نسخة network-171227041315.ppsxuhsuhsuhsushushsuh

Network

1. Computer Networks

2. oComputer Networks
A Collection of computers and devices connected to
each other .
A Network Allows computers and devices to
communicate with each other and share resources and
information .

3. •Network Classification
1.Connection Method :
Computer Network can be classified according to
H/W & S/W technology .

4. Connection Method :
Connection method can be divided in to two methods :
Wireless : is Technology designed to connect devices without wiring .
These devices use radio waves or infrared signals as a transmission
medium .

5. •Connection Method :
Ethernet : uses physical wiring to connect devices . Such as hubs ,
switches , bridges and Routers .
Also ITU-T G.hn technology uses existing home wiring , such as coaxial
cable, phone line and power line .to create a high speed local area
network

6. •Network Classification
2. Scale : network can be classified as :
A- Local Area Network ( LAN )
B- Wide Area Network ( WAN)
C- Metropolitan Area Network ( MAN )
D- Personal Area Network ( PAN )
E- Virtual Private Network ( VPN )
F- Campus Area Network ( CAN )
G- Storage Area Network ( SAN )

7. •Network Classification
3- Functional relationship ( Network Architecture )
Computer Network Can be classified as :
Active Network
Client Server
Peer – to – Peer

8. •Network Classification
4- Network Topology :
Computer Network may be classified according to the network topology :
A- Bus Network
B- Star Network
C- Ring Network
D- Mesh Network
E- Star – Bus Network
F- Tree Network

9. Types of Common Networks
2- Local Area Network :
Is a computer Network Covering a small physical Area like a home , office , small group of buildings
such as a school or an airport .
Local Area Network May have wire or Wireless technology
The Characteristics of LANs :
Higher data transfer rates , smaller geographic range , and lack of a need for leased
telecommunication line .

10. Types of Common Networks
3- Campus Area Network :
Is a computer Network made up of an interconnection of LANs
within a limited geographical Area .

11. Campus Area Network
It can considered one form of a metropolitan area network ,specific
to an academic setting .
CAN Link variety of campus building including : academic
departments , the university library and student resident halls ,
CAN is larger than a local Area network but smaller than wide area
network ( WAN ) in some cases .
The main aim of CAN is to facilitate students accessing internet and
university resources .

12. Types of Common Networks
4- Metropolitan Area Network :
•Is a Network that connects two or more LAN or CAN together , But does
not extend beyond the boundaries of the city .
•Router Switches and hubs are connected to create a MAN

13. Types of Common
Networks
5- Wide Area Network :
•Is the Network covers wide or Broad Area .
•Any network whose communications links cross metropolitan , regional or
national boundaries .
•Largest than ( LAN , MAN , CAN , PAN )
•Such as internet

14. Types of Common Networks
6- Global Area Network
Is a model for supporting mobile communication across an arbiter number
of wireless LANs , satellite coverage area .

15. Types of Common Networks
6- Virtual Private Network :
Is a computer network in witch some of the links between nodes are carried by open
connections of virtual circuit in some larger network instead of by physical wires .

16. •INTERNETWORK
•Internetworking involves connecting two or more , distinct
computer networks or network segments via a common routing
technology .
•Internetwork often shorted to internet.
•In modern practice , the interconnected networks use the
internet protocols .
•There are Three Internetworks :
1.Intranet
2.Extranet
3.Internet

17. INTERNETWORK
Intranet :
An intranet is a set of networks using the internet protocol and
IP-based tools such as web browsers and file transfer
applications , that is under the control of single administrative
entity .

18. INTERNETWORK
•Extranet :
An extranet is a network or internetwork that is limited in
scope to a single organization or entity but which also has
limited connection to the networks of one or more .

19. INTERNETWORK
•INTERNET
The internet is a specific internetwork . It consist of world wide
interconnection of governmental , academic , public & Private
Network
WWW : World Wide Web
The ” Internet “ is most commonly spelled with a capital “ I “

20. Basic hardware components
All networks are made up of basic hardware building blocks to
interconnect network nodes such as :
1.NICs
2.Bridges
3.Hubs
4.Switches
5.Routers
6.Repeater

21. Basic hardware components
1- Network interface Cards
NICs is a piece of computer hardware designed to
allow computers to communicate over a computer
network .

22. Basic hardware components
2- Repeaters
A repeater is an electronic devices that receive a signal
and transmit it at a higher power level , or to other side of
an obstruction .

23. Basic hardware components
3- Hubs :
A hub contains multiple ports , when a packet arrives at one port ,
it copied unmodified to all ports of the hub for transmission .

24. Basic hardware components
4-BRIDGES
A network bridges concepts multiple network at the data link layer
( layer 2 ) of the OSI model .

25. Bridges come in Three basic types :
1- Local Bridges : Directly connect local area network ( LANs )
2- Remote Bridges : Can be used to create a wide area network
( WAN ) link between LANs .
3- Wireless Bridges: Can be used to join LANs or connect remote
stations to LANs .

26. Basic hardware components
5- switches :
is a device that forward and filter OSI layer 2 datagrams between ports
based on The MAC address in the packets .
Some Switches are capable of routing based on IP address but are still
called witches as a marketing term .

27. Basic hardware components
6- Routers :
Router are networking devices that forward data packets between
networks .
Router work at the network Layer