Solutions-DCC-1 - SOLUTIONS MANUAL DATA AND COMPUTER...

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S OLUTIONS M ANUAL D ATA AND C OMPUTER COMMUNICATIONS E IGHTH E DITION C HAPTERS 1 - 12 W ILLIAM S TALLINGS Copyright 2007: William Stallings
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-2- © 2007 by William Stallings All rights reserved. No part of this document may be reproduced, in any form or by any means, or posted on the Internet, without permission in writing from the author. Selected solutions may be shared with students, provided that they are not available, unsecured, on the Web.
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-3- N OTICE This manual contains solutions to all of the review questions and homework problems in Data and Computer Communications, Eighth Edition . If you spot an error in a solution or in the wording of a problem, I would greatly appreciate it if you would forward the information via email to ws@shore.net. An errata sheet for this manual, if needed, is available at ftp://shell.shore.net/members/w/s/ws/S . W.S.
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-4- TABLE OF CONTENTS Chapter 2: Protocol Architecture. .................................................................................. 5 Chapter 3: Data Transmission. ...................................................................................... 9 Chapter 4: Transmission Media. .................................................................................. 13 Chapter 5: Signal Encoding Techniques. .................................................................... 17 Chapter 6: Digital Data Communications Techniques . ........................................... 26 Chapter 7: Data Link Control Protocols. .................................................................... 33 Chapter 8: Multiplexing. ............................................................................................... 40 Chapter 9: Spread Spectrum. ....................................................................................... 45 Chapter 10: Circuit Switching and Packet Switching. ................................................ 48 Chapter 11: Asynchronous Transfer Mode. ................................................................. 53 Chapter 12: Routing in Switched Networks. ............................................................... 59
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-5- A A NSWERS TO Q Q UESTIONS 2.1 The network access layer is concerned with the exchange of data between a computer and the network to which it is attached. 2.2 The transport layer is concerned with data reliability and correct sequencing. 2.3 A protocol is the set of rules or conventions governing the way in which two entities cooperate to exchange data. 2.4 A PDU is the combination of data from the next higher communications layer and control information. 2.5 The software structure that implements the communications function. Typically, the protocol architecture consists of a layered set of protocols, with one or more protocols at each layer. 2.6 Transmission Control Protocol/Internet Protocol (TCP/IP) are two protocols originally designed to provide low level support for internetworking. The term is also used generically to refer to a more comprehensive collection of protocols developed by the U.S. Department of Defense and the Internet community. 2.7 Layering decomposes the overall communications problem into a number of more manageable subproblems. 2.8 A router is a device that operates at the Network layer of the OSI model to connect dissimilar networks. 2.9 IPv4. 2.10 No, other transport layer protocols, such as UDP, are also used. Some traffic uses no transport protocol, such as ICMP. 2.11 IPv4 - 32 bits; IPv6 - 128 bits A A P P ROBLEMS 2.1 The guest effectively places the order with the cook. The host communicates this order to the clerk, who places the order with the cook. The phone system provides the physical means for the order to be transported from host to clerk. The cook C HAPTER 2 P ROTOCOL A RCHITECTURE , TCP/IP, AND I NTERNET -B ASED A PPLICATIONS
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-6- gives the pizza to the clerk with the order form (acting as a "header" to the pizza).
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Solutions-DCC-1 - SOLUTIONS MANUAL DATA AND COMPUTER...

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