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Why is it necessary for the network layer protocol to offer packetizing services to the transport layer? Why can't the segments be provided without datagrams if they are required for transit?

Principles of Information Security (MindTap Course List)

6th Edition

ISBN:9781337102063

Author:Michael E. Whitman, Herbert J. Mattord

Publisher:Michael E. Whitman, Herbert J. Mattord

Chapter6: Security Technology: Access Controls, Firewalls, And Vpns

Section: Chapter Questions

Problem 2RQ

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Why is it necessary for the network layer protocol to offer packetizing services to the transport layer? Why can't the segments be provided without datagrams if they are required for transit?

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What use does it serve for a protocol operating at the network layer to provide packetizing services to the transport layer? If the segments don't need to be encapsulated in datagrams before being delivered, then why does the transport layer have to do so?
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