Friday, 16 December 2011

Network Devices (Medium)

Network Devices

 There are many devices that can be used in a network and they all have different uses.

Your home network will have a router, computer/laptop (host) and other devices such as ipods, xbox, printers etc. These will all be connected to the router via a Ethernet cable or wireless.

Devices on a network explained.

Hubs – A Hub allows different nodes on a network to connect to each other via Ethernet cables or wireless. When one node wants to send a message to another, all the nodes on the network are sent the message and they all ignore it unless it is the node that it was meant to go to. It is inefficient to do it this way when you look at switches…

Fast Hub - A fast Hub connects two hubs together, creating 2 networks out of one.
Fast switch - A fast Switch does exactly the same as a fast hub except for switches.

Switches – Switches are like a Hub but when one node wants to send a message, the switch reads where the message is going to and sends it straight to that node. The other nodes don’t have to ignore the message. This is more efficient than the hub and wont send unnecessary packets.

Bridges – Bridges connect two  localized networks together. A bridge will look at the source address and destination address and decide whether to forward or filter the packet. It will look at a packet and see if it Is going to someone outside the network or someone in your network and if it has authorization.

Repeaters – Repeaters receive a message and repeat it at a higher strength. They do not break up the message, they recreate it and send it on again. The maximum number of repeaters you can use between two nodes is four. You cant use any more than four because there is not enough time to send a confirmation message back before another message is sent.

Routers – Routers are used to connect networks together e.g. the network you have at home ( computer, laptop, games console and IPod etc.) is connected to the Internet via your router (it has to go through the ISP before connecting though) This allows your devices on your network to request information from the Internet. They also filter out any unwanted packets going to your network through a port.

 Servers - Servers are used to manage resources on a network. This includes email servers, ftp (file transfer), web (web hosting), print server etc. 
Servers differ from hosts in that the server focuses on one specific task that you set it up with.

Printers - Devices that allow you to put an image from the computer onto paper or other material depending on what type of printer it is.

 Hosts - The computers on the network that are called hosts or nodes. 

Terminators - These go at the end of a bus network to stop the messages from bouncing back into the network and creating all kinds of problems.

All these devices play a different part. They can all be used together in a network to create a bigger network.

The technical name for the Ethernet cable is called RJ45.
The technical name for the phone line cable which gets plugged into your phone and router is called RJ11.

To sum up.

  • There are many different devices on a network and they all do different tasks.
  • The names of the devices are above, along with their description. ( Google them, learn what they look like and how to distinguish one from the other. I can't upload photos because i have't got any of these devices and copyright laws are crazy).
  • Ethernet cable = RJ45
  • Phone line cable = RJ11
If you have any questions, please comment below.

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