<p> CISCO Semester 4 Chapter 2 Worksheet</p><p>Overview and Section 2.1 WAN Technology</p><p>1. What does WAN stand for? </p><p>2. What is a WAN? </p><p>3. How does a WAN differ from a LAN? </p><p>4. WAN technologies function at what three layers of the OSI model? </p><p>5. What is the WAN provider's central office (CO) used for? </p><p>6. What three categories can WAN provider services be broken down into? </p><p>7. One category of WAN provider services is call setup, what is it</p><p>8. What is another name for call setup? </p><p>9. One category of WAN provider services is Time-division multiplexing (TDM) what is it? </p><p>10. What are two things that TDM avoids? </p><p>11. Name two services that use TDM circuits. </p><p>Page 1 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 12. When selecting a WAN service provider what two things should you discuss before purchasing the service? </p><p>13. What is customer premises equipment (CPE) and who owns them? </p><p>14. What is demarcation and where does it usually occur? </p><p>15. What is the Local loop (or "last-mile")? </p><p>16. What is the CO switch? </p><p>17. What is a toll network? </p><p>18. What device is typically the data terminal equipment (DTE)? </p><p>19. What does the data circuit-terminating equipment (DCE) do? </p><p>20. List three DCE devices. </p><p>21. List the bit rate for T1= ______, E1= ______, and J1= </p><p>Section 2.2 WAN Devices</p><p>22. List four WAN devices. </p><p>Page 2 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 23. Which of the four WAN devices from the above question is also a LAN device? </p><p>24. Describe what a modem does in your own words. </p><p>25. Describe what a CSU/DSU does in your own words and where are they usually placed. </p><p>Section 2.3 How WANs relate to the OSI Model</p><p>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? </p><p>27. What do WAN data-link protocols describe? </p><p>28. List six data-link encapsulations associated with WAN lines. </p><p>29. What uses a simplified encapsulation with no error correction mechanisms over high-quality digital facilities? </p><p>30. What uses a set of digital services that transmits voice and data over existing phone lines? </p><p>Section 2.4 WAN Encapsulation Formats</p><p>31. What are the two most common point-to-point WAN encapsulations? </p><p>32. To ensure that the correct encapsulation protocol is used, you need to configure the Layer 2 encapsulation type for each what? </p><p>Page 3 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 33. What encapsulation method should you use with devices that are not running Cisco IOS software? </p><p>Section 2.5 WAN Link Options</p><p>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.</p><p>WAN</p><p>35. Leased lines provide full-time service and are also known as what? </p><p>36. What three things are required for a dedicated line connection to be made? </p><p>37. What is the most widely used dedicated line technology and what speed does it operate at? </p><p>38. Describe packet switching in your own words. </p><p>39. List three examples of packet-switched WAN technologies. </p><p>40. Which layer of the OSI model does Frame Relay operate at? </p><p>Page 4 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc 41. Describe circuit switching in your own words. </p><p>42. List an example of a circuit-switched WAN technology. </p><p>43. What are three primary uses of circuit switched connections? </p><p>44. What does DDR stand for? </p><p>45. What type of connection is established when using DDR? </p><p>46. What are two things DDR can be used for? </p><p>47. List two ISDN services available? </p><p>48. How much total bandwidth does ISDN BRI deliver? </p><p>49. What are the labels, bandwidths, and functions of the three channels available when using ISDN BRI? </p><p>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? </p><p>Page 5 of 5 0d55eabb6c64ff0e0dda520027cc172e.doc</p>