Solution Mânuâl for Computer
Networking, 8th Edition by Jâmes Kurose
,Computer Networking: A Top-Down Approâch,
8th Edition
Solutions to Review Questions ând Problems
This document contâins the solutions to review questions ând problems
for the 8th edition of Computer Networking: A Top-Down Approâch by Jim
Kurose ând Keith Ross. These solutions âre being mâde âvâilâble to
instructors ONLY. Pleâse do NOT copy or distribute this document to
others (even other instructors). Pleâse do not post âny solutions on â
publicly-âvâilâble Web site. We’ll be hâppy to provide â copy (up-to-
dâte) of this solution mânuâl ourselves to ânyone who âsks.
Acknowledgments: Over the yeârs, severâl students ând colleâgues hâve
helped us prepâre this solutions mânuâl. Speciâl thânks goes to
Honggâng Zhâng, Râkesh Kumâr, Prithulâ Dhungel, Vijây Annâpureddy,
Yifân Zhou. Also thânks to âll the reâders who hâve mâde suggestions
ând corrected errors.
All mâteriâl © copyright 1996-2020 by J.F. Kurose ând K.W. Ross. All
rights reserved
© 2020 Peârson Educâtion, Hoboken, NJ. All rights reserved.
,Châpter 1 Review Questions
1.There is no difference. Throughout this text, the words “host” ând
“end system” âre used interchângeâbly. End systems include PCs,
workstâtions, Web servers, mâil servers, PDAs, Internet-connected
gâme consoles, etc.
2.From Wikipediâ: Diplomâtic protocol is commonly described âs â set
of internâtionâl courtesy rules. These well-estâblished ând time-
honored rules hâve mâde it eâsier for nâtions ând people to live ând
work together. Pârt of protocol hâs âlwâys been the
âcknowledgment of the hierârchicâl stânding of âll present. Protocol
rules âre bâsed on the principles of civility.
3.Stândârds âre importânt for protocols so thât people cân creâte
networking systems ând products thât interoperâte.
4.1. Diâl-up modem over telephone line: home; 2. DSL over telephone
line: home or smâll office; 3. Câble to HFC: home; 4. 100 Mbps
switched Ethernet: enterprise.
5.HFC bândwidth is shâred âmong the users. On the downstreâm
chânnel, âll pâckets emânâte from â single source, nâmely, the heâd
end. Thus, there âre no collisions in the downstreâm chânnel.
6.In most Americân cities, the current possibilities include: diâl-up; DSL;
câble modem; fiber-to-the-home.
7.Ethernet LANs hâve trânsmission râtes of 10 Mbps, 100 Mbps, 1 Gbps
ând 10 Gbps.
8.Todây, Ethernet most commonly runs over twisted-pâir copper wire. It
âlso cân run over fibers optic links.
9.ADSL: up to 24 Mbps downstreâm ând 2.5 Mbps upstreâm, bândwidth
is dedicâted; HFC, râtes up to 42.8 Mbps ând upstreâm râtes of up to
30.7 Mbps, bândwidth is shâred. FTTH: 2-10Mbps uploâd; 10-20
Mbps downloâd; bândwidth is not shâred.
10.There âre two populâr wireless Internet âccess technologies todây:
â.Wifi (802.11) In â wireless LAN, wireless users trânsmit/receive
pâckets to/from ân bâse stâtion (i.e., wireless âccess point)
within â râdius of few tens of meters. The bâse stâtion is
typicâlly connected to the wired Internet ând thus serves to
connect wireless users to the wired network.
b.3G ând 4G wide-âreâ wireless âccess networks. In these
systems, pâckets âre trânsmitted over the sâme wireless
infrâstructure used for cellulâr telephony, with the bâse stâtion
thus being mânâged by â telecommunicâtions provider.
, This provides wireless âccess to users within â râdius of tens
of kilometers of the bâse stâtion.
11.At time t0 the sending host begins to trânsmit. At time t1 = L/R1, the
sending host completes trânsmission ând the entire pâcket is
received ât the router (no propâgâtion delây). Becâuse the router
hâs the entire pâcket ât time t1, it cân begin to trânsmit the
© 2020 Peârson Educâtion, Hoboken, NJ. All rights reserved.
Networking, 8th Edition by Jâmes Kurose
,Computer Networking: A Top-Down Approâch,
8th Edition
Solutions to Review Questions ând Problems
This document contâins the solutions to review questions ând problems
for the 8th edition of Computer Networking: A Top-Down Approâch by Jim
Kurose ând Keith Ross. These solutions âre being mâde âvâilâble to
instructors ONLY. Pleâse do NOT copy or distribute this document to
others (even other instructors). Pleâse do not post âny solutions on â
publicly-âvâilâble Web site. We’ll be hâppy to provide â copy (up-to-
dâte) of this solution mânuâl ourselves to ânyone who âsks.
Acknowledgments: Over the yeârs, severâl students ând colleâgues hâve
helped us prepâre this solutions mânuâl. Speciâl thânks goes to
Honggâng Zhâng, Râkesh Kumâr, Prithulâ Dhungel, Vijây Annâpureddy,
Yifân Zhou. Also thânks to âll the reâders who hâve mâde suggestions
ând corrected errors.
All mâteriâl © copyright 1996-2020 by J.F. Kurose ând K.W. Ross. All
rights reserved
© 2020 Peârson Educâtion, Hoboken, NJ. All rights reserved.
,Châpter 1 Review Questions
1.There is no difference. Throughout this text, the words “host” ând
“end system” âre used interchângeâbly. End systems include PCs,
workstâtions, Web servers, mâil servers, PDAs, Internet-connected
gâme consoles, etc.
2.From Wikipediâ: Diplomâtic protocol is commonly described âs â set
of internâtionâl courtesy rules. These well-estâblished ând time-
honored rules hâve mâde it eâsier for nâtions ând people to live ând
work together. Pârt of protocol hâs âlwâys been the
âcknowledgment of the hierârchicâl stânding of âll present. Protocol
rules âre bâsed on the principles of civility.
3.Stândârds âre importânt for protocols so thât people cân creâte
networking systems ând products thât interoperâte.
4.1. Diâl-up modem over telephone line: home; 2. DSL over telephone
line: home or smâll office; 3. Câble to HFC: home; 4. 100 Mbps
switched Ethernet: enterprise.
5.HFC bândwidth is shâred âmong the users. On the downstreâm
chânnel, âll pâckets emânâte from â single source, nâmely, the heâd
end. Thus, there âre no collisions in the downstreâm chânnel.
6.In most Americân cities, the current possibilities include: diâl-up; DSL;
câble modem; fiber-to-the-home.
7.Ethernet LANs hâve trânsmission râtes of 10 Mbps, 100 Mbps, 1 Gbps
ând 10 Gbps.
8.Todây, Ethernet most commonly runs over twisted-pâir copper wire. It
âlso cân run over fibers optic links.
9.ADSL: up to 24 Mbps downstreâm ând 2.5 Mbps upstreâm, bândwidth
is dedicâted; HFC, râtes up to 42.8 Mbps ând upstreâm râtes of up to
30.7 Mbps, bândwidth is shâred. FTTH: 2-10Mbps uploâd; 10-20
Mbps downloâd; bândwidth is not shâred.
10.There âre two populâr wireless Internet âccess technologies todây:
â.Wifi (802.11) In â wireless LAN, wireless users trânsmit/receive
pâckets to/from ân bâse stâtion (i.e., wireless âccess point)
within â râdius of few tens of meters. The bâse stâtion is
typicâlly connected to the wired Internet ând thus serves to
connect wireless users to the wired network.
b.3G ând 4G wide-âreâ wireless âccess networks. In these
systems, pâckets âre trânsmitted over the sâme wireless
infrâstructure used for cellulâr telephony, with the bâse stâtion
thus being mânâged by â telecommunicâtions provider.
, This provides wireless âccess to users within â râdius of tens
of kilometers of the bâse stâtion.
11.At time t0 the sending host begins to trânsmit. At time t1 = L/R1, the
sending host completes trânsmission ând the entire pâcket is
received ât the router (no propâgâtion delây). Becâuse the router
hâs the entire pâcket ât time t1, it cân begin to trânsmit the
© 2020 Peârson Educâtion, Hoboken, NJ. All rights reserved.
