Data Communications Networking Devices - 4th Ed.pdf

REVIEW QUESTIONS _____________________________________________________________ 1671.13.1 Discuss the importance of having standards.1.13.2 Discuss the difference between national,international,and de facto standards. Citean example of each.1.13.3 Why would it be in the best interest of a manufacturer to build a product compatiblewith appropriate standards,such as the RS-232/V.24 standard?1.13.4 Discuss the applicability of FIPS and ANSI standards with respect to federalagencies and private sector ®rms.1.13.5 Why can it take up to four years or more for the ITU to adopt a recommendation?1.13.6 Name two sources of de facto communications standards.1.13.7 What is a Request For Comment RFC)?1.13.8 What is the purpose of layer isolation in the OSI reference model?1.13.9 What are the functions of nodes and paths in a network?1.13.10 Discuss the seven OSI layers and the functions performed by each layer.1.14.1 What is the primary difference between RS-232-C and RS-232-D with respect tointerchange circuits and connectors?1.14.2 What is the difference in connector requirements between RS-232,ITU V.24,V.35and X.20 standards?1.14.3 Discuss the relationship between the voltage to represent a binary one in a terminaland the RS-232 signal characteristics that represent a binary one.1.14.4 What are three methods commonly used to refer to RS-232 circuits? Which methoddo you feel is most popular in industry? Why?1.14.5 What is the purpose of the ring indicator signal? Why do some modems require tworings prior to answering a call?1.14.6 What is the difference between internal and external timing?1.14.7 What are two key limitations associated with RS-232? Describe how differentialsignaling associated with RS-449 and RS-530 alleviate a considerable portion of thoselimitations.1.14.8 What is balanced signaling?1.14.9 What is the primary application for using a V.35 interface?1.14.10 What is the purpose of the RS-366-A interface?1.14.11 Why is the X.21 interface more costly than an RS-232/V.24 interface?