111-00-1275_QUIZ_1

111-00-1275_QUIZ_1 - N ame:Hemanth Naidu Student I...

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Name:Hemanth Naidu Student Id:111-00-1275 1)How do LANs differ from MANs, WANs, and BNs? A local area network (LAN) is a group of micro computers or terminals located in the same general area. A Backbone Network (BN) is a central network that connects most everything on a single company site. A Metropolitan Network is a (MAN) encompasses a city or country area. A Wide Area Network (WAN) spans cities, states, or national boundaries. 2) Clearly explain the differences between analog data, analog transmission, digital data, and digital transmission . Analog data: Data that is recorded in a form that is similar to its original structure. Contrast with digital data. Analog transmission: Transmission of a continuously variable signal as opposed to a discrete on/off signal. The traditional way of transmitting a telephone or voice signal is analog. Digital data: Data that consists, at its most basic level, of just0 and 1’s.Digital transmission is also called base band transmission and is done by sending a series of electrical (or light) pulse through the media. Digital transmission is preferred to
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analog transmission because it produces fewer errors and is more efficient. It permits higher maximum transmission rates and is more secure and simplifies the integration of voice, video, and data on the same circuit. 3) What is asynchronous transmission v. synchronous transmission? Describe one protocol of each type? PROTOCOLS: A protocol is a set of rules which governs how data is sent from one point to another. In data communications, there are widely accepted protocols for sending data. Both the sender and receiver must use the same protocol when communicating. One such rule isBy convention. the least significant bit is transmitted first. Asynchronous Transmission: The asynchronous protocol evolved early in the history of telecommunications. It became popular with the invention of the early teletypewriters that were used to send telegrams around the world. Asynchronous systems send data bytes between the sender and receiver by packaging the data in an envelope. This envelope helps transport the character across the transmission line that separates the sender and receiver. The transmitter creates the envelope, and the receiver uses the envelope to extract the data. Each character (data byte) the sender transmits is preceded with a start bit, and suffixed with a stop bit. These extra bits serve to synchronize the receiver with the sender. In asynchronous serial transmission, each character is packaged in an envelope, and sent across a single wire, bit by bit, to a receiver. Because no signal lines are used to convey clock (timing) information, this method groups data together into a sequence of bits (five - eight), then prefixes them with a start bit and appends the data with a stop bit. The purpose of the start and stop bits was introduced for the old electromechanical
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111-00-1275_QUIZ_1 - N ame:Hemanth Naidu Student I...

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