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  1. 1. Which of the following best describes the main function of OSI Layer 1 protocols?
  2. a. Framing
  3. b. Delivery of bits from one device to another
  4. c. Addressing
  5. d. Local Management Interface (LMI)
  6. e. DLCI
  7. Table 4-1 “Do I Know This Already?” Foundation Topics Section-to-Question Mapping
  8. Foundation Topics Section Questions
  9. OSI Layer 1 for Point-to-Point WANs 1–4
  10. OSI Layer 2 for Point-to-Point WANs 5, 6
  11. Frame Relay and Packet-Switching Services 7, 8
  12. 78 Chapter 4: Fundamentals of WANs
  13. 2. Which of the following typically connects to a four-wire line provided by a telco?
  14. a. Router serial interface without internal CSU/DSU
  15. b. CSU/DSU
  16. c. Router serial interface with internal transceiver
  17. d. Switch serial interface
  18. 3. Which of the following typically connects to a V.35 or RS-232 end of a cable when
  19. cabling a leased line?
  20. a. Router serial interface without internal CSU/DSU
  21. b. CSU/DSU
  22. c. Router serial interface with internal transceiver
  23. d. Switch serial interface
  24. 4. On a point-to-point WAN link using a leased line between two routers located
  25. hundreds of miles apart, what devices are considered to be the DTE devices?
  26. a. Routers
  27. b. CSU/DSU
  28. c. The central office equipment
  29. d. A chip on the processor of each router
  30. e. None of these answers are correct.
  31. 5. Which of the following functions of OSI Layer 2 is specified by the protocol standard
  32. for PPP, but is implemented with a Cisco proprietary header field for HDLC?
  33. a. Framing
  34. b. Arbitration
  35. c. Addressing
  36. d. Error detection
  37. e. Identifying the type of protocol that is inside the frame
  38. “Do I Know This Already?” Quiz 79
  39. 6. Imagine that Router1 has three point-to-point serial links, one link each to three remote
  40. routers. Which of the following is true about the required HDLC addressing at
  41. Router1?
  42. a. Router1 must use HDLC addresses 1, 2, and 3.
  43. b. Router1 must use any three unique addresses between 1 and 1023.
  44. c. Router1 must use any three unique addresses between 16 and 1000.
  45. d. Router1 must use three sequential unique addresses between 1 and 1023.
  46. e. None of these answers are correct.
  47. 7. What is the name of the Frame Relay field used to identify Frame Relay virtual
  48. circuits?
  49. a. Data-link connection identifier
  50. b. Data-link circuit identifier
  51. c. Data-link connection indicator
  52. d. Data-link circuit indicator
  53. e. None of these answers are correct.
  54. 8. Which of the following is true about Frame Relay virtual circuits (VCs)?
  55. a. Each VC requires a separate access link.
  56. b. Multiple VCs can share the same access link.
  57. c. All VCs sharing the same access link must connect to the same router on the
  58. other side of the VC.
  59. d. All VCs on the same access link must use the same DLCI.
  60.  
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