Identify and explain the Computer Networks. • Interpret, and evaluate a main type of Networks and Network Classification https://youtu.be/Yr0y6Kz6g40 https://youtu.be/i3mbR-Tj0e8

1. 15-1
CS.1.03 LO.3
L. O.: Identify and explain
the Computer Networks.
Interpret, and evaluate a
main type of Networks and
Network Classification.

2. CS.1.03 Agenda
Warm up revision about N S + Sketup 5 min
PPT by teacher 15 m
On line quiz 10 min
Home work and Exit ticket 5 min
One student set in the computer another one present 10 m
Essential Questions: what is the Networks ? Why use Networks? 5 m
Video demonstration stopping then asking questions 10 m
Student presentation 10 m
Dividing students into 4 groups 15 min
PPT by teacher 10 m

3. CS.1.03 Essential Questions:
What is the Networks
? Why use Networks?
Mansion main types of
Computer Networks and
classify them? 15-3

4. 15-4
Students into 4 groups
• Tigers
• Lions
• Crocodiles
• Eagles
Part1 10m Each group will take 2
copies of a paper and study it
carefully using brain storm then
write comments and notes in a
new white paper.
Part2 10m one of Each group
will take one of the original
papers and move to the adjacent
group and do brain storm and
then write comments and notes
in a new white paper .
part3 10 min students make
presentation

5. CS.1.03 Presenting activity
15-5
• One student set in the
computer , and one
take pictures , ….and
another one present
they are working in
team work with me10 m

6. 15-6
Week 1 Networking
• Computer network A collection of
computing devices that are connected in
various ways in order to communicate and
share resources .
Usually, the connections between
computers in a network are made using
physical wires or cables .
However, some connections are wireless,
using radio waves or infrared signals

7. 15-7
Networking
• The generic term node or host refers to
any device on a network
• Data transfer rate The speed with which
data is moved from one place on a
network to another
• Data transfer rate is a key issue in
computer networks

8. Daisy chain: linked series of devices
– Hubs and switches often connected in daisy
chain to extend a network
Hubs, gateways, routers, switches, and
bridges can form part of backbone
Extent to which hubs can be connected is
limited
Backbone Networks: Serial
Backbone
Osama Ghandour Geris
Assiut STEM School8

9. 10 min Act3 - “Network
Operating Software”
• Network operating systems
co-ordinate the activities of
multiple computers across a
network
• The two major types of
network OS are:
– Peer-to-peer
– Client/server
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10. Peer to peer network OS
– In peer to peer network OS,
there is no file server or central
management source; all
computers are considered equal
– Peer to peer networks are
design primarily for small to
medium LANS
–AppleShare and
Windows for Workgroups
are examples of programs that
can function as peer to peer
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11. Client/Server network OS
– Client/server network OS
centralise functions and
applications in one or more
dedicated file servers.
– The file server provides access to
resources and provides security
–Novel Netware and
Windows NT Server are
examples of client/server
network operating systems
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12. 15-12
Networking
• Computer networks have opened up an
entire frontier in the world of computing
called the client/server model
Figure 15.1 Client/Server interaction

13. 15-13
Networking
• File server A computer that stores and
manages files for multiple users on a
network
• Web server A computer dedicated to
responding to requests (from the browser
client) for web pages

14. Analogy
Find the analogy
between
Computer Network
and
Teamwork 15-14

15. Analogy
What is the difference
between
Internet and Intranet
15-15

16. 15-16
Types of Networks
• Local-area network (LAN) A network
that connects a relatively small number of
machines in a relatively close
geographical area

17. 15-17
Types of Networks
• Various configurations, called topologies, have
been used to administer LANs
– Ring topology A configuration that connects all
nodes in a closed loop on which messages travel in
one direction
– Star topology A configuration that centers around
one node to which all others are connected and
through which all messages are sent
– Bus topology All nodes are connected to a single
communication line that carries messages in both
directions

18. Types of Networks
• A bus technology called Ethernet has become the
industry standard for local-area networks
Figure 15.2 Various network topologies
15-10

19. 15-19
Types of Networks
• Wide-area network (WAN) A network that
connects two or more local-area networks over a
potentially large geographic distance
Often one particular node on a LAN is set up to serve
as a gateway to handle all communication going
between that LAN and other networks
Communication between networks is called
internetworking
The Internet, as we know it today, is essentially the
ultimate wide-area network, spanning the entire globe

20. 15-20
Types of Networks
• Metropolitan-area network (MAN) The
communication infrastructures that have
been developed in and around large cities

21. 15-21
So, who owns the Internet?
Well, nobody does. No single person or
company owns the Internet or even
controls it entirely. As a wide-area
network, it is made up of many smaller
networks. These smaller networks are
often owned and managed by a person or
organization. The Internet, then, is really
defined by how connections can be made
between these networks.

22. Network game 5 min
• Each group will get 5 to 6
Strings then they will
create one type of
networks then picturing
and photographing or
drawing
15-22

23. 15-23
Types of Networks
Figure 15.1 Local-area networks connected across a distance to
create a wide-area network

24. 15-24
Internet Connections
• Internet backbone A set of high-speed
networks that carry Internet traffic
These networks are provided by
companies such as AT&T, GTE, and IBM
• Internet service provider (ISP) A
company that provides other companies or
individuals with access to the Internet

25. 15-25
Internet Connections
• Broadband A connection in which transfer
speeds are faster than 128 bits per second
– DSL connections and cable modems are broadband
connections
– The speed for downloads (getting data from the
Internet to your home computer) may not be the same
as uploads (sending data from your home computer
to the Internet)

26. 15-26
Firewalls ***
• Firewall A machine and its software that
serve as a special gateway to a network,
protecting it from inappropriate access
– Filters the network traffic that comes in,
checking the validity of the messages as
much as possible and perhaps denying some
messages altogether
– Enforces an organization’s access control
policy

27. 15-27
Firewalls ***
Figure 15.8 A firewall protecting a LAN

28. 15-28
Video demonstration activity 10 m
Now students listen to a
Video demonstration
stopping it then asking
questions 10 m press here

29. CS.2.07 Presenting activity
15-29
• Duties of a system
administrator 10 m
press here

30. References :
Resource Materials:
http://www.onlineprogrammingbooks.com/networking/ -
Introduction to Computer Networking
https://www.youtube.com/watch?v=LCj2HDOd_Mk
https://www.youtube.com/watch?v=vMRrwrSSJKA

31. 5 min Reflection
• What is your goal to accomplish
in next week End Using the
princibals of networks ?
Activity 5

32. What are the tools ,
devices and information
which a network engineer
should has for installing
a network ?
Home work 2
Assiut STEM School Mr. Osama Ghandour Computer Science

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Find me @

34. Thanks