ELECT 4240 Communication Networks Summer Semester 1435/ /2015 CHAPTER 1

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ELECT 4240 Communication Networks Summer Semester 1435/1436--- 2014/2015 CHAPTER 1

1 ELECT 4240 Communication Networks Summer Semester 1435/ /2015 CHAPTER 1 Introduction: Key Terms, Multiple Choice Questions and Review Questions Prof. Alaa M. Elsayyad

2 Lecture Contents Overview for how networks operate, what types of technologies are available, and which design best fills which set of needs. This lecture is divided into five sections. The first section introduces data communications and defines their components and the types of data exchanged. It also shows how different types of data are represented and how data is flowed through the network. The second section introduces networks and defines their criteria and structures. It introduces four different network topologies that are encountered throughout the book. The third section discusses different types of networks: LANs, WANs, and internetworks (internets). It also introduces the Internet, the largest internet in the world. The concept of switching is also introduced in this section to show how small networks can be combined to create larger ones. The fourth section covers a brief history of the Internet. The section is divided into three eras: early history, the birth of the Internet, and the issues related to the Internet today. The fifth section covers standards and standards organizations. The section covers Internet standards and Internet administration. Key Terms Advanced Network Services Network (ANSNET) local area network (LAN) Advanced Research Projects Agency (ARPA) mesh topology message Advanced Research Projects Agency Network Military Network (MILNET) (ARPANET) American Standard Code for Information multipoint or multidrop connection Interchange (ASCII) National Science Foundation Network (NSFNET) audio network backbone node Basic Latin packet bus topology packet-switched network circuit-switched network performance code physical topology Computer Science Network (CSNET) point-to-point connection data protocol data communications Request for Comment (RFC) delay RGB full-duplex mode ring topology half-duplex mode simplex mode hub star topology image switched network internet TCP/IP protocol suite Internet telecommunication Internet Architecture Board (IAB) throughput Internet draft Transmission Control Protocol/ Internet Internet Engineering Task Force (IETF) Protocol (TCP/IP) Internet Research Task Force (IRTF) transmission medium Lecture 1: Introduction Key Terms, MCQs and Review Questions 2 P a g e

3 Internet Service Provider (ISP) Internet Society (ISOC) Internet standard internetwork Unicode video wide area network (WAN) YCM Lecture 5: Multiple Choice Questions 1 The is the physical path over which a message travels. A) Protocol B) Medium C) Signal D) All the above 2 The information to be communicated in a data communications system is the. A) Medium B) Protocol C) Message D) Transmission 3 Frequency of failure and network recovery time after a failure are measures of the of a network. A) Performance B) Reliability C) Security D) Feasibility 4 An unauthorized user is a network issue. A) Performance B) Reliability C) Security D) All the above 5 Which topology requires a central controller or hub? A) Mesh B) Star C) Bus D) Ring 6 Which topology requires a multipoint connection? A) Mesh B) Star C) Bus D) Ring Lecture 1: Introduction Key Terms, MCQs and Review Questions 3 P a g e

4 7 Communication between a computer and a keyboard involves transmission. D) automatic 8 A television broadcast is an example of transmission. D) automatic 9 A connection provides a dedicated link between two devices. A) point-to-point B) multipoint C) primary D) secondary 10 In a connection, more than two devices can share a single link. A) point-to-point B) multipoint C) primary D) secondary 11 In transmission, the channel capacity is shared by both communicating devices at all times. D) half-simplex 12 is the protocol suite for the current Internet. A) TCP/IP B) NCP C) UNIX D) ACM 13 refers to the structure or format of the data, meaning the order in which they are presented. A) Semantics B) Syntax C) Timing D) All of the above 14 defines how a particular pattern to be interpreted, and what action is to be taken based on that interpretation. A) Semantics B) Syntax Lecture 1: Introduction Key Terms, MCQs and Review Questions 4 P a g e

5 C) Timing D) None of the above 15 refers to two characteristics: when data should be sent and how fast it can be sent. A) Semantics B) Syntax C) Timing 16 Data flow between two devices can occur in a way. D) all of the above 17 In a connection, two and only two devices are connected by a dedicated link. A) multipoint B) point-to-point C) (a) and (b) 18 In a connection, three or more devices share a link. A) multipoint B) point-to-point C) (a) and (b) 19 refers to the physical or logical arrangement of a network. A) Data flow B) Mode of operation C) Topology D) None of the above 20 Devices may be arranged in a topology. A) mesh B) ring C) bus D) all of the above 21 A is a data communication system within a building, plant, or campus, or between nearby buildings. A) MAN B) LAN C) WAN 22 A is a data communication system spanning states, countries, or the whole world. A) MAN B) LAN Lecture 1: Introduction Key Terms, MCQs and Review Questions 5 P a g e

6 C) WAN 23 is a collection of many separate networks. A) A WAN B) An internet C) a LAN D) None of the above 24 There are Internet service providers. A) local B) regional C) national and international D) all of the above 25 A is a set of rules that governs data communication. A) forum B) protocol C) standard Review Questions 1. Identify the five components of a data communications system 2. What are the three criteria necessary for an effective and efficient network? 3. What are the advantages of a multipoint connection over a point-to-point connection? 4. What are the two types of line configuration? 5. Categorize the four basic topologies in terms of line configuration. 6. What is the difference between half-duplex and full-duplex transmission modes? 7. Name the four basic network topologies, and cite an advantage of each type. 8. For n devices in a network, what is the number of cable links required for a mesh,ring, bus, and star topology? 9. What is an internet? What is the Internet? 10. Why are protocols needed? Lecture 1: Introduction Key Terms, MCQs and Review Questions 6 P a g e

7 11. Why are standards needed? 12. Draw a hybrid topology with a star backbone and three ring networks. 13. Draw a hybrid topology with a ring backbone and two bus networks. Lecture 1: Introduction Key Terms, MCQs and Review Questions 7 P a g e

Transfer of data from one device to another via some form of transmission medium.

Transfer of data from one device to another via some form of transmission medium. Overview of Data Communication and Computer Networks Data Communications Asst. Prof. Mahdi Abbasi, Ph.D. abbasi@basu.ac.ir i Computer Engineering Department Bu-Ali Sina University 1 Outline Data Communication