Which organization coordinates the assignment of Internet domain nam.pdf

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Which organization coordinates the assignment of Internet domain names, IP addresses, protocol parameters, and port numbers? A. The FCC B. The IEEE C. The IETF D. The ICANN Solution Answer D is the correct answer. The Internet Corporation for Assigned Names and Numbers (ICANN) is a technical coordination body for the Internet. ICANN coordinates the assignment of Internet domain names, IP addresses, protocol parameters, and port numbers. The FCC (Federal Communications Commission) is a regulatory agency of the U.S. government, so answer A is incorrect. The IEEE is another standards body that develops standards for computer networking and many other telecommunications areas, so answer B is incorrect. The Internet Engineering Task Force (IETF) is a large, open international community of network engineers, researchers, and vendors that provide technical guidance for the Internet community, so answer C is also incorrect..

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In aqueous solution, Cd2+will precipitate out of solution in the form of CdS in the presence of hydrogen sulfide (H2S). The Ksp of CdS = 1.0 x 10-28 and Ksp of H2S = 1.0 x 10-26 for the reaction: H2S (aq) = 2 H+(aq) + S2-(aq) a. Write the balanced net ionic equation for the reaction of cadmium ion with hydrogen sulfide to form cadmium sulfide solid. b. Write the equilibrium expression for the equation in part a. c. Calculate Koverall for the reaction in part a. d. Calculate the [Cd2+] in a solution saturated with H2S (0.10 M) at a pH = 2.00 ([H+] = 0.010 M). Solution a) The balanced ionic equation for the formation of cadmium sulfide from cadmium ion and hydrogen sulfide is given as Cd2+ (aq) + H2S (aq) <=======> CdS (s) + 2 H+ (aq) ……..(1) b) The equilibrium constant for the reaction is given as Koverall = [H+]2/[Cd2+][H2S] (ans) Note that the concentration of a solid is not written in the expression for the equilibrium constant. c) Write down the two ionization reactions as below. CdS (s) <=======> Cd2+ (aq) + S2- (aq) ……..(2) Ksp = [Cd2+][S2-] H2S (aq) <=======> 2 H+ (aq) + S2- (aq) …….(3) Ka = [H+]2[S2-]/[H2S] Subtract (2) from (3) and obtain Cd2+ (aq) + H2S (aq) <======> CdS (s) + 2 H+ (aq) Koverall = [H+]2/[Cd2+][H2S] = ([H+]2/[H2S])*(1/[Cd2+]) = ([H+]2[S2-]/[H2S])*1/([Cd2+][S2-] = Ka*1/Ksp = (1.0*10-26)*1/(1.0*10-28) = 100 (ans). d) We have [H2S] = 0.10 M and pH = 2.00. We define pH as pH = -log [H+] ====> 2.00 = -log [H+] ====> [H+] = antilog (-2.00) = 0.01 M Since Ka (H2S) is extremely small, we may assume the equilibrium concentration of H2S to be equal to 0.10 M; hence, we have Koverall = [H+]2/[Cd2+][H2S] ====> 100 = (0.01)2/[Cd2+].(0.10) ====> [Cd2+] = (0.01)2/(100*0.10) = 1.0*10-5 The concentration of Cd2+ at equilibrium is 1.0*10-5 M (ans)..

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101 CHAPTER 4 Networks, Collaborative Technology, and the Internet of Things C H A P T E R O U T L I N E Case 4.1 Opening Case: Sony Builds an IPv6 Network to Fortify Competitive Edge 4.1 Network Fundamentals 4.2 Internet Protocols (IP), APIs, and Network Capabilities 4.3 Mobile Networks 4.4 Collaborative Technologies and the Internet of Things (IoT) Case 4.2 Business Case: Google Maps API for Business Case 4.3 Video Case: Small Island Telecom Company Goes Global L E A R N I N G O B J E C T I V E S 4.1 Describe the different types of networks and the basic functions of business networks. 4.2 Understand the purpose of IPs and APIs and compare wireless 3G, 4G, and 5G networks and how they support businesses. 4.3 Describe the growth in mobile data traffic and understand the components of the mobile infrastructure including near-field communication. List the business functions that near-field communication supports. 4.4 Evaluate performance improvements gained from collaborative technology and understand concept of the Internet of Things (IoT) 102 C H A P T E R 4 Networks, Collaborative Technology, and the Internet of Things Introduction Across all types and sizes of organizations, the Internet and networks have changed the way that business is conducted. Twenty years ago, computers were glorified typewriters that could not communicate with one another. If we wanted to communicate we used the telephone. Today computers constantly exchange data with each other over distance and time to provide companies with a number of significant advantages. The convergence of access technologies, cloud, 5G networks, multitasking mobile operating systems, and collaboration platforms con- tinues to change the nature of work, the way we do business, how machines interact, and other things not yet imagined. In this chapter you will learn about the different types of networks, how they affect the way that businesses communicate with customers, vendors, and other businesses, and how the largest network, the Internet, is enabling massive automatic data collection efforts from “things” rather than from people. Case 4.1 Opening Case G ra sk o/ S hu tte rs to ck R ob A rn ol d /A la m y S to ck P ho to Ja m es B re y/ G et ty Im ag es Sony Builds an IPv6 Network to Fortify Competitive Edge Sony’s Rapid Business Growth In the early 2000s, Sony Corporation had been engaged in strate- gic mergers and acquisitions to strengthen itself against intensifying competition (Figure 4.1). By 2007 Sony’s enterprise network (internal network) had become too complex and was incapable of supporting communication, operations, and further business growth (Table 4.1). The enterprise network was based on IPv4. A serious limitation was that the IPv4 network could not provide real-time collaboration among business units and group companies. Expansion efforts were taking too long because of the compl ...

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