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Solution Manual For Data Communications And Networking With Tcp|Ip Protocol
Suite 6th Edition By Behrouz Forouzan
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CHAPTER 1
Introduction
Solutions To Review Questions And Exercises
The Three Criteria Are Performance,Reliability, And Security.
Point-To-Point: Mesh, Star, And Ring.
Multipoint: Bus
1
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2
11. an internet is an interconnection of networks. the internet is the name of a spe-
cific worldwide network
12. a protocol defines what is communicated, in what way and when. this provides
accurate and timely transfer of information between different devices on a net-
work.
13. standards are needed to create and maintain an open and competitive market for
manufacturers, to coordinate protocol rules, and thus guarantee compatibility of
data communication technologies.
exercises
14. unicode uses 32 bits to represent a symbol or a character. we can define 2 32
differ-ent symbols or characters.
15. with 16 bits, we can represent up to 2 16 different
colors. 16.
a. cable links: n (n – 1) / 2 = (6 × 5) / 2 = 15
b. number of ports: (n – 1) = 5 ports needed per device
17.
a. mesh topology: if one connection fails, the other connections will still be work-
ing.
b. star topology: the other devices will still be able to send data through the hub;
there will be no access to the device which has the failed connection to the
hub.
c. bus topology: all transmission stops if the failure is in the bus. if the drop-
line fails, only the corresponding device cannot operate.
d. ring topology: the failed connection may disable the whole network unless it
is a dual ring or there is a by-pass mechanism.
18. this is a lan. the ethernet hub creates a lan as we will see in chapter 13.
19. theoretically, in a ring topology, unplugging one station, interrupts the ring. how-
ever, most ring networks use a mechanism that bypasses the station; the ring can
continue its operation.
20. in a bus topology, no station is in the path of the signal. unplugging a station
has no effect on the operation of the rest of the network.
21. see figure 1.1
22. see figure 1.2.
23.
a. e -mail is not an interactive application. even if it is delivered immediately, it
may stay in the mail-box of the receiver for a while. it is not sensitive to
delay.
b. we normally do not expect a file to be copied immediately. it is not very sensi-
tive to delay.
c. surfing the internet is the an application very sensitive to delay. we except
to get access to the site we are searching.
24. in this case, the communication is only between a caller and the callee. a
dedi-cated line is established between them. the connection is point-to-point.
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3
Figure 1.1 Solution To Exercise 21
Hub
Repeater Repeat
Er
Repeat
Er
Figure 1.2 Solution To Exercise 22
Station Station
Repeater
Repeater
Station Station
about:blank 4/170
Solution Manual For Data Communications And Networking With Tcp|Ip Protocol
Suite 6th Edition By Behrouz Forouzan
, Stuvia.com - The Marketplace to Buy and Sell your Study Material
CHAPTER 1
Introduction
Solutions To Review Questions And Exercises
The Three Criteria Are Performance,Reliability, And Security.
Point-To-Point: Mesh, Star, And Ring.
Multipoint: Bus
1
about:blank 2/170
, Stuvia.com - The Marketplace to Buy and Sell your Study Material
2
11. an internet is an interconnection of networks. the internet is the name of a spe-
cific worldwide network
12. a protocol defines what is communicated, in what way and when. this provides
accurate and timely transfer of information between different devices on a net-
work.
13. standards are needed to create and maintain an open and competitive market for
manufacturers, to coordinate protocol rules, and thus guarantee compatibility of
data communication technologies.
exercises
14. unicode uses 32 bits to represent a symbol or a character. we can define 2 32
differ-ent symbols or characters.
15. with 16 bits, we can represent up to 2 16 different
colors. 16.
a. cable links: n (n – 1) / 2 = (6 × 5) / 2 = 15
b. number of ports: (n – 1) = 5 ports needed per device
17.
a. mesh topology: if one connection fails, the other connections will still be work-
ing.
b. star topology: the other devices will still be able to send data through the hub;
there will be no access to the device which has the failed connection to the
hub.
c. bus topology: all transmission stops if the failure is in the bus. if the drop-
line fails, only the corresponding device cannot operate.
d. ring topology: the failed connection may disable the whole network unless it
is a dual ring or there is a by-pass mechanism.
18. this is a lan. the ethernet hub creates a lan as we will see in chapter 13.
19. theoretically, in a ring topology, unplugging one station, interrupts the ring. how-
ever, most ring networks use a mechanism that bypasses the station; the ring can
continue its operation.
20. in a bus topology, no station is in the path of the signal. unplugging a station
has no effect on the operation of the rest of the network.
21. see figure 1.1
22. see figure 1.2.
23.
a. e -mail is not an interactive application. even if it is delivered immediately, it
may stay in the mail-box of the receiver for a while. it is not sensitive to
delay.
b. we normally do not expect a file to be copied immediately. it is not very sensi-
tive to delay.
c. surfing the internet is the an application very sensitive to delay. we except
to get access to the site we are searching.
24. in this case, the communication is only between a caller and the callee. a
dedi-cated line is established between them. the connection is point-to-point.
about:blank 3/170
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3
Figure 1.1 Solution To Exercise 21
Hub
Repeater Repeat
Er
Repeat
Er
Figure 1.2 Solution To Exercise 22
Station Station
Repeater
Repeater
Station Station
about:blank 4/170
