计算机网络第六版答案

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Computer Networking: A Top-Down Approach, 6th Edition Solutions to Review Questions and Problems Version Date: May 2012 This document contains the solutions to review questions and problems for the 5th edition of Computer Networking: A Top-Down Approach by Jim Kurose and Keith Ross. These solutions are being made available to instructors ONLY. Please do NOT copy or distribute this document to others (even other instructors). Please do not post any solutions on a publicly-available Web site. We’ll be happy to provide a copy (up-to-date) of this solution manual ourselves to anyone who asks. Acknowledgments: Over the years, several students and colleagues have helped us prepare this solutions manual. Special thanks goes to HongGang Zhang, Rakesh Kumar, Prithula Dhungel, and Vijay Annapureddy. Also thanks to all the readers who have made suggestions and corrected errors. All material © copyright 1996-2012 by J.F. Kurose and K.W. Ross. All rights reserved Chapter 1 Review Questions There is no difference. Throughout this text, the words “host” and “end system” are used interchangeably. End systems include PCs, workstations, Web servers, mail servers, PDAs, Internet-connected game consoles, etc. From Wikipedia: Diplomatic protocol is commonly described as a set of international courtesy rules. These well-established and time-honored rules have made it easier for nations and people to live and work together. Part of protocol has always been the acknowledgment of the hierarchical standing of all present. Protocol rules are based on the principles of civility. Standards are important for protocols so that people can create networking systems and products that interoperate. 1. Dial-up modem over telephone line: home; 2. DSL over telephone line: home or small office; 3. Cable to HFC: home; 4. 100 Mbps switched Ethernet: enterprise; 5. Wifi (802.11): home and enterprise: 6. 3G and 4G: wide-area wireless. HFC bandwidth is shared among the users
the packet's change the phrase“ Alice, I owe you$1000to“ Alice, I owe you$10.000” Msg name purpose H三LO< userid> let server know that there is a card in the ATM machine ATm card transmits user id to server PASSWD <passwd> User enters pIn, which is sent to server BALANCE User requests balance WITHDRAW- < amount> User asks to withdraw money BYE user all done Msg name purpose PASSWD Ask user for PIn (password) last requested operation (PASSWD, WITHDRAWL ERR last requested operation (PAS SWD, WITHDRAWL in ErROR AMouNT <amt> sent in response to BALANCE request user done, display welcome screen at ATM client serve H豆LO( userId) (check if valid userid) PASSWD PASSWD <passwd> ->(check password) Ok (password is Ox BALANCE AMOUNT <amt> W工 THDRAW<amt> check if enough s to cover 认 ithdraw⊥ ○K ArM dispenses BYE BYE H豆LO( userc) -->(check if valid userid P△SsWD PASSWD <passwd> (check password) OK (password is OK) BALANCE AMOuNT <amt> WITHDRAWI <amt> check if enough to cover withdrawl ERR (not enough funds error msg displayed no s given out BYE BYE ×

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