let's now categorize computer networks and know the categories off a computer networks. What could it be
categorizing? Computer networks can be according toe the transmission mode off this network, the geographical area covered by this network or the administration type applied to this network.
The transmission mode can either be simplex half duplex or full duplex
in a simplex network.
The data always flow from the same source, toe the same destination over the media. Off the snatcher,
the source of data is always the same, and the destination is always the same as well.
The direction of data is always from the same source toe the same destination in a simplex nutter.
In 1/2 duplex network.
The source can be a destination, and the destination can be the source of data Both can send to each other, but at different time. Inter Vince, which means the source can send to the distinction at Time t one
and after a certain period of time at time, T to the destination can send to the source back
in a full duplex network.
Each station can be the source and the destination at any time.
The direction off data all the time is bi directional.
The source and registration can be any machine at any time in a full duplex. Better,
the signaling mode off the network is also one off. The terminology is, we need to know
What is the meaning Off Days Band and Broadbent
based band is one signal that flows at a certain time on the network media. In a digital four.
It is a digital local signal flowing. For example, as in this image from the workstation, tow the modem
the room were inside the building or inside the local area network.
This biz man signal gets to be modulated
Then signal becomes a broadband signal that can trafficking a long distance
from the modem till the central office off
PSD and all the public
service telephone network
divides the network media into multiple challenge.
This allows for several signals to exist.
The broadband signal is Anna look modulated signal. While the bass band is digital.
Categorizing networks according to geographical area
can lead to having local area network or land
or wider network, or when,
as you can see in the image a wen or wider than it can be formed off different lands connected through when Linc,
simply it when can be
too connected, lands
through a large geographical area.
The land is a group of computers connected in small geographical area.
Small means less than three kilometres,
just only group of computers connected inside one building one company, one entity having a group of computers, telephones, televisions,
network printers and others connected through one switch. This is a very simple LEN.
Lands are used to share files, and service is inside this company or building.
It's a communication off high speed, which means that the speed off this land can be one gigabit per second or even more according to the speed off the switch.
The land is always under the administrative control off its owners.
the land is under the user. Administrative control
technologies used to establish a land can be Internet or token drink
the wider in a network, or when is a group of computers connected in large geographical area.
Large means more than three kilometres.
Compared to a land, the wen is low speed. It is in the range off megabits per second speed
the when it under the administration off the ice be Internet service provider,
Since the links connecting the win belongs to this eyes be
the technologies used to establish when can be the dial up
the eyes, the end or the integrated service is digital entered the D S L or the digital subscriber line
X 25 frame relay or the most recent? Which is the 80 m, the asynchronous transfer mode?
These are all technologies that are used to connect computers through a wen
the most common used now for connecting computers to the Internet are, of course, the D S L technology, either synchronous or a synchronous. The ascent,
categorizing an utter according to administration type leads toe having peer to peer network or client server network
in a peer to peer network. Each host provide and consume network service is
each host has the same administrative privileges.
Each user sitting on a machine is the administrator of this machine
and shares whatever service is he likes and also receives whatever requests he likes and access any file he would like to access
according to the permissions off this peer to peer, not horrible force
in a client server network. Some hosts are assigned server roads.
What is the meaning of a surface? The server is a superior computer superior in hardware and software.
The hardware of a server is big.
big network connection, big memory
and also powerful processing.
The software off the server is
a server operating system, which is powerful enough to run such hardware.
Servers provide network resources to hosts.
Each server exists on the network for the purpose of a certain service.
A server can be Web server, mail server, Deanna Server or other server, which means that this machine server
dedicated for a certain service
other hosts that are not servers are assigned client rules clients consume the network Resources Client's son requests to servers and receives the reply off such requests from the servers.
So they are recipients, so they
are consumers on the network,
according to administration type.
From the point of view off centralisation
in the peer to peer network, no central server exists
in a client server. Old client machines connect to a central server
from the storage point of view. Each machine share files equally with each other.
But in the client server network, old files and folders
are stored on dedicated storage on the surf.
Klein's only exist such wife
from the Coast point off you peer to peer networks are expensive,
while the client server networks are expensive because off the coast of the service,
the coast of the hardware and the coast off the license off the software required for the server to run
the peer to peer network is scalable in the range off home or small office.
While the client server
scale is in a medium or large enterprise scale,
the operating systems existing on a peer to peer network is the client operating systems. Only
the operating systems existing on a client server are the server breathing system, such as Lennox or Microsoft Windows Server Toe handle multiple requests from the lines.
Hopefully, we have now introduced the different categories off computer networks. Thank you