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