#08 - Computer network devices | #Unit_02 #Grade_10 #Tamil



A network, in computing, is a cluster of 2 or more devices which will communicate. In follow, a network is comprised of variety of various pc systems connected by physical and/or wireless connections. the dimensions will vary from one computer sharing out basic peripherals to huge data centres set round the World, to the net itself. regardless of scope, all networks enable computers and/or people to share information and resources.

Advantages of networks

1.      Sharing devices such as printers saves money.
2.      Site (software) licences are likely to be cheaper than buying several standalone licences.
3.      Files can easily be shared between users.
4.      Network users can communicate by email and instant messenger.
5.      Security is good - users cannot see other users' files unlike on stand-alone machines.
6.      Data is easy to backup as all the data is stored on the file server.

Disadvantages of networks

1.      Purchasing the network cabling and file servers can be expensive.
2.      Managing a large network is complicated, requires training and a network manager usually needs to be employed.
3.      If the file server breaks down the files on the file server become inaccessible. Email might still work if it is on a separate server. The computers can still be used but are isolated.
4.      Viruses can spread to other computers throughout a computer network.
5.      There is a danger of hacking, particularly with wide area networks. Security procedures are needed to prevent such abuse, e.g. a firewall.
Computer network devices
There should be two or more computers to build a computer network. Connection devices used to connect computers with each other. Here is the common hardware network device list:
  1. Hub
  2. Routers
  3. Switches
  4. Firewall
  5. Bridges
  6. Modem 
  7. Access Point
  8. Content Filter
  9. Load Ba lancer
  10. Packet Sharpe
  11. VPN concentration
Hub
A hub, within the context of networking, may be a hardware device that relays communication information. A hub sends information packets (frames) to any or all devices on a network, in spite of any raincoat addresses contained within the information packet.


Routers
Router could be a network layer (Layer 3) of the OSI reference model device meaning it will connect multiple laptop networks via wired or wireless connections. Network router will receive, analyze, perform the traffic directive functions and forwards information packet from one network to its destination node. A router could be a device that forwards packets between networks by process the routing data enclosed within the packet.



Switch
A switch, within the context of networking could be a high-speed device that receives incoming information packets and redirects them to their destination on an area a neighborhood area network (LAN). A LAN switch operates at the info link layer (Layer 2) or the network layer of the OSI Model and, per se it will support all kinds of packet protocols.
Essentially, switches area unit the traffic cops of a straightforward native space network.



Firewall
A firewall will be a hardware or software package device. A hardware firewall may be a unit that's connected between the network and also the device for connecting to the web. A software package firewall may be a program that's put in on the pc with the web association



Bridges
Bridges square measure want to connect 2 or a lot of hosts or network segments along. the fundamental role of bridges in specification is storing and forwarding frames between the various segments that the bridge connects. They use hardware Media Access management (MAC) addresses for transferring frames. By viewing the Mack address of the devices connected to every section, bridges will forward the information or block it from crossing. Bridges may be wont to connect 2 physical local area networks into a bigger logical LAN.



Modem
Modems (modulators-demodulators) area unit want to transmit digital signals over analog phone lines. Thus, digital signals area unit born-again by the electronic equipment into analog signals of various frequencies and transmitted to an electronic equipment at the receiving location. The receiving electronic equipment performs the reverse transformation and provides a digital output to a tool connected to an electronic equipment, typically a laptop. The digital information is typically transferred to or from the electronic equipment over a serial line through AN business customary interface, RS-232. several phone firms supply phone line services, and lots of cable operators use modems as finish terminals for identification and recognition of home and private users. Modems work on each the Physical and link layers.



Load Balance
A hardware load-balancing device (HLD), also known as a layer 4-7 router, is a physical unit that directs computers to individual servers in a network, based on factors such as server processor utilization, the number of connections to a server, or the overall server performance.



Firewall/ Client/ Server network
Firewall
A firewall is a system designed to prevent unauthorized access to or from a private network. You can implement a firewall in either hardware or software form, or a combination of both. Firewalls prevent unauthorized internet users from accessing private networks connected to the internet, especially intranets.



Client
A client is a piece of computer hardware or software that accesses a service made available by a server. The server is often on another computer system, in which case the client accesses the service by way of a network



Server
In computing, a server is a computer program or a device that provides functionality for other programs or devices, called "clients". This architecture is called the client–server model, and a single overall computation is distributed across multiple processes or devices



#08 - Computer Network | #Grade_10 #Unit_02 #Tamil



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Hello, I’m Ramzan Graphics Designer and WEB Developer from Mutur, Trincomalee Sri Lanka.I am owner of Ram Soft Tm. I hold a Pearson BTEC HND in Computing from ESOFT Metro Campus.
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