Why is it necessary for the protocol that runs on the network layer to also offer packetizing services to the protocol that runs on the transport layer? Why is it that the segments cannot be sent without the datagram encapsulation that is performed by the transport layer?

Systems Architecture
7th Edition
ISBN:9781305080195
Author:Stephen D. Burd
Publisher:Stephen D. Burd
Chapter9: Computer Networks
Section: Chapter Questions
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Why is it necessary for the protocol that runs on the network layer to also offer packetizing services to the protocol that runs on the transport layer? Why is it that the segments cannot be sent without the datagram encapsulation that is performed by the transport layer?

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