Copyright © 2020, 2011, 2003 Pearson Education, Inc. All Rights Reserved
Chapter 1
Introduction
Copyright © 2020, 2011, 2003 Pearson Education, Inc. All Rights Reserved
Uses of Computer Networks
•Computer network
–Large number of separate but interconnected computers do a job
–Collection of interconnected, autonomous computing devices
–Interconnected computers can exchange information
•Example: the Internet
•Network uses
–Access to information
–Person-to-person communication
–Electronic commerce
–Entertainment
–The Internet of Things
Copyright © 2020, 2011, 2003 Pearson Education, Inc. All Rights Reserved
Access to Information (1 of 4)
•Web browser and smart phones retrieve information from
various Web sites
•Social media platforms support targeted behavioral
advertising
•Online digital libraries and retail sites host digital content
•Client-server model forms the basis of network usage
•Web applications: Server generates Web pages in
response to client requests
•Peer-to-peer communication: Individuals form a loose
group to communicate with others in the group
Copyright © 2020, 2011, 2003 Pearson Education, Inc. All Rights Reserved
Access to Information (2 of 4)
In the client-server model, a client explicitly requests information from a server that
hosts that information.
Copyright © 2020, 2011, 2003 Pearson Education, Inc. All Rights Reserved
Access to Information (3 of 4)
Communication takes the form of the client process sending a message over the network
to the server process. The client process then waits for a reply message.
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
1
/
87
100%
![Probiolite Reviews: [Scam Or Legit] Update 2021 || Is It Really Work?](http://s1.studylibfr.com/store/data/010096955_1-6844df3a24d266a838e3ff88d79a995f-300x300.png)