, X.21, G.703, EIA-530?

27. What do WAN data-link protocols describe?

28. List six data-link encapsulations associated with WAN lines.

29. What uses a simplified encapsulation with no error correction mechanisms over high-quality digital facilities?

30. What uses a set of digital services that transmits voice and data over existing phone lines?

Section 2.4 WAN Encapsulation Formats

31. What are the two most common point-to-point WAN encapsulations?

32. To ensure that the correct encapsulation protocol is used, you need to configure the Layer 2 encapsulation type for each what?

Page 3 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 33. What encapsulation method should you use with devices that are not running Cisco IOS software?

Section 2.5 WAN Link Options

34. Fill in the following figure that shows what two types of WAN link options are available, this is important and would probably help to memorize it.

WAN

35. Leased lines provide full-time service and are also known as what?

36. What three things are required for a dedicated line connection to be made?

37. What is the most widely used dedicated line technology and what speed does it operate at?

38. Describe packet switching in your own words.

39. List three examples of packet-switched WAN technologies.

40. Which layer of the OSI model does Frame Relay operate at?

Page 4 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 41. Describe circuit switching in your own words.

42. List an example of a circuit-switched WAN technology.

43. What are three primary uses of circuit switched connections?

44. What does DDR stand for?

45. What type of connection is established when using DDR?

46. What are two things DDR can be used for?

47. List two ISDN services available?

48. How much total bandwidth does ISDN BRI deliver?

49. What are the labels, bandwidths, and functions of the three channels available when using ISDN BRI?

50. Did you do all of the following: comprehend the summary, go over the chapter outline one last time and take the chapter quiz all given in the curriculum?

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