how backbone used to connect various lan and evaluation of net ?
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Answer:
What is a Backbone Network?
The word backbone means the most important part of a system which provides the core support for the rest of the system. Like the backbone of the human body that holds and balances all the body parts together, the same holds true for networks. A backbone network is defined as a network containing a high capacity connectivity infrastructure that forms the main link or backbone to the different parts of the network. The network consists on various LANs, WANs and sub networks. The connectivity may cover a local area within a building or vicinity or may have a global outreach that spans vast geographical areas. The backbone has a capacity that far exceeds that of the individual networks connected to it.
It normally consists of cabling, switches, bridges, routers, and gateways in varying segments. Individual nodes do not connect directly to the backbone but do so through their LANs and ISPs or larger organizational infrastructures.
There are different types of networks. We will now examine the different networks that can be integrated with backbone technology.
Types of Backbone Networks
Serial Backbone
Serial backbone is the most simple of all backbone architecture and consists of two or more connected devices or nodes. They are linked to each other via a single cable in series, connecting to an extension to the network. Figure 1 demonstrates this Serial backbone architecture.
Serial Backbone
Uses
The Serial backbone is rarely used for enterprise level network topologies because of its high susceptibility to faults and system downtime. If a link between routers gets faulty the whole network may get disrupted as there are no alternate data transmission routes. It is rather used in small network setups.
Distributed Backbone
The Distributed backbone network comprises of a hierarchical formation of devices. Devices which are adaptable to multiple connectivity (connect one or more devices) are used to connect devices in hierarchy. Multiple devices are connected to switches for example which forms the intermediary devices connecting to the backbone router and gateway devices seen in Figure 2.
Distributed Backbone
Use
The distributed backbone network, unlike the serial backbone network, is well suited for enterprise wide connectivity. Expanding and troubleshooting the network is simple. Layers of the network are easily added and managed as the case maybe.
Collapsed Backbone
The Collapsed Backbone network makes use of a single but high specification router that serves as the actual backbone or central connection that supports the rest of the network. As the backbone, it is characterized by high computational power to adequately handle the traffic from various networks. With this set up the entire network is dependent on this single router making the network extremely vulnerable. If the router goes down for any reason so does the entire network.
collapse backbone