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Bridges and Switches

Written by: Cresencio Daffon Jr. | 15 Apr, 2011 15:47:33
Word Count: 607 words | Viewed: 32705 times

From the link layer comes bridging and switching controlling the flow of data, error transmission handling, opposing logical in favor of addressing physicality, and physical medium access management. The algorithms of accessing the media, handling error, control of the flow, and addressing is primarily the focus of protocols with multiple link layers as these functions as provided by bridges. The Fiber Distributed Data Interface, Token Ring, and Ethernet are examples of protocols of link layer that are widely used.

Keep in mind it is not true that devices like switches and bridges are complicated because the frames are forwarded to its destination, based on the frames information the decisions are forwarded, and frames incoming are analyzed. For instance, each frame has the whole path to the destination like the bridging of source and route. On the other hand, a move toward the destination makes the frames forwarded in situations wherein the bridging is transparent. Both switching and bridging main advantage is the transparent protocol of the upper layer wherein its information testing is not a requirement due to the fact that at the layer link these devices perform its operations. It only comes to say that the protocol of any layer of network can represent fast traffic forwarding. The traffic of networks such as Xerox Network Systems, Internet Protocol/Transmission Control Protocol, Apple Talk, and DECnet is common for a bridge to move.

The fields of Layer 2 is where the frames filtering of bridges is based, like for instance, instead of forwarding, rejection is programmed for a bridge to do for frames generally specific from a network. There are parameters used for bridges filtering task due to the reason that the information of the link layer usually includes the upper-layer protocol reference. For dealing with multicast packets and broadcast that are unnecessary, filters can be helpful, however.

There are different advantages of switches and bridges which are obtained through the division of big networks into units that is self-contained. The devices on segments that are connected will experience traffic reduction through a switch or bridge due to reasons that only some traffic percentage is forwarded. The main purpose of switch or bridge is to establish communication between multiple devices that supports Local Area Network connection and as a firewall for errors of network that have bigger possibilities to cause damage. The Local Area Network length effective is being extended by switches and bridges to permit distant stations attachment that was permitted before.

These technologies are being differentiated by various distinctions even though attributes that are most applicable are shared by switches and bridges. The Local Area Network is divided into a couple of segments that are smaller by bridges, while the Local Area Network thatís larger is split up into smaller portions by switches. The majority of switches have lots of ports for Local Area Network connection; on the other hand, there are only a few for bridges. For a Local Area Network to have various segments of network that is precisely around 24, the catalyst of Cisco have 24 ports which are small switches, while hundreds of ports is obtained by a Cisco Catalyst which are larger switches. Both Ethernet Local Area Network with Megabits per second of 10 and 100, respectively, used switch to be connected, that only indicates why various media can be connected with Local Area Network through switches. The switching of store-and-forward traffic is supported by bridges, while the network delays and latency is reduced by cut-through switching that is supported by some switches. The segments of network collisions are reduced by switches for the bandwidth they primarily provide to an individual segment of network.

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