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Questions--Chapter 1 Internetworking


1. Which is true when a broadcast is sent out in an Ethernet 802.3 LAN? A. The broadcast is sent only to the default gateway. B. The broadcast is sent only to the destination hardware address in the broadcast. C. The broadcast is sent to all devices in the collision domain. D. The broadcast is sent to all devices in the broadcast domain. 2. PDUs at the Network layer of the OSI are called what? A. Transport B. Frames C. Packets D. Segments 3. Which two statements about a reliable connection-oriented data transfer are true? A. Receiving hosts acknowledge receipt of data. B. When buffers are full, packets are discarded and are not retransmitted. C. Windowing is used to provide flow control and unacknowledged data segments. D. If the transmitting host’s timer expires before receipt of an acknowledgment, the transmitting host drops the virtual circuit. 4. PDUs at the Data Link layer are named what? A. Transport B. Frames C. Packets D. Segments 5. Segmentation of a data stream happens at which layer of the OSI model? A. Physical B. Data Link C. Network D. Transport 6. What term is used if you are using the processes of placing frames from one network system into the frame of another network system? A. Framing B. Encapsulating C. Tunneling D. Frame Relay 7. What does the Data Link layer use to find hosts on a local network? A. Logical network addresses B. Port numbers C. Hardware addresses D. Default gateways 8. What were the key reasons the ISO released the OSI model? (Choose two.) A. To allow companies to charge more for their equipment B. To help vendors create interoperable network devices C. To help vendors create and sell specialized software and hardware D. So the IBM mainframe would be replaced with the PC E. So the industry could create a standard for how host computers work F. So that different vendor networks could work with each other

9. Which statement about Ethernet networks is true? A. Full duplex can run over 10Base2. B. Full duplex requires a point-to-point connection when only two nodes are present. C. Full-duplex Ethernet can be used to connect multiple hosts to a single switch interface. D. Half duplex uses the cut-through LAN switch method. 10. What is used at the Transport layer to stop a receiving host’s buffer from overflowing? A. Segmentation B. Packets C. Acknowledgments D. Flow control E. PDUs 11. Which layer of the OSI provides translation of data? A. Application B. Presentation C. Session D. Transport E. Data Link 12. When data is encapsulated, which is the correct order? A. Data, frame, packet, segment, bit B. Segment, data, packet, frame, bit C. Data, segment, packet, frame, bit D. Data, segment, frame, packet, bit 13. Which of the following is not an advantage of a layered model? A. Allows multiple-vendor development through standardization of network components B. Allows various types of network hardware and software to communicate C. Allows changes to occur in all layers without having to change just one layer D. Prevents changes in one layer from affecting other layers, so it does not hamper development 14. What are two purposes for segmentation with a bridge? A. Add more broadcast domains. B. Create more collision domains. C. Add more bandwidth for users. D. Allow more broadcasts for users. 15. What does the term “Base” indicate in 100Base-TX? A. The maximum distance B. The type of wiring used C. A LAN switch method using half duplex D. A signaling method for communication on the network 16. What is the maximum distance of 100BaseT? A. 100 feet B. 1000 feet C. 100 meters D. 1000 meters

17. Which of the following would describe a Transport layer connection that would ensure reliable delivery? A. Routing B. Acknowledgments C. Switching D. System authentication 18. What are two reasons to segment a network with a bridge? A. Increase the amount of collision on a segment. B. Decrease the amount of broadcast on a segment. C. Reduce collisions within a broadcast domain. D. Increase the number of collision domains. 19. Which of the following types of connections can use full duplex? Select all that apply. A. Hub to hub B. Switch to switch C. Host to host D. Switch to hub E. Switch to host 20. Which of the following describes the Physical layer connection between a DTE (router) and a DCE (CSU/DSU) device? A. IP, IPX, AFP B. TCP, UDP C. EIA/TIA 232, V.35, X.21, HSSI D. FTP, TFPT, SMTP 21. Which of the following would be used to connect a router to an Ethernet switch? A. A B. B C. C D. None of the figures

22. Which of the following are Presentation layer protocols? Select all that apply. A. TFTP B. IP C. RTF D. QuickTime E. MIDI 23. Which of the following are considered some reasons for LAN congestion? Select all that apply. A. Bill Gates B. Low bandwidth C. Too many users in a broadcast domain D. Broadcast storms E. Routers F. Multicasting G. Any Cisco competitor 24. Which of the following are reasons for breaking up a network into two segments with a router? (Choose two.) A. To create fewer broadcast domains B. To create more broadcast domains C. To create one large broadcast domain D. To stop one segment’s broadcasts from being sent to the second segment 25. How do you connect to a router using HyperTerminal? A. Connect the Ethernet port of your host to the Ethernet interface of the router using a rolled cable. B. Connect the COM port of your host to the Ethernet port of your router using a straight-through cable. C. Connect the Ethernet port of your host to the console port of the router using a rolled cable. D. Connect the COM port of your host to the console port of the router using a crossover cable. E. Connect the COM port of your host to the console port of the router using a rolled cable.

Answers to Review Questions 1. D. A broadcast sent on an Ethernet 802.3 LAN will go to all devices in the Ethernet broadcast domain. 2. C. Protocol Data Units are used to define data at each layer of the OSI model. PDUs at the Network layer are called packets. 3. A, C. When a virtual circuit is created, windowing is used for flow control and acknowledgment of data. 4. B. Data is encapsulated with a media access method at the Data Link layer, and the Protocol Data Unit (PDU) is called a frame. 5. D. The Transport layer receives large data streams from the upper layers and breaks

these up into smaller pieces called segments. 6. C. If you place a frame inside another frame, this is called tunneling. 7. C. MAC addresses, also called hardware addresses, are used to uniquely identify hosts on a local network. 8. B, F. The ISO wanted all vendors equipment to be able to work together, which is the main reason for the OSI model. The second and last options are saying the same thing. 9. B. The best answer for this question is the second option. Full duplex cannot run over 10Base2; you cannot connect multiple nodes to a single switch port and run full duplex; and cut-through has nothing to do with half- or even full-duplex Ethernet. 10. D. Flow control stops a device from overflowing its buffers. Even though flow control can be used at many layers, the Transport layer’s reliable connection provides the best flow control available in the model. 11. B. The only layer of the OSI model that can actually change data is the Presentation layer. 12. C. The encapsulation method is: data, segment, packet, frame, bit. 13. C. The largest advantage of a layered model is that it can allow application developers to change the aspects of a program in just one layer of the layer model’s specifications. 14. B, C. Bridges break up collision domains, which allow more bandwidth for users. 15. D. Baseband signaling is a technique that uses the entire bandwidth of a wire when transmitting. Broadband wiring uses many signals at the same time on a wire. These are both considered an Ethernet signaling type. 16. C. 10BaseT and 100BaseT have a distance limitation of 100 meters. 17. B. A reliable Transport layer connection uses acknowledgments to make sure all data is transmitted and received reliably. 18. C, D. Bridges increase the number of collision domains in a network, which provides more bandwidth per user, which means less collision on a LAN. 19. B, C, E. Hubs cannot run full-duplex Ethernet. Full duplex must be used on a point-to-point connection between two devices capable of running full duplex. Switches and hosts can run full duplex between each other, no problem. 20. C. The EIA/TIA 232, V.35, X.21, and HSSI are examples of Physical layer specifications. 21. C. A straight-through Ethernet cable is used to connect a host or router to an Ethernet switch. 22. C, D, E. The Presentation layer defines many protocols; RTF, Quick-Time, and MIDI are correct answers. IP is a Network layer protocol; TFTP is an Application layer protocol. 23. B, C, D, F. Although, Bill Gates is a good answer for me, and Cisco probably would like the last option, the answers are: not enough bandwidth, broadcast storms, too many users, and multicasting. 24. B, D. Routers, by default, break up broadcast domains, which means that broadcasts sent on one network would not be forwarded to another network by the router. 25. E. From a COM port of a PC or other host, connect a rolled cable to the console port of the router, start HyperTerminal, set the BPS to 9600 and flow control to None, then press Enter to connect.


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