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Which among the following services is provided by the transport layer?

  1. Recovery from message loss.
  2. End to end delivery of individual messages.
  3. Correct order message delivery.
  4. All of the above.
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Though option (d) is a part of services provided by Transport Layer but I think (b) should be correct answer end to end delivery, Network layer does host to host delivery. Following screenshot is taken from Forozuan's CN book:

Now decide yourself which one is correct answer!

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 Correct order packet delivery is done by Transport Layer [1]

The Network layer is responsible for end-to-end (also named source-to-destination) delivery of individual packets across multiple networks, without guarantees. [2]

Where as:

  • The Transport layer is responsible for end-to-end delivery of entire message. [2]
  • Transport layer Provides end-to-end connectivity,
  • Transport layer allows data to be transferred reliably (for example, with a guarantee that it will be delivered in the same order that it was sent )


 References:

  1. http://www.rhyshaden.com/osi.htm
  2. http://www.techexams.net/forums/network/281-quick-question-layer-defines-end-end-delivery.html
Answer:

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