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Chapter 2. TCP/IP Review > The Host-to-Host Layer

The Host-to-Host Layer

The host-to-host layer of the TCP/IP protocol is aptly named. Whereas the internet layer is responsible for the logical paths between networks, the host-to-host layer is responsible for the full logical path between two hosts on disparate networks[12]. From another viewpoint, the host-to-host layer is an interface to the lower layers of the protocol suite, freeing applications from any concern about how their data is actually being delivered.

[12] Similarly, it can be said that the equivalent functions of the OSI session layer, residing above the transport layer, provide a logical, end-to-end path between two applications across an internetwork.

An analogy to this service is a corporate mailroom. A package may be given to the mailroom with requirements stated for its delivery (general delivery, overnight). The person making the delivery request does not need to know, and is probably not interested in, the actual mechanics of delivering the package. The mailroom people will arrange for the proper service (postal, FedEx, cross-town bicycle courier) to fulfill the delivery requirements.


  

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