Create a list of all the things you do in an average day that use data communications and computer networks.
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Answers will vary. Could include riding mass transit, driving on highway, hour banking withdrawal, work on homework on computer, and check your e-mail. If you could design your own home, what kinds of computer network or data communications labor-saving devices would you incorporate? Could include alarms, remote control of appliances, remote monitoring of windows and doors, indoor and outdoor video surveillance, motion sensors, and distributed video and music systems. Two companies consider pooling resources to perform a joint venture.
The CEO of the first company meets with his legal team, and the legal team consults a number of middle managers in the proposed product area. Meanwhile, the CEO of the first company sends an email to the CEO of the second company to offer a couple suggestions concerning the joint venture.
Does this scenario follow the OSI model? No, this does not follow the OSI model. Upper layers do not communicate directly. All physical communications proceed only through the lowest layer. List all the different network connections involved in this operation. You are working from home using a microcomputer, a DSL modem, and a telephone connection to the Internet. Your company is connected to the Internet and has both local area networks and a mainframe computer.
Possible answers might include: Microcomputer to Internet connection Local area network to wide area network 6. You are sitting at the local coffee shop, enjoying your favorite latte. You pullout your laptop and, using the wireless network available at the coffee shop, access your e-mail.
Microcomputer to local area network connection Local area network to wide area network or Microcomputer to Internet 7. With your new cell phone, you have just taken a snapshot of your best friend. You decide to send this snapshot to the e-mail account of a mutual friend across the country. Wireless telephone connection Wide area network to wide area network perhaps 8. You are driving in a new city and have just gotten lost.
Satellite connection Wide area network to wide area network perhaps 9. Are they really missing? Not exactly. The data link layer performs the error checking when the data arrives at the next computer on the transmission path.
Data Communications & Computer Networks: A Business User's Approach
The transport layer performs the error checking only when the data arrives at the final destination machine. Similarly, the data-link layer provides flow control, and the transport layer provides flow control. Are these different forms of flow control? Once again, the flow control provided by the data link layer is between two adjacent devices at the data link level, while flow control provided by the transport layer as only between the end- points of the connection at the transport level.
You are watching a television show and somebody is suing somebody else. The lawyers for both parties meet and try to work out a settlement. Is there a logical or physical connection between the lawyers? What about between the two parties? Physical between the lawyers but logical between the two parties. To perform the file transfer, your computer issues a Get File command.
Data Communications and Computer Networks : A Business User’s Approach – Sherwood books
Show the progression of messages as the Get File command moves from your computer, through routers, into the remote computer, and back. Answer should be very similar to Figure What characteristics distinguish a personal area network from other types of networks? Very short distance and wireless, essentially used for eliminating wires betweens electronic and peripheral devices. Many similarities, but a metropolitan area network is almost always fiber optic, very high speed, and very resilient to failures. List the OSI layer that performs each of the following functions: a.
You are sending and receiving instant messages IM with a friend. Is this IM session a logical connection or a physical connection? Explain your answer. This is a logical connection. The physical connection is a wire or airwave that is used to transmit the IM message as a signal.
Data Communications and Computer Networks: A Business User's Approach
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By Abdulkadir Madar. View all copies of this ISBN edition:. Synopsis About this title Data communications and computer networks are becoming increasingly more important--today's business world could not function without either. About the Author : Curt M. Buy New Learn more about this copy. Other Popular Editions of the Same Title. Search for all books with this author and title.
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