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Network Communication

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Network Communication Important pages to refer … Page wise Page 1 to 4 - Explain Bandwidth, Data Terminal Equipment & Data Circuit terminating equipment Page 4 to 5 - . Amplitude Modulation Vs Frequency Modulation Page 9 to 9 - Wired and wireless Page 10 to 12 – ATM Page 12 to 15 – VSAT Page 15 to 19 – OSI model and difference btw OSI and TCP Page 20 to 31 - Network and Network architecture Page 32 to 33 – Synchronization Page 33 to 34 – Error and Detection Page 41 to 42 – Network Protocols Page 49 to 52 – Network Interface card Page 52 to 54 - protocols – LAN and WAN Page 57 – Protocols – LAN and WAN Page 61 to 63 – CSMA Page 63 to 64 – Address resolution Page 71 to 77 - Client server and Net centric and web centric Page 82 to 84 – Packet and circuit switching Page 84 to 86 – Frame relay Page 118 to 119 – Analog vs Digital Signal Page 123 to 124 – DHCP Page 127 to 128 – VOIP Page 131 – DNS Question Bank with Solution – Networking - by MJ 1. Effective communication between two devices for data (Text including numbers, Images, Audio or Voice, Video) communication are (a)Delivery, (b)Accuracy and (c)Timeliness. Explain this statement with suitable example. ----------------------------------------------------------------------------------------------------------------- 2. Explain the difference between Analog and Digital signals with respect to any five parameters such as signal, wave patterns, technology, transmission, bandwidth, memory, power, impedance, etc. Ans – Refer to Page 118 -------------------------------------------------------------------------------------------------------------------------- 3. What is a network interface card and how is it different from wireless network interface cards? Identify at least five suitable applications of these cards in real time environment. Ans – Q.16 – Page 51 -------------------------------------------------------------------------------------------------------------------- 4. What is network? Explain component of a Computer network in a company. Ans – Page 54 -------------------------------------------------------------------------------------------------------------------- 5. Define the basic component of Data Communication? Differentiate Between Analog and Digital Communication. Ans : http://greatinformer.blogspot.in/2012/11/what-is-data-communication-components.html for data communication http://datacombd.blogspot.in/2011/05/what-is-data-communication-what-are.html - One can check this The primary difference between analog and digital communication is the difference in the concept behind "continuous time" and "discrete time". Continuous time signals have a value at every point in time, no matter how thin you slice between two time points. Discrete time is based upon samples. You sample the signal at some point in time and that sample represents the signal between the two time points of your sampling period. A fellow named Nyquist showed that if the period between two samples were small enough (at least 2x the highest frequency), there is no loss of information. Therefore, analog communications is based upon continuous time signals. For example, your voice modulates a microphone and the continuous time electrical signal from that microphone is sent to the destination, sometimes by modulating a carrier signal. A digital communications signal is based upon discrete time where the signal is first sampled and converted to a digital signal. That discrete signal is then transmitted to the destination. Digital communications is generally preferred for so many different reasons that it becomes almost impossible to identify them all in a Quora post. I'll list some and let others add to the list. digitized continuous time signals and inherently digital signals can be easily mixed to transmitted to their destination digital communications tends to be more robust in a noisy environment multiplexing is ridiculously simple with digital signals, making multiplex costs much lower digital signals can be packetized and sent over packet networks, which makes them more reliable different types of signals can be combined using digital communications, such as video, audio, data, sensor, etc. digital communications can be stored .in analog communication, the signal can take up voltage level corresponding to any real number, 2. hence once it is corrupted with noise it is difficult to recover the correct value. 3. repeaters in analog communication are amplifiers which also amplifies noise thereby degrading the quality of the system. 4.since the voltage can take infinite levels, it would need infinite bits to represent data. 5.analog data is continuous time continuous amplitude data. 1.in digital communication signal can take up only one among two voltage levels corresponding to 1 and 0. 2. hence even if it is corrupted by channel noise it is possible to recover the original information by using a suitable threshold at the receiver. 3.repeaters in digital communication can be wave regenerators which produce new waveforms after recovering the original information from the received waveform and hence noise does not accumulate through a digital communication link as in analog link. 4.since the voltage can take only finite number of values, it requires finite number of bits for propagation. 5.digital data is discrete time discrete amplitude data. digital communication is more efficient in terms of noise immunity and quality. --------------------------------------------------------------------------------------------------------------------- 6. Explain with suitable high level network diagram, the requirements for a new Data Centre for which you are put as the Head of Operations. Ans – refer http://www.it.northwestern.edu/bin/docs/DesignBestPractices_127434.pdf (not sure – Pradeep and team will come up soon with a better ans) ------------------------------------------------------------------------------------------------------------ 7. Explain Bandwidth, Data Terminal Equipment & Data Circuit terminating equipment (DCE). Ans – Q.1 – Page 2 ------------------------------------------------------------------------------------------------------------------------- 8. Differentiate between Synchronous and Asynchronous communication. Ans - Synchronous In synchronous data transfers, the sender and receiver take some time to communicate before they make the exchange. This communication outlines the parameters of the data exchange. This usually involves establishing which end, sender or receiver, will be in control of the transfer. Here, the two parties also ensure they are using the same timing; that is, they know when each burst ends and another begins. They also set parameters for resetting their clocks during the transfer to make sure they don't drift away from the agreed-upon timing. Asynchronous In asynchronous, or "best effort" transfers, sender and receiver do not establish the parameters of the information exchange. Rather, the sender places extra bits of data before and after each burst that indicate when each burst begins and ends. It then sends the information, and it is up to the receiver to determine how to reset its clock to match the timing of the signal. Unlike synchronous transfers, the receiver does not take time to communicate to the sender information about what it received. ------------------------------------------------------------------------------------------------------------------------------ 9. What is network topologies and network architecture? Give two examples of each. Ans – Q. 9 - Page 20 -------------------------------------------------------------------------------------------------------------------- 10. State the different type of Network Topologies in detail. Ans - Q.9 – Page no. 20 -------------------------------------------------------------------------------------------------------------------------- 11. Describe a Storage Area Network with respect to its (i) design, (ii) architecture, (iii) purpose, (iv) Testing approach, (v) management of SAN on day to day basis. ----------------------------------------------------------------------------------------------------------------------------- 12. Explain OSI model in detail. How is it differentiated from TCP Model? Ans - Q.8 – Page 19 ----------------------------------------------------------------------------------------------------------- 13. Describe Network Management. Ans - Q.10 – Page No. 31 ------------------------------------------------------------------------------------------------------------------- 14. Explain OSI model with suitable diagram and explain how it is different from the TCP Model. Ans. – Q. 8 – Pg No. 15 ------------------------------------------------------------------------------------------------------------------ 15. What are protocols? Name any two protocols not from the same layer and explain its role? Ans- Q.14 – Page - 41 ----------------------------------------------------------------------------------------------------------------- 16. What are protocols? Define at least one protocols w.r.t to the OSI model. Ans- Q.14 – Page – 41 ----------------------------------------------------------------------------------------------------------- 17. Differentiate between Wired and Wireless networks. What are the transmission Media used for both networks? Ans – Q.5 - What are the transmission Media used for both networks? – Refer Page no. 7. Wired and wireless networks - Refer page no. 9 ------------------------------------------------------------------------------------------------------------------- 18. Differentiate
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