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(Christopher)With packet-switched networks its services allow multiple connections to exist simultaneously over the same physical circuit, like that of a Local Area Network (LAN) or a Backbone Network (BN).  An example of a packet-switched network is the internet, which is based on the TCP/IP protocol suite.  Where a series of routers located at different points on the Internet's backbone transmit each packet received based on its destination address until the packet reaches its destination.  By contrast, circuit-switched networks or dedicated networks require a dedicated path between the source and the destination before the transfer of data can begin.  Additionally, data transmission is guaranteed but by only two devices and it is used primarily for connections that must be continuous for long periods, such as long-distance communication   A good example of a circuit-switched network is a traditional telephone system or landlines (FitzGerald, 2021).

One difference between switched backbone networks and routed backbone network is most organizations place all network devices for one part of the building in the same room located in a rack when using switched backbone architecture.  The advantage of this placement is easy maintenance and upgrade.  Additionally, switched BNs use a star topology with one switch in the center.  By contrast, routed backbones LANs employ their own router, and each router is connected to a core router, which breaks the network into separate subnets.  The LANs in one building is separate from the LANs in other buildings.  Therefore, message traffic stays in one subnet unless needed in other parts of the network.  The advantage of a routed backbone is it segments each part of the network connected to the backbone.  The disadvantage of routed backbones is routers are more expensive and slower than switches and require more management (FitzGerald, 2021). 

 

REFERENCES

FitzGerald, J. D. (2021). Business Data Communications and Networking, Fourteenth Edition. Hoboken: Wiley.