Tuesday, December 18, 2012

Network Infrastructure Devices

        Network Infrastructure Devices 


Hub


Hubs were the common network infrastructure devices used for LAN connectivity but switches are rapidly replacing hubs. Hubs function as the central connection point for LANs. Hubs are designed to work with Twisted pair cabling and normally use RJ45 jack to connect the devices. Network devices (Servers, Workstations, Printers, Scanners etc) are attached to the hub by individual network cables. Hubs usually come in different shapes and different numbers of ports.

When a hub receives a packet of data (an Ethernet frame) at one of its ports from a network device, it transmits (repeats) the packet to all of its ports to all of the other network devices.  If two network devices on the same network try to send packets at the same time a collision is said to occur.


 Bridges and Switchs


A bridge is a network device that operates at the Data Link layer (Layer 2) of OSI model. There are many different types of bridges and include Transparent bridges, Encapsulation bridges, Source-route bridges. Source-route bridges are for Token Ring network. Bridges allow segmenting a Local Network into multiple segments, thus reducing the network traffic. A bridge performs the segmenting function by examining the Data Link Layer (Layer 2) data packet (Ethernet Frame) and forwarding the packet to other physical segments only if necessary. Both swiches and bridges function using Data Link Layer (Layer 2) addressing system, also known as MAC addresses.
Bridge can connect only a few Networks, LANs or Hosts. A Bridge has comparatively less ports than a Switch. A Switch has usually 24 ports or 48 ports. Brides and Switches are considered to operate at Data Link Layer (Layer 2) of OSI model.





Router

A router is another network infrastructure device that directs packets through the network based on information from Network Layer (Layer 3) of OSI model. A router uses a combination of hardware and software to "route" data from its source to its destination. A router can be configured to route data packets from different network protocols, like TCP/IP, IPX/SPX, and AppleTalk.

Routers segment large networks into logical segments called subnets. The division of the network is based on the Layer 3 addressing system, like IP addresses. If the Network Layer (Layer 3) Data packet (IP Datagram) is addressed to another device on the local subnet, the packet does not cross the router and create a traffic congestion problem in another network. If data is addressed to a computer outside the subnet, the router forwards the data to the addressed network. Thus routing of network data helps conserve network bandwidth.





14 comments:

  1. Hi,I got a nice idea about Network Infrastructure Devices.Thanks...

    -Aparna
    Theosoft

    ReplyDelete
  2. nice article about hardware networking device. thanks for sharing WAN Optimization

    ReplyDelete
  3. It is extremely interesting for me to read the article. Thank you for it. I like such topics and everything connected to them. I would like to read a bit more on that blog soon.
    10G tcp offload
    Thanks...

    ReplyDelete
  4. My dad works with computer, networks, and related things. Ha has tried explaining their functions a couple of times, but he keeps using technical terms that normal people really don't understand. I try to get him to dumb it down, but that isn't one of his strength.
    http://www.cccmd.com/business-it-support/

    ReplyDelete
  5. Shard Global Ltd offers IP Camera Installation in UK and intelligent security solutions that enable a smarter, safer world. As the global market leader in network video, Axis is driving the industry by continually launching innovative network products based on an open platform - delivering high value to customers through a global partner network.



    With UK Phone Systems, you get the most advanced and fully featured phone system in the industry. It is a system that is ultra-reliable and supported by a highly trained staff located right here in the UK, a system that will save you money and enable you to focus on your business.




    ReplyDelete
  6. Graphic Design Software for Mac Graphic Design Software on Mac OS X like Corel Painter, Illustrator CS6, MyBrushes are those Best Graphic Design Software for Mac OS X.

    ReplyDelete
  7. Your website is terribly informative and your articles are wonderful.
    My pleasure, Good luck with your blog Visit: Computer Networking

    ReplyDelete
  8. Wonderful blog for AWS which I have seen and it's absolutely great stuff on AWS Topics. Thanks for such a cool blog about AWS topics. Very good explanation on AWS concepts we do AWS Training in Chennai.
    Regards,
    AWS Training Institutes in Chennai | Best AWS Training in Chennai

    ReplyDelete
  9. It is great to see such a piece of helpful information and thanks for sharing it.Crane Limit Switchs

    ReplyDelete
  10. Thanks for nice information about cranes. Your blog focuses on every detailed aspects which boosted my knowledge regarding cranes.
    Crane Limit Switchs

    ReplyDelete
  11. Thanks for sharing such a useful post regarding installation of data cabling. Keep on sharing more of these. It also is a great to see such a piece of helpful information

    ReplyDelete
  12. Thanks for sharing such a useful post regarding security products distributors. Keep on sharing more of these. It also is a great to see such a piece of helpful information

    ReplyDelete