Homework1_Fall_2010_solutions

Homework1_Fall_2010_solutions - CS 132 Discussion Homework...

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CS 132 Discussion Homework 1 Oct. 13, 2010
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#1 Explain amplitude modulation, phase modulation and frequency modulation. School of ICS, UC Irvine 2 CS 132
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#1 Explain amplitude modulation, phase modulation and frequency modulation. School of ICS, UC Irvine 3 CS 132
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#2 Why do we use layering in computer networks? Check slides…(p46, 52, introduction.ppt) Use layers to hide complexity Each layer implements a service Layer N uses service provided by layer N-1 layer N-1 provides a service to layer N Protocols Each layer communicates with its peer by a set of rules etwork communication is very complex Network communication is very complex Testing and maintenance is simplified School of ICS, UC Irvine 4 CS 132
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#3 Name the 7 OSI layers and give the corresponding functionalities for each layer. 60~68 introduction ppt p60 68, introduction.ppt. School of ICS, UC Irvine 5 CS 132
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ISO OSI Layering Architecture ost A ost B Application Layer Presentation Application Protocol Presentation Protocol Host A Host B Application Layer Presentation Layer Session Layer Session Protocol Layer Session Layer Transport Layer Network Transport Protocol Transport Layer Network Network Network Layer Data Link Layer Layer Data Link Layer Layer Data Link Layer Layer Data Link Layer School of ICS, UC Irvine 6 CS 132 Physical Layer Physical Layer Physical Layer Physical Layer IMP IMP
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#4 Briefly describe the difference between simplex, half duplex and full duplex ansmissions transmissions. Check notes…(p3-p6, data-link-layer.ppt) implex Simplex Data only flows in one direction Half duplex Data flows one direction at a time Duplex ata flows in both directions simultaneously School of ICS, UC Irvine 7 CS 132 Data flows in both directions simultaneously
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#5 Name a popular error detection and correction mechanism and describe how each works. arity bits, CRC etection Parity bits, CRC detection Hamming Code – detection and correction 18 data- k- yer ppt p18, data link layer.ppt School of ICS, UC Irvine 8 CS 132
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#6 Explain the difference between a reactive and preventative congestion control method. List some examples of each congestion control method and explain how they work. Reactive Mitigate congestion after congestion is detected E.g,. Packet discarding, Choke Packets reventive Preventive Prevent congestion from happening beforehand E.g, Isarithmic Flow Control, Resource Reservation School of ICS, UC Irvine 9 CS 132 (p34~38, introduction.ppt)
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#7 Name 2 popular flow control mechanisms and describe how each works. Stop and Wait (p61-65, data-link-layer.ppt) Only send one frame each time receiver sends an acknowledgement frame telling A receiver sends an acknowledgement frame telling the sender to transmit the next data frame Sliding window (p73-83, data-link-layer.ppt) Send multiple frames Keep track of the packet sequences sent and their spective acknowledgements received.
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This note was uploaded on 03/24/2011 for the course CS 132 taught by Professor Suda,t during the Fall '08 term at UC Irvine.

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Homework1_Fall_2010_solutions - CS 132 Discussion Homework...

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