The service model of the Internet’s network layer is the Best effort service. This service model defines that end to end delivery of packets between source and destination hosts in a network.
The service model includes the guarantees of the network layer are as follows:
• Guaranteed Delivery:
This service does not provide guarantee to the host-to-host delivery of the datagrams.
• Guaranteed delivery with bounded delay:
This service does not provide guarantee to transfer a datagram within a specified host to host delay bound of the datagrams.
• In order packet delivery:
This service does not provide guarantee of the eventual and ordered delivery of the datagrams at the received side. The datagrams can delivery in any order in the host-to-host model.
• Guaranteed minimal bandwidth:
This service does not provide the minimum bandwidth guarantee. Because the transmission time between the datagrams is not maintained.
• Security:
This service does not provide security for the data. Because it may loss some datagrams before it reaches from source to destination.
Hence, the best effort service model in a network layer does not provide guarantee to any of the above services.
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