The Open Systems Interconnection (OSI) Model is a conceptual and logical layout that defines network communication used by systems open to interconnection and communication with other systems. The model is broken into seven subcomponents, or layers, each of which represents a conceptual collection of services provided to the layers above and below...
The advantages of Internet exchange points include:
The physical infrastructure includes one or more high-speed network Ethernet switches. The traffic exchange in an IXP is enabled by the Border Gateway Protocol (BGP). The traffic exchange is managed through a mutual peering agreement conformed to by all ISPs. The ISPs normally specify the routes through the peering relationship. They may choose to route the traffic through their own addresses or addresses of other providers in the network. In some scenarios, the IXP serves as a backup link to allow traffic to pass through in case of a direct link failure.
The operational costs of an IXP are often shared among all the participating ISPs. For sophisticated exchange points, ISPs are charged a monthly or annual fee based on the port type and traffic volume.
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