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Networks of computers and the Internet that connects them to each other form the basic technological structure that underlies virtually all electronic commerce. In its early years, the Internet was a military project that became a science project with funding from the National Science Foundation. In one or two paragraphs, describe its transition to an environment that allowed and supported commercial activity.
In the early s, the U. Department of Defense began examining ways to connect computers to each other and to weapons installations distributed all over the world. Employing many of the best communications technology researchers, the Defense Department funded research at leading universities and institutes. The goal of this research was to design a worldwide network that could remain operational, even if parts of the network were destroyed by enemy military action or sabotage.
E-mail was born in when Ray Tomlinson, a researcher who used the network, wrote a program that could send and receive messages over the network. This new method of communicating became widely used very quickly. As personal computers became more powerful, affordable, and available during the s, companies increasingly used them to construct their own internal networks. Although these networks included e-mail software that employees could use to send messages to each other, businesses wanted their employees to be able to communicate with people outside their corporate networks.
These connections allowed commercial enterprises to send e-mail directly to Internet addresses, and allowed members of the research and education communities on the Internet to send e-mail directly to MCI Mail and CompuServe addresses. The most common perception of the Internet is that it connects computers to one another and, by doing so, connects the users of those computers to each other.
In recent years, devices other than computers have been connected to the Internet, such as mobile phones and tablet devices. Once again, the connection of these devices to the Internet serves to connect the users of those devices to each other.
However, the connection of devices to the Internet that are not used by persons is increasing rapidly. These devices—such as switches, optical scanners, sensors that detect changes in temperature, light, moisture, or the existence of vibration or movement— can be connected to the Internet and used by computers to manage automatically environmental conditions such as heating and cooling or lighting levels or security procedures.
These interconnected devices can be located in houses, offices, factories, autos, appliances, and so on. Computers can also be connected to each other using the Internet to conduct business transactions without human intervention. The subset of the Internet that includes these computers and sensors connected to each other for communication and automatic transaction processing is often called the Internet of Things.
In a paragraph, explain why packet-switching is better than circuit-switching for the Internet. Although circuit switching works well for telephone calls, it does not work as well for sending data across a large WAN or an interconnected network like the Internet. The Internet was designed to be resistant to failure. In a circuit-switched network, a failure in any one of the connected circuits causes the connection to be interrupted and data to be lost.
Instead, the Internet uses packet switching to move data between two points. Briefly describe the functions performed by routers in an interconnected network. As an individual packet travels from one network to another, the computers through which the packet travels determine the most efficient route for getting the packet to its destination. The most efficient route changes from second to second, depending on how much traffic each computer on the Internet is handling at each moment.
Electronic Commerce, 11th Edition Solutions The computers that decide how best to forward each packet are called routing computers, router computers, routers, gateway computers because they act as the gateway from a LAN or WAN to the Internet , border routers, or edge routers. In about words, explain the differences between a closed or proprietary architecture and an open architecture.
In your answer, be sure to explain which is used for the Internet and why it is used. Following its inception in , this experimental network grew during the next few years and began using the Network Control Protocol NCP. In the early days of computing, each computer manufacturer created its own protocol, so computers made by different manufacturers could not be connected to each other.
This practice was called proprietary architecture or closed architecture. NCP was designed so it could be used by any computer manufacturer and was made available to any company that wanted it.
This open architecture philosophy that was developed for the evolving ARPANET, included the use of a common protocol for all computers connected to the Internet and four key rules for message handling: Independent networks should not require any internal changes to be connected to the network.
Packets that do not arrive at their destinations must be retransmitted from their source network. Router computers act as receive-and-forward devices; they do not retain information about the packets that they handle. No global control exists over the network. Briefly describe the main concerns a company might have if it is still using the Internet Protocol version 4 IPv4.
The worldwide growth in the number of mobile devices and the Internet of Things has consumed existing IPv4 addresses much faster than anyone had predicted and current estimates are that new IPv4 addresses will no longer be available as soon as For example, IMAP can instruct the e-mail server to send only selected e-mail messages to the client instead of all messages. Electronic Commerce, 11th Edition Solutions IMAP lets users create and manipulate e-mail folders also called mailboxes and individual e-mail messages while the messages are still on the e-mail server; that is, the user does not need to download e-mail before working with it.
IMAP lets users manipulate and store their e-mail on the e-mail server and access it from any computer, which is important to people who access their email from different computers at different times. In general, server computers use faster and thus, more expensive disk drives than desktop computers. In , Vannevar Bush, who was director of the U. Office of Scientific Research and Development, wrote an article in The Atlantic Monthly about ways that scientists could apply the skills they learned during World War II to peacetime activities.
In the s, Ted Nelson described a similar system in which text on one page links to text on other pages. Nelson called his page-linking system hypertext. Douglas Engelbart, who also invented the computer mouse, created the first experimental hypertext system on one of the large computers of the s. In , Nelson published Literary Machines, a book in which he outlined project Xanadu, a global system for online hypertext publishing and commerce.
European Laboratory for Particle Physics. Switches c. Routers b. Bridges d. Routing algorithms ANS: Routers and the telecommunications lines connecting them are collectively referred to as a.
Internet routers d. A n does not extend beyond the boundaries of a particular organization. Internet c.
A n is like a separate, covered commuter lane on a highway the Internet in which passengers are protected from being seen by the vehicles traveling in the other lanes. VPN c. IP wrapper d. A n is a connection that uses public networks and their protocols to send data in a way that protects the data as well as a private network would, but at a lower cost. A is a collection of rules for formatting, ordering, and error checking data sent across a network.
Routers c. Protocols b.
Adapters ANS: In networking applications, an 8-bit number is often called a n a. Network engineers have devised a number of stopgap techniques to stretch the supply of IP addresses. One of the most popular techniques is. A computer called a converts private IP addresses into normal IP address when it forwards packets from those computers to the Internet.
The numbering system uses 16 characters. IPv6 uses a a. SMTP c. MIME b. A newer e-mail protocol that performs the same basic functions as POP, but includes additional features, is known as. IMAP c.
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POPI b. SMTP d. POP c. IMAP b. SMTP b. MIME d.
The combination of the protocol name and the domain name is called the a. URT c. URL b.
URO d. Internet Explorer a. Mosaic d. CompuServe b. Netscape ANS: Domain names c. Octets b. URLs d. Piconets ANS: The early versions of let Web page designers create text-based electronic documents with headings, title bar titles, bullets, lines, and ordered lists. A network which uses a specific set of rules and connects networks all over the world to each other, is called the.
Internet PTS: The part of the Internet known as the is a subset of the computers on the Internet that are connected to one other in a specific way that makes them and their contents easily accessible to each other. A n subscribed to the list. In , a group of students and programmers at Duke University and the University of North Carolina started , which allows anyone who connects to the network to read and post articles on a variety of subjects.
Usenet survives on the Internet today, with more than different topic areas that are called. Network access PTS: Programs apply their routing algorithms to information they have stored in routing tables or tables. The Protocol controls the disassembly of a message or a file into packets before it is transmitted over the Internet, and it controls the reassembly of those packets into their original formats when they reach their destinations.
The Protocol specifies the addressing details for each packet, labeling each with the packet's origination and destination addresses. The set of rules for delivering Web page files over the Internet is in a protocol called the. In HTML, the text elements that are related to each another are called elements. A n hyperlink structure resembles conventional paper documents in that the reader begins on the first page and clicks a Next button to move to the next page in a serial fashion.
As an individual packet travels from one network to another, the computers through which the packet travels determine the best route for getting the packet to its destination. Describe this process. The computers that decide how to best forward each packet are called routing computers, router computers, routers, gateway computers because they act as the gateway from a LAN or WAN to the Internet or border routers because they are located at the border between the organization and the Internet.
The programs on the routers that determine the best path contain rules called routing algorithms.
The programs apply these algorithms to information they have stored in routing tables or configuration tables. This information includes lists of connections that lead to particular groups of other routers, rules that specify which connection to use first, and rules for handling instances of heavy packet traffic and network congestion.You can change your ad preferences anytime. It sells its presses, grinders, and milling equipment using a few inside salespeople and telephones. XML uses markup tags to describe the meaning or semantics of the text.
The younger Indians prefer to spend most of their time browsing the Internet on their smartphones with little time spent for SMS. Responses might include the following advantages and disadvantages: Frieda has read about XML and thinks that it might help the DOT send orders to its many suppliers throughout the country more efficiently.
Designed by ICANN to help registrars who made errors in their domain names, the grace period refund was quickly abused by Web sites that populated their domains with lots of ad links that redirected visitors to other sites.
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