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You are here: Home Networking Switching & Routing
20 October 2018

Switching & Routing


Routing is the process of selecting paths in a network along which to send network traffic. Routing is performed for many kinds of networks, including the telephone network (Circuit switching), electronic data networks (such as the Internet), and transportation networks. This article is concerned primarily with routing in electronic data networks using packet switching technology. In packet switching networks, routing directs packet forwarding, the transit of logically addressed packets from their source toward their ultimate destination through intermediate nodes, typically hardware devices called routers, bridges, gateways, firewalls, or switches. General-purpose computers can also forward packets and perform routing, though they are not specialized hardware and may suffer from limited performance. The routing process usually directs forwarding on the basis of routing tables which maintain a record of the routes to various network destinations. Thus, constructing routing tables, which are held in the router's memory, is very important for efficient routing. Most routing algorithms use only one network path at a time, but multi-path routing techniques enable the use of multiple alternative paths. Let CaTECH's team of professionals help with all your routing needs.

Store-and-Forward Switching

In telecommunication, a store-and-forward switching center is a message switching center in which a message is accepted from the originating user, i.e., sender, when it is offered, held in a physical storage, and forwarded to the destination user, i.e., receiver, in accordance with the priority placed upon the message by the originating user and the availability of an outgoing channel. A technique commonly used in messaging services where a data transmission is sent from one device to a receiving device but first passes through a "message centre". The message centre is typically a server that is used by the message service to store the transmitted message only until the receiving device can be located, and it then forwards the transmission to the intended recipient and deletes the message from the server. A common type of store-and-forward messaging is that used between mobile phones.

Cut-Through Switching

In computer networking, cut-through switching is a switching method for packet switching systems, wherein the switch starts forwarding a frame before the whole frame has been received, normally as soon as the destination address is processed. This technique reduces latency through the switch, but decreases reliability.

Fragment-Free Switching

Fragment-free is a switch forwarding method. Fragment-free will ensure that enough bytes are read from the source to detect a collision before forwarding. This is only useful if there is a chance of a collision on the source port - so a fully switched network may not benefit from fragment-free in comparison to low latency cut through switching. Frames are forwarded before any checksums can be calculated. Fragment-free switching, also known as runtless switching, is a hybrid of cut-through and store-and-forward switching. Fragment-free switching was developed to solve the late-collision problem. Fragment-free switching is suitable for backbone applications in a congested network, or when connections are allocated to a number of users. The switching device checks the source and destination MAC address of a packet, and sends the packet to the port corresponding to the destination.

More in this category: « LAN / WAN