CCENT/CCNA ICND1 Official Exam Certification Guide - Appendixes

trong mô hình. Các lớp cao hơn yêu cầu dịch vụ từ các lớp thấp hơn, và lớp dưới cung cấp các dịch vụ lớp cao hơn. B. cùng lớp tương tác xảy ra trên nhiều máy tính. Các chức năng được định nghĩa bởi lớp đó thường cần phải được thực hiện bằng nhiều máy tính, ví dụ, người gửi thiết lập một số thứ tự cho một phân đoạn, và người nhận nhận được thừa nhận của phân khúc đó. Một lớp duy nhất xác định quá trình đó, nhưng việc thực hiện các lớp trên nhiều thiết...
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CCENT/CCNA ICND1 Official Exam Certification Guide - Appendixes CCENT/CCNA ICND1 Official Exam Certification Guide - Appendixes 1828xbook.fm Page 575 Thursday, July 26, 2007 3:10 PM Part VI: Appendixes Appendix A Answers to the “Do I Know This Already?” Quizzes Appendix B Decimal to Binary Conversion Table Appendix C ICND1 Exam Updates: Version 1.0 Glossary 1828xbook.fm Page 576 Thursday, July 26, 2007 3:10 PM 1828xbook.fm Page 577 Thursday, July 26, 2007 3:10 PM A APPENDIX Answers to the “Do I Know This Already?” Quizzes Chapter 2 “Do I Know This Already?” D and F 1. A and G 2. B. Adjacent-layer interaction occurs on one computer, with two adjacent layers in the 3. model. The higher layer requests services from the next lower layer, and the lower layer provides the services to the next higher layer. B. Same-layer interaction occurs on multiple computers. The functions defined by 4. that layer typically need to be accomplished by multiple computers—for example, the sender setting a sequence number for a segment, and the receiver acknowledging receipt of that segment. A single layer defines that process, but the implementation of that layer on multiple devices is required to accomplish the function. A. Encapsulation is defined as the process of adding a header in front of data supplied 5. by a higher layer (and possibly adding a trailer as well). D 6. C 7. A 8. F 9. C and E. OSI includes the transport layer (not transmission layer) and the network 10. layer (not Internet layer). 1828xbook.fm Page 578 Thursday, July 26, 2007 3:10 PM 578 Appendix A: Answers to the “Do I Know This Already?” Quizzes Chapter 3 “Do I Know This Already?” D 1. A 2. B 3. B, D, and E. Routers, wireless access point Ethernet ports, and PC NICs all send using 4. pins 1 and 2, whereas hubs and switches send using pins 3 and 6. Straight-through cables are used when connecting devices that use the opposite pairs of pins to transmit data. B 5. A 6. A and C 7. C and D 8. A 9. B, C, and E 10. C 11. Chapter 4 “Do I Know This Already?” B 1. B 2. B 3. A 4. E 5. E. Although HDLC has an Address field, its value is immaterial on a point-to-point 6. link, as there is only one intended recipient, the device on the other end of the circuit. A 7. B. One of the main advantages of Frame Relay is that a router can use a single access 8. link to support multiple VCs, with each VC allowing the router to send data to a different remote router. To identify each VC, the router must use a different DLCI, because the DLCI identifies the VC. 1828xbook.fm Page 579 Thursday, July 26, 2007 3:10 PM Chapter 6 579 Chapter 5 “Do I Know This Already?” A and C. The network layer defines logical addressing, in contrast to physical 1. addressing. The logical address structure allows for easy grouping of addresses, which makes routing more efficient. Path selection refers to the process of choosing the best routes to use in the network. Physical addressing and arbitration typically are data link layer functions, and error recovery typically is a transport layer function. C and E 2. A 3. B. 224.1.1.1 is a class D address. 223.223.223.255 is the network broadcast address 4. for class C network 223 ...