What is a Computer Network?
Video Activity
A computer network is a group of computers (hosts/nodes) and a group of computer peripherals connected via a transmission media and connecting devices. In this lesson you will learn more about a computer network and what all the moving parts within a network are responsible for. Computer Types- Personal Computers (PCs) Desktop Computer Laptops Tabl...
Video Description
A computer network is a group of computers (hosts/nodes) and a group of computer peripherals connected via a transmission media and connecting devices. In this lesson you will learn more about a computer network and what all the moving parts within a network are responsible for. Computer Types- Personal Computers (PCs)
- Desktop Computer
- Laptops
- Tablets
- Smart Mobile Phones
-
Embedded Systems in Machines
-
Internet of Things (IoT)
- Allows things/machines to exchange information between each other in order to offer a certain service required by human users
-
Computer Peripherals- Hardware connected to computer - the following can be directly connected to the computer network and be part of the network to act as sources and destinations of data being transferred
- Printers
- Scanners
- Storage Media
-
Cloud Computing and Data Center - the following can be seen as connected through transmission media in a local network inside the center to offer a certain type of service required by the computer user
- Servers
- Storage Devices
- Managing Terminals
- Offers several types of services
Transmission Media- Wired (Cables)
-
Copper
- Coaxial Cables
- Twisted Pair Cables - shielded [STP]/Unshielded [UTP]
-
Fiber Optic - does not transmit electricity, it transmits light
- Single Made
- Multi-mode
-
Wireless
- Used air as Transmission Media
- Frequency Band
- Area of Coverage
Network Benefits and Services- Resources Sharing
-
Hardware resources - one device can be shared across many users. Hardware resources saves cost and time.
- Computer Peripherals
- Printers/scanners
- Storage Media
- Processors
-
Software Resources
- File Sharing
- Databases
-
Applications
- Example: a game that can be used by several users over the internet
-
Services
- Browsing and E-mail
- Voice Calls and Video Conferences
Basic Network Elements- End Devices
- Communicating devices with each other (Send/Receive)
-
Connecting Devices
-
Switches, routers, and access points
- Not meant to be sources or destinations of information but rather act as transferring entities for the information to help or facilitate the moving process of information across the network
-
-
Medium
-
Distinguishes how elements are connected
- Wireless or wired
-
-
Messages
- Information travelling through network
-
Protocols
- Rules governing how information is transferred
Video Transcription
00:01
welcome to our course. Let's start our course by answering this question. What is a computer letter?
00:09
The definition of a computer network is simply as follows. It's a group of computers that are sometimes called hosts or notes and a group off computer peripherals that are all connected together via transmission media and some connecting devices.
00:29
All of these elements form what we call a computer network.
00:37
The types off computers have changed it.
00:40
Nowadays, we have laptops, tablets, smart mobile phones.
00:46
We usedto have only personal computers, or peces that were also called desktop computers. Nowadays, we have others that are mobile and that can transfer and send and receive information over the network.
01:04
Every single human
01:07
can now be connected toe a computer network through peces through laptops, tablets, smart mobile phones and threw water school the embedded systems inside, some off the electrical or mechanical machines. Yes,
01:23
some of these machines can send and transfer and exchange data and information between each other
01:33
transparently without the interference or the interaction off the human users. In order to offer a certain service for him with his minimal or with the least interaction from his side.
01:49
This concept is known as Internet of things.
01:53
Internet of things allows things machines to exchange information between each other in order to offer a certain service required by human users.
02:07
The peripherals
02:09
that can be connected to a computer are simply
02:14
the hard way.
02:15
The printer's, the scanners, the storage media.
02:20
All of these are called
02:22
preference.
02:23
These professionals can also be connected to a computer network as senders and as receivers off information
02:32
and orders from the computer users
02:36
to execute something that he wants to be done.
02:42
Printers, scanners and storage media can be directly connected to the computer network and be part of it
02:52
toe act as sources and destinations off data being transferred.
02:59
If we have a look inside a cloud computing or a data center,
03:04
we can see some servers, some storage devices and some terminals that are used for managing and configuration off the devices. Inside this cloud, computing or data centers,
03:17
all of these can be seen as connected through transmission media in a local network. Inside the center
03:27
toe offer a certain type of service required by the computer users, either infrastructure as a service or platform as a service or software. The service.
03:38
This newly introduced concept is known as the Cloud Computing Concepts, and that is
03:46
mainly depending on computer networks.
03:52
The transmission media.
03:53
The transmission media used by a computer network can be the wired media, the cables or the wireless media using air as the transmission media,
04:05
the wired media.
04:08
The cables can be made off copper or can be made or fiber optic
04:15
copper cables can either be co axial cables or twisted pair cables and in turn, that Western pear cables can either be shielded cables or unshielded cables, either STP Sheila Twisted pair or you TP cables. Unshielded twisted pack.
04:34
The fiber optic cables does not transmit electricity. It transmits light
04:43
light moves in the fiber optic cables in the form off single mode light or multi mode light. The difference between single mode and multi mode is in the capacity and the speed off
04:57
this
04:58
cable,
05:00
the wireless transmission media using air
05:03
depends mainly on a specified frequency band and a certain area or distance off coverage.
05:12
Every wireless technology differs from the other in the utilized frequency band, and they utilized area off coverage or the distance between
05:21
the sender and receiver covered by this wireless network.
05:27
Every wireless technology has a name, the band and a limited and known area off coverage
05:33
toe transfer data across
05:38
the benefit off connecting computers through a network
05:42
mainly lies in resources trading
05:46
resources, either hardware or software
05:50
Hardware resource is like the computers. Reference. Printers, scanners and other preference that can be connected to computers can also be shared through a computer network.
06:03
One copy off the printer can serve 10 users instead off buying 10 copies off printers. To serve these 10 users we hear save money, Safe Coast, save effort and also safe time
06:20
through one copy off the hardware that can be shared
06:25
toe many users. The storage media can act
06:30
in the same way
06:30
one storage media can store for several users. The processing Power one
06:36
supercomputing multi processor server
06:41
can help
06:42
in
06:44
the processing off several computers. If shared through the network,
06:48
the software resources that can be shared through the network can be a file that can be copied and pasted over the letter that can be shared between two devices Over the Net.
07:00
It can be a database database off students that can be shared through professors database off employees shared through the
07:10
company
07:12
accounting the portmanteau calculate their
07:15
salaries and their bonuses.
07:18
Applications also can be shared over the Net. Turkey. They are also software Resource is
07:26
an example of an application. The simplest example is a game, a game that can be played by several users over the letter. This is an application that is used over the network by several users, and in real time
07:42
service is service is that can be offered over. The network can be
07:48
the browsing service,
07:50
searching for information over the network
07:54
and exchanging email messages across the user's off the writer.
07:59
These are the most commonly used. Service is
08:03
also establishing voice schools, and video conference is over. The network are one off the
08:09
common uses off a computer network inside an enterprise.
08:18
The basic network elements are mainly the end devices. These are
08:22
the communicating devices, the senders and the receivers, the sources and the distillations off information.
08:31
These are the target off the network to communicate with each other.
08:35
Other devices exist inside the network as intermediate devices as connecting devices such as the switches, the rotors and the excess points. Such devices are not meant to be sources or destinations off information, but they are acting as
08:54
transferring entities for the information
08:58
toe help or facilitate it
09:01
that
09:01
moving process off
09:05
these information across the Net.
09:07
The medium used through the information network
09:13
specifies how these devices are connected. Are they connected in a wired way or in a wireless way? Are they going to use the cables or the air as the media off connection
09:26
messages? The messages are the information that are needed to be traveling through the network needed to be transferred needed to be
09:37
communicated from the sender. Tow the receiver messages are also the target off the existence off computer network. We establish computer network to transfer messages
09:52
across the end devices through human users.
09:56
The protocols off a computer network
10:01
rules and governs how the information is transferred.
10:05
The protocols are the agreements and are the standards that every
10:11
device either connecting were and device should follow and should take care off when dealing with information inside the computer network.
10:22
Hopefully, we have now answered what a computer network is.
10:28
Thank you
Up Next
Network Fundamentals
In this basic Network Fundamentals course, you will get an introduction to basic networking concepts to expand your knowledge about network security. You will get a complete overview of networks including wired and wireless computer networks, devices, and protocols.
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