Accounting Information System II Chapter 12 – Electronic Commerce Systems REVIEW QUESTIONS 1. What is a VPN? * A VPN (virtual private network) is a private network that exists within a public network. 2. Name the 3 types of addresses used on the internet. * The Internet uses three types of addresses for communications: * (1) email addresses‚ * (2) Web site (URL) addresses‚ and * (3) the addresses of individual computers attached to network (IP address). 3
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http://www.example.com/page2 http 10. The internet core comprises of Many separate networks‚ some small some large 11. What is designed to specifically manage computer peripheral devices Device driver 12. Why is the TCP/IP model divided into layers To make it easier to understand how networks work‚ write protocols for networks‚ and to create standards for networks 13. Why is the TCP/IP considered an "open" network model It is not owned by any specific organization and shares details of how
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three levels – Application level – Computer level – Communication channel Protocol – Set of rules for communications – OSI Standard 10-2 OSI Reference Model Layer 7 6 5 4 3 2 1 Name Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer Purpose Application-to-application communication Manage data representation conversions Establish and maintain communication channel Guarantee end-to-end integrity of
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Telnet) and e-mail. Once the Application level has been completed‚ control is passed to the sixth level‚ or Presentation level. What occurs at this level involves transforming the data into a form that the application layer can accept. Encrypted data is handled at this level. This layer formats and encrypts data to be sent across a network. Sometimes this level is known as the syntax level. Control is then passed
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Abstract In order to experiment with distinct components of a mixture‚ they must be first separated so they can be observed individually. This is accomplished in this lab by the technique called thin layer chromatography (TLC). TLC involves a stationary phase‚ which the TLC plates as well as a mobile phase‚ which could be one of two solvents used: ethanol-acetone for TLC. Dyes in a sample separate consequently because of their unique polarities. As a result‚ nonpolar substances travel further
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Experiment 9 Thin Layer Chromatography Experiment: 9 Title: Thin Layer Chromatography Introduction: Chemical analysis is conducted on specific analytes (specific substance of interest in a mixture)‚ however it is often found that these analytes must be separated for the chemical analysis to conduct their analysis. Chromatography is a set up of laboratory a technique that is used to separate a chemical mixture. This technique is very useful as it allows us to follow the course of
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References: Cloud Computing. (2012‚ Nov). Retrieved from http://www.cisco.com Principles of IT Seurity. (2012‚ Nov). Retrieved from http://www.blink‚ucsd.edu Secure Socket Layer. (2012‚ Nov). Retrieved from http://www.searchsecuritytechtarget.com Wallace‚ K. A. (2005‚ June). Internet Security Problems Can Be Prevented. Retrieved from http://www.ezinearticles.com
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objective of the lab is to separate the caffeine samples we are using‚ using thin layer chromatography. The solvent we are using for the separation is 3:1 mixture of Chloroform and Acetone. Principle: Thin layer chromatography (TLC) is an important technique that is useful for separating organic compounds. TLC is often used to monitor the progress of organic reactions and to check the purity of products. Separations in Thin layer chromatography involve distributing a mixture of two or more substances between
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This article has been accepted for inclusion in a future issue of this journal. Content is final as presented‚ with the exception of pagination. IEEE COMMUNICATIONS SURVEYS & TUTORIALS‚ ACCEPTED FOR PUBLICATION 1 Vehicular Networking: A Survey and Tutorial on Requirements‚ Architectures‚ Challenges‚ Standards and Solutions Georgios Karagiannis‚ Onur Altintas‚ Eylem Ekici‚ Geert Heijenk‚ Boangoat Jarupan‚ Kenneth Lin‚ and Timothy Weil Abstract—Vehicular networking has significant potential
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COLUMN AND THIN LAYER CHROMATOGRAPHY Maria Janine B. Abarientos‚ Kuia B. Allarde‚ Aliana Keshia P. Andino Mary Viadelle E. Andrada and Nina Marian Robelea G. Ang Group 1 2C Pharmacy Organic Chemistry Laboratory ABSTRACT In this experiment‚ the techniques column and thin layer chromatography was used to separate and determine the purity of the colored components of siling labuyo and malunggay leaves. The results obtained relied on differential solubilities and adsorptivities of the components to
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