Basic Network Devices

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The Guy's Computer
Published at : 07 Dec 2020
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Basic Network Devices
So here are few basic device which are used in computer network.

1 Computer
As a network can be established without a computer, It can be in any form from a Personal computer to a programmed device with a small processor in it.

Now computers are of different different types. As you know PC or laptops are basic computer devices which are used in homes for basic or some general purposes.

Other types of computer are Servers which are powerful and serve a particular purpose. Example are File server, mail server and lot more.
And super computers that are used for typical calculation such as weather forecasts, and other complicated tasks.

Now another type of network device is HUB

Basically a hub is a half-duplex device which is used to connect multiple computers in a network. The bad part of it is, that it floods the data in it's network to all it's ports. Other limitations are that it divide it's bandwidth between the connected computer.

Example if a hub have 10 computer connected and it have a bandwidth of 100 MB/sec then each computer will get 10MB/s. In this way the more devices are connected there will be more lag.

Now there are Active Hubs and Passive hub
Now active hub acts as a repeater, that mean it concentrate the received signal and amplify it. However passive hubs are dumb and just do it's flooding.

And now a days HUBs are not used, they are outdated.

SWITCH
A switch is a smart device which is used to connect multiple computers in a network. Now it is an intelligent hub which is able to remember the computer location. It maps it's ports with the mac address of the particular computer connected to it.

It store this data in a CAM table. And refresh it always in few milliseconds. It also have an ability to create VLAN and separate collision domain; that means the 2 computers which are sending and receiving data seemed connected with a single wire.

Thus improving speed and no bandwidth distribution.

Now switch are of two types
1. Un-managed switches: These are automatic and you can't control their function and these switches works on their own. Such type of switches are used in small business.

2. Managed Switches : Managed switches gives control over their functionality. These type of switches are used in Big industries. And you can control the function of the switch like bandwidth on port, VLAN configuration and a lot other thing.

The sub categories are Smart Switches : which basically have a simple web interface to change basic settings and are used in Gigabyte ethernet.

Enterprise Managed Switches : have almost every function configurable. Can modify or copy the network configuration. Also it have it's own Command line access to control everything.

Another type of Basic Network Devices are Routers

These are the devices which are used to connect two different networks. Routers route the packets to it's right destination by reading the Packet header for it's destination IP and then by it's routing table it forward the packet.

It have two types of Routing One is Static in which you need to manually set the rules but it is prone to failures and not used.

And other is Dynamic routing, which find the best route by it's routing protocols. In this way a packet is transferred to right destination.

Now a days router are so smart and complex that they can do a lot more things other than routing only. SOHO routers have their wireless access point, they act as gateway, DHCP server, they have inbuilt firewall and a lot more things.

Modem : Modem stands for modulator-demodulator. And it convert computer signals into analog one so that those signals can be sent over the telephone lines.

Firewall

A fire wall is a Hardware Device or a Software which is used to secure our computer or network. It filters all malicious packets and block them. Also it can work according to a user. People can set their own firewall rules to block or accept a connection.

Software firewalls can be found in Windows PC and hardware firewalls are used in big enterprise Networks.

Patch panel is a device which have same type of ports to increase connections and is used for routing circuits for testing.

So these were the basic network devices.

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